Merge tag 'for-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply

Pull power supply and reset updates from Sebastian Reichel:

 - new maintenance charging documentation

 - mt6370: new charger driver

 - bq25890: support input current limit

 - added Qualcomm PMK8350 PON support

 - misc minor fixes

* tag 'for-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply: (22 commits)
  power: supply: ab8500: remove unused static local variable
  power: supply: mt6370: Fix return value check in mt6370_chg_probe()
  power: supply: ab8500: Remove unused struct ab8500_chargalg_sysfs_entry
  power: supply: mt6370: uses IIO interfaces, depends on IIO
  power: supply: max1721x: Fix spelling mistake "Gauage" -> "Gauge"
  power: supply: mt6370: Add MediaTek MT6370 charger driver
  dt-bindings: power: supply: Add MediaTek MT6370 Charger
  lib: add linear range index macro
  power: supply: bq25890: Fix enum conversion in bq25890_power_supply_set_property()
  power: supply: bq27xxx: fix NULL vs 0 warnings
  power: supply: bq27xxx: fix __be16 warnings
  power: supply: bq25890: Add support for setting IINLIM
  power: supply: bq25890: Disable PUMPX_EN on errors
  power: supply: Fix repeated word in comments
  power: supply: adp5061: show unknown capacity_level as text
  power: supply: adp5061: fix out-of-bounds read in adp5061_get_chg_type()
  power: supply: tps65217: Fix comments typo
  power: reset: qcom-pon: add support for qcom,pmk8350-pon compatible string
  dt-bindings: power: reset: qcom-pon: Add new compatible "qcom,pmk8350-pon"
  power: supply: cw2015: Use device managed API to simplify the code
  ...

17 files changed, 1246 insertions, 65 deletions

diff --git a/Documentation/devicetree/bindings/power/reset/qcom,pon.yaml b/Documentation/devicetree/bindings/power/reset/qcom,pon.yaml
index e7b436d2e757f1..d96170eecbd228 100644
--- a/Documentation/devicetree/bindings/power/reset/qcom,pon.yaml
+++ b/Documentation/devicetree/bindings/power/reset/qcom,pon.yaml
@@ -15,18 +15,27 @@ description: |
 
   This DT node has pwrkey and resin as sub nodes.
 
-allOf:
-  - $ref: reboot-mode.yaml#
-
 properties:
   compatible:
     enum:
       - qcom,pm8916-pon
       - qcom,pms405-pon
       - qcom,pm8998-pon
+      - qcom,pmk8350-pon
 
   reg:
-    maxItems: 1
+    description: |
+      Specifies the SPMI base address for the PON (power-on) peripheral.  For
+      PMICs that have the PON peripheral (GEN3) split into PON_HLOS and PON_PBS
+      (e.g. PMK8350), this can hold addresses of both PON_HLOS and PON_PBS
+      peripherals.  In that case, the PON_PBS address needs to be specified to
+      facilitate software debouncing on some PMIC.
+    minItems: 1
+    maxItems: 2
+
+  reg-names:
+    minItems: 1
+    maxItems: 2
 
   pwrkey:
     type: object
@@ -46,6 +55,39 @@ required:
 
 unevaluatedProperties: false
 
+allOf:
+  - $ref: reboot-mode.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,pm8916-pon
+              - qcom,pms405-pon
+              - qcom,pm8998-pon
+    then:
+      properties:
+        reg:
+          maxItems: 1
+        reg-names:
+          items:
+            - const: pon
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: qcom,pmk8350-pon
+    then:
+      properties:
+        reg:
+          minItems: 1
+          maxItems: 2
+        reg-names:
+          minItems: 1
+          items:
+            - const: hlos
+            - const: pbs
+
 examples:
   - |
    #include <dt-bindings/interrupt-controller/irq.h>
diff --git a/Documentation/devicetree/bindings/power/supply/mediatek,mt6370-charger.yaml b/Documentation/devicetree/bindings/power/supply/mediatek,mt6370-charger.yaml
new file mode 100644
index 00000000000000..fd491c598a0050
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/supply/mediatek,mt6370-charger.yaml
@@ -0,0 +1,96 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/supply/mediatek,mt6370-charger.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek MT6370 Battery Charger
+
+maintainers:
+  - ChiaEn Wu <chiaen_wu@richtek.com>
+
+description: |
+  This module is part of the MT6370 MFD device.
+  Provides Battery Charger, Boost for OTG devices and BC1.2 detection.
+
+properties:
+  compatible:
+    const: mediatek,mt6370-charger
+
+  interrupts:
+    description: |
+      Specify what irqs are needed to be handled by MT6370 Charger driver.
+      We need to use the IRQ "MT6370_IRQ_OVPCTRL_UVP_D" to know when USB
+      is plugged in, and then the driver will enable BC1.2 detection.
+      After the hardware of MT6370 completes the BC1.2 detection,
+      IRQ "MT6370_IRQ_ATTACH" will be triggered, and the driver will know
+      the result of BC1.2 detection.
+      When the IRQ "MT6370_IRQ_CHG_MIVR" is triggered, it means that the
+      hardware enters the "Minimum Input Voltage Regulation loop" and
+      a workaround needs to be applied at this time.
+      In summary, "MT6370_IRQ_OVPCTRL_UVP_D", "MT6370_IRQ_ATTACH" and
+      "MT6370_IRQ_CHG_MIVR" are required in this charger driver.
+    items:
+      - description: irq of "USB is plugged in"
+      - description: irq of "BC1.2 is done"
+      - description: irq of "Minimum Input Voltage Regulation loop is active"
+
+  interrupt-names:
+    items:
+      - const: uvp_d_evt
+      - const: attach_i
+      - const: mivr
+
+  io-channels:
+    description: |
+      Use ADC channel to read VBUS, IBUS, IBAT, etc., info.
+    minItems: 1
+    items:
+      - description: |
+          VBUS voltage with lower accuracy (+-75mV) but higher measure
+          range (1~22V)
+      - description: |
+          VBUS voltage with higher accuracy (+-30mV) but lower measure
+          range (1~9.76V)
+      - description: the main system input voltage
+      - description: battery voltage
+      - description: battery temperature-sense input voltage
+      - description: IBUS current (required)
+      - description: battery current
+      - description: |
+          regulated output voltage to supply for the PWM low-side gate driver
+          and the bootstrap capacitor
+      - description: IC junction temperature
+
+  io-channel-names:
+    minItems: 1
+    items:
+      - const: vbusdiv5
+      - const: vbusdiv2
+      - const: vsys
+      - const: vbat
+      - const: ts_bat
+      - const: ibus
+      - const: ibat
+      - const: chg_vddp
+      - const: temp_jc
+
+  usb-otg-vbus-regulator:
+    type: object
+    description: OTG boost regulator.
+    unevaluatedProperties: false
+    $ref: /schemas/regulator/regulator.yaml#
+
+    properties:
+      enable-gpios:
+        maxItems: 1
+
+required:
+  - compatible
+  - interrupts
+  - interrupt-names
+  - io-channels
+
+additionalProperties: false
+
+...
diff --git a/drivers/power/reset/qcom-pon.c b/drivers/power/reset/qcom-pon.c
index 4a688741a88a4d..16bc01738be953 100644
--- a/drivers/power/reset/qcom-pon.c
+++ b/drivers/power/reset/qcom-pon.c
@@ -82,6 +82,7 @@ static const struct of_device_id pm8916_pon_id_table[] = {
 	{ .compatible = "qcom,pm8916-pon", .data = (void *)GEN1_REASON_SHIFT },
 	{ .compatible = "qcom,pms405-pon", .data = (void *)GEN1_REASON_SHIFT },
 	{ .compatible = "qcom,pm8998-pon", .data = (void *)GEN2_REASON_SHIFT },
+	{ .compatible = "qcom,pmk8350-pon", .data = (void *)GEN2_REASON_SHIFT },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, pm8916_pon_id_table);
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 56e70a68679a6a..0bbfe6a7ce4d2b 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -619,6 +619,21 @@ config CHARGER_MT6360
 	  Average Input Current Regulation, Battery Temperature Sensing,
 	  Over-Temperature Protection, DPDM Detection for BC1.2.
 
+config CHARGER_MT6370
+	tristate "MediaTek MT6370 Charger Driver"
+	depends on MFD_MT6370
+	depends on REGULATOR
+	depends on IIO
+	select LINEAR_RANGES
+	help
+	  Say Y here to enable MT6370 Charger Part.
+	  The device supports High-Accuracy Voltage/Current Regulation,
+	  Average Input Current Regulation, Battery Temperature Sensing,
+	  Over-Temperature Protection, DPDM Detection for BC1.2.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called "mt6370-charger".
+
 config CHARGER_QCOM_SMBB
 	tristate "Qualcomm Switch-Mode Battery Charger and Boost"
 	depends on MFD_SPMI_PMIC || COMPILE_TEST
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 3040a1de81b8d7..0ee8653e882e7a 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -82,6 +82,7 @@ obj-$(CONFIG_CHARGER_MAX8997)	+= max8997_charger.o
 obj-$(CONFIG_CHARGER_MAX8998)	+= max8998_charger.o
 obj-$(CONFIG_CHARGER_MP2629)	+= mp2629_charger.o
 obj-$(CONFIG_CHARGER_MT6360)	+= mt6360_charger.o
+obj-$(CONFIG_CHARGER_MT6370)	+= mt6370-charger.o
 obj-$(CONFIG_CHARGER_QCOM_SMBB)	+= qcom_smbb.o
 obj-$(CONFIG_CHARGER_BQ2415X)	+= bq2415x_charger.o
 obj-$(CONFIG_CHARGER_BQ24190)	+= bq24190_charger.o
diff --git a/drivers/power/supply/ab8500_chargalg.c b/drivers/power/supply/ab8500_chargalg.c
index ae4be553f4248b..ea4ad61d4c7e2e 100644
--- a/drivers/power/supply/ab8500_chargalg.c
+++ b/drivers/power/supply/ab8500_chargalg.c
@@ -252,12 +252,6 @@ static enum power_supply_property ab8500_chargalg_props[] = {
 	POWER_SUPPLY_PROP_HEALTH,
 };
 
-struct ab8500_chargalg_sysfs_entry {
-	struct attribute attr;
-	ssize_t (*show)(struct ab8500_chargalg *di, char *buf);
-	ssize_t (*store)(struct ab8500_chargalg *di, const char *buf, size_t length);
-};
-
 /**
  * ab8500_chargalg_safety_timer_expired() - Expiration of the safety timer
  * @timer:     pointer to the hrtimer structure
@@ -490,8 +484,6 @@ static int ab8500_chargalg_kick_watchdog(struct ab8500_chargalg *di)
 static int ab8500_chargalg_ac_en(struct ab8500_chargalg *di, int enable,
 	int vset_uv, int iset_ua)
 {
-	static int ab8500_chargalg_ex_ac_enable_toggle;
-
 	if (!di->ac_chg || !di->ac_chg->ops.enable)
 		return -ENXIO;
 
diff --git a/drivers/power/supply/adp5061.c b/drivers/power/supply/adp5061.c
index 003557043ab3af..fcf8ff0bc974b8 100644
--- a/drivers/power/supply/adp5061.c
+++ b/drivers/power/supply/adp5061.c
@@ -427,11 +427,11 @@ static int adp5061_get_chg_type(struct adp5061_state *st,
 	if (ret < 0)
 		return ret;
 
-	chg_type = adp5061_chg_type[ADP5061_CHG_STATUS_1_CHG_STATUS(status1)];
-	if (chg_type > ADP5061_CHG_FAST_CV)
+	chg_type = ADP5061_CHG_STATUS_1_CHG_STATUS(status1);
+	if (chg_type >= ARRAY_SIZE(adp5061_chg_type))
 		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 	else
-		val->intval = chg_type;
+		val->intval = adp5061_chg_type[chg_type];
 
 	return ret;
 }
@@ -493,6 +493,9 @@ static int adp5061_get_battery_status(struct adp5061_state *st,
 	case 0x4: /* VBAT_SNS > VWEAK */
 		val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 		break;
+	default:
+		val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
+		break;
 	}
 
 	return ret;
diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
index 06ea7399d1516c..6020b58c641d23 100644
--- a/drivers/power/supply/bq25890_charger.c
+++ b/drivers/power/supply/bq25890_charger.c
@@ -613,6 +613,33 @@ static int bq25890_power_supply_get_property(struct power_supply *psy,
 	return 0;
 }
 
+static int bq25890_power_supply_set_property(struct power_supply *psy,
+					     enum power_supply_property psp,
+					     const union power_supply_propval *val)
+{
+	struct bq25890_device *bq = power_supply_get_drvdata(psy);
+	u8 lval;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		lval = bq25890_find_idx(val->intval, TBL_IINLIM);
+		return bq25890_field_write(bq, F_IINLIM, lval);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int bq25890_power_supply_property_is_writeable(struct power_supply *psy,
+						      enum power_supply_property psp)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		return true;
+	default:
+		return false;
+	}
+}
+
 /* On the BQ25892 try to get charger-type info from our supplier */
 static void bq25890_charger_external_power_changed(struct power_supply *psy)
 {
@@ -874,6 +901,8 @@ static const struct power_supply_desc bq25890_power_supply_desc = {
 	.properties = bq25890_power_supply_props,
 	.num_properties = ARRAY_SIZE(bq25890_power_supply_props),
 	.get_property = bq25890_power_supply_get_property,
+	.set_property = bq25890_power_supply_set_property,
+	.property_is_writeable = bq25890_power_supply_property_is_writeable,
 	.external_power_changed	= bq25890_charger_external_power_changed,
 };
 
@@ -946,6 +975,7 @@ static void bq25890_pump_express_work(struct work_struct *data)
 
 	return;
 error_print:
+	bq25890_field_write(bq, F_PUMPX_EN, 0);
 	dev_err(bq->dev, "Failed to request hi-voltage charging\n");
 }
 
diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c
index 35e6a394c0df34..8bf048fbd36a2f 100644
--- a/drivers/power/supply/bq27xxx_battery.c
+++ b/drivers/power/supply/bq27xxx_battery.c
@@ -868,11 +868,11 @@ enum bq27xxx_dm_reg_id {
 	BQ27XXX_DM_TERMINATE_VOLTAGE,
 };
 
-#define bq27000_dm_regs 0
-#define bq27010_dm_regs 0
-#define bq2750x_dm_regs 0
-#define bq2751x_dm_regs 0
-#define bq2752x_dm_regs 0
+#define bq27000_dm_regs NULL
+#define bq27010_dm_regs NULL
+#define bq2750x_dm_regs NULL
+#define bq2751x_dm_regs NULL
+#define bq2752x_dm_regs NULL
 
 #if 0 /* not yet tested */
 static struct bq27xxx_dm_reg bq27500_dm_regs[] = {
@@ -881,24 +881,24 @@ static struct bq27xxx_dm_reg bq27500_dm_regs[] = {
 	[BQ27XXX_DM_TERMINATE_VOLTAGE] = { 80, 48, 2, 1000, 32767 },
 };
 #else
-#define bq27500_dm_regs 0
+#define bq27500_dm_regs NULL
 #endif
 
 /* todo create data memory definitions from datasheets and test on chips */
-#define bq27510g1_dm_regs 0
-#define bq27510g2_dm_regs 0
-#define bq27510g3_dm_regs 0
-#define bq27520g1_dm_regs 0
-#define bq27520g2_dm_regs 0
-#define bq27520g3_dm_regs 0
-#define bq27520g4_dm_regs 0
-#define bq27521_dm_regs 0
-#define bq27530_dm_regs 0
-#define bq27531_dm_regs 0
-#define bq27541_dm_regs 0
-#define bq27542_dm_regs 0
-#define bq27546_dm_regs 0
-#define bq27742_dm_regs 0
+#define bq27510g1_dm_regs NULL
+#define bq27510g2_dm_regs NULL
+#define bq27510g3_dm_regs NULL
+#define bq27520g1_dm_regs NULL
+#define bq27520g2_dm_regs NULL
+#define bq27520g3_dm_regs NULL
+#define bq27520g4_dm_regs NULL
+#define bq27521_dm_regs NULL
+#define bq27530_dm_regs NULL
+#define bq27531_dm_regs NULL
+#define bq27541_dm_regs NULL
+#define bq27542_dm_regs NULL
+#define bq27546_dm_regs NULL
+#define bq27742_dm_regs NULL
 
 #if 0 /* not yet tested */
 static struct bq27xxx_dm_reg bq27545_dm_regs[] = {
@@ -907,7 +907,7 @@ static struct bq27xxx_dm_reg bq27545_dm_regs[] = {
 	[BQ27XXX_DM_TERMINATE_VOLTAGE] = { 80, 67, 2, 2800,  3700 },
 };
 #else
-#define bq27545_dm_regs 0
+#define bq27545_dm_regs NULL
 #endif
 
 static struct bq27xxx_dm_reg bq27411_dm_regs[] = {
@@ -937,7 +937,7 @@ static struct bq27xxx_dm_reg bq27426_dm_regs[] = {
 #if 0 /* not yet tested */
 #define bq27441_dm_regs bq27421_dm_regs
 #else
-#define bq27441_dm_regs 0
+#define bq27441_dm_regs NULL
 #endif
 
 #if 0 /* not yet tested */
@@ -947,13 +947,13 @@ static struct bq27xxx_dm_reg bq27621_dm_regs[] = {
 	[BQ27XXX_DM_TERMINATE_VOLTAGE] = { 82, 9, 2, 2500,  3700 },
 };
 #else
-#define bq27621_dm_regs 0
+#define bq27621_dm_regs NULL
 #endif
 
-#define bq27z561_dm_regs 0
-#define bq28z610_dm_regs 0
-#define bq34z100_dm_regs 0
-#define bq78z100_dm_regs 0
+#define bq27z561_dm_regs NULL
+#define bq28z610_dm_regs NULL
+#define bq34z100_dm_regs NULL
+#define bq78z100_dm_regs NULL
 
 #define BQ27XXX_O_ZERO		BIT(0)
 #define BQ27XXX_O_OTDC		BIT(1) /* has OTC/OTD overtemperature flags */
@@ -1044,12 +1044,12 @@ struct bq27xxx_dm_buf {
 	.block = (di)->dm_regs[i].offset / BQ27XXX_DM_SZ, \
 }
 
-static inline u16 *bq27xxx_dm_reg_ptr(struct bq27xxx_dm_buf *buf,
+static inline __be16 *bq27xxx_dm_reg_ptr(struct bq27xxx_dm_buf *buf,
 				      struct bq27xxx_dm_reg *reg)
 {
 	if (buf->class == reg->subclass_id &&
 	    buf->block == reg->offset / BQ27XXX_DM_SZ)
-		return (u16 *) (buf->data + reg->offset % BQ27XXX_DM_SZ);
+		return (__be16 *) (buf->data + reg->offset % BQ27XXX_DM_SZ);
 
 	return NULL;
 }
@@ -1275,7 +1275,7 @@ static void bq27xxx_battery_update_dm_block(struct bq27xxx_device_info *di,
 {
 	struct bq27xxx_dm_reg *reg = &di->dm_regs[reg_id];
 	const char *str = bq27xxx_dm_reg_name[reg_id];
-	u16 *prev = bq27xxx_dm_reg_ptr(buf, reg);
+	__be16 *prev = bq27xxx_dm_reg_ptr(buf, reg);
 
 	if (prev == NULL) {
 		dev_warn(di->dev, "buffer does not match %s dm spec\n", str);
diff --git a/drivers/power/supply/cpcap-charger.c b/drivers/power/supply/cpcap-charger.c
index 60e0ce105a2954..be9764541d52a5 100644
--- a/drivers/power/supply/cpcap-charger.c
+++ b/drivers/power/supply/cpcap-charger.c
@@ -5,7 +5,7 @@
  * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
  *
  * Rewritten for Linux power framework with some parts based on
- * on earlier driver found in the Motorola Linux kernel:
+ * earlier driver found in the Motorola Linux kernel:
  *
  * Copyright (C) 2009-2010 Motorola, Inc.
  */
diff --git a/drivers/power/supply/cw2015_battery.c b/drivers/power/supply/cw2015_battery.c
index 81e17ad8016329..6d52641151d9ac 100644
--- a/drivers/power/supply/cw2015_battery.c
+++ b/drivers/power/supply/cw2015_battery.c
@@ -21,6 +21,7 @@
 #include <linux/regmap.h>
 #include <linux/time.h>
 #include <linux/workqueue.h>
+#include <linux/devm-helpers.h>
 
 #define CW2015_SIZE_BATINFO		64
 
@@ -698,7 +699,8 @@ static int cw_bat_probe(struct i2c_client *client)
 	}
 
 	cw_bat->battery_workqueue = create_singlethread_workqueue("rk_battery");
-	INIT_DELAYED_WORK(&cw_bat->battery_delay_work, cw_bat_work);
+	devm_delayed_work_autocancel(&client->dev,
+							  &cw_bat->battery_delay_work, cw_bat_work);
 	queue_delayed_work(cw_bat->battery_workqueue,
 			   &cw_bat->battery_delay_work, msecs_to_jiffies(10));
 	return 0;
@@ -725,14 +727,6 @@ static int __maybe_unused cw_bat_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(cw_bat_pm_ops, cw_bat_suspend, cw_bat_resume);
 
-static void cw_bat_remove(struct i2c_client *client)
-{
-	struct cw_battery *cw_bat = i2c_get_clientdata(client);
-
-	cancel_delayed_work_sync(&cw_bat->battery_delay_work);
-	power_supply_put_battery_info(cw_bat->rk_bat, cw_bat->battery);
-}
-
 static const struct i2c_device_id cw_bat_id_table[] = {
 	{ "cw2015", 0 },
 	{ }
@@ -751,7 +745,6 @@ static struct i2c_driver cw_bat_driver = {
 		.pm = &cw_bat_pm_ops,
 	},
 	.probe_new = cw_bat_probe,
-	.remove = cw_bat_remove,
 	.id_table = cw_bat_id_table,
 };
 
diff --git a/drivers/power/supply/max1721x_battery.c b/drivers/power/supply/max1721x_battery.c
index 473e53cd280105..d8d52e09da7bea 100644
--- a/drivers/power/supply/max1721x_battery.c
+++ b/drivers/power/supply/max1721x_battery.c
@@ -444,5 +444,5 @@ module_w1_family(w1_max1721x_family);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Alex A. Mihaylov <minimumlaw@rambler.ru>");
-MODULE_DESCRIPTION("Maxim MAX17211/MAX17215 Fuel Gauage IC driver");
+MODULE_DESCRIPTION("Maxim MAX17211/MAX17215 Fuel Gauge IC driver");
 MODULE_ALIAS("w1-family-" __stringify(W1_MAX1721X_FAMILY_ID));
diff --git a/drivers/power/supply/mt6370-charger.c b/drivers/power/supply/mt6370-charger.c
new file mode 100644
index 00000000000000..f27dae5043f5b4
--- /dev/null
+++ b/drivers/power/supply/mt6370-charger.c
@@ -0,0 +1,961 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022 Richtek Technology Corp.
+ *
+ * Author: ChiaEn Wu <chiaen_wu@richtek.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/devm-helpers.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/consumer.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/linear_range.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/workqueue.h>
+
+#define MT6370_REG_CHG_CTRL1		0x111
+#define MT6370_REG_CHG_CTRL2		0x112
+#define MT6370_REG_CHG_CTRL3		0x113
+#define MT6370_REG_CHG_CTRL4		0x114
+#define MT6370_REG_CHG_CTRL5		0x115
+#define MT6370_REG_CHG_CTRL6		0x116
+#define MT6370_REG_CHG_CTRL7		0x117
+#define MT6370_REG_CHG_CTRL8		0x118
+#define MT6370_REG_CHG_CTRL9		0x119
+#define MT6370_REG_CHG_CTRL10		0x11A
+#define MT6370_REG_DEVICE_TYPE		0x122
+#define MT6370_REG_USB_STATUS1		0x127
+#define MT6370_REG_CHG_STAT		0x14A
+#define MT6370_REG_FLED_EN		0x17E
+#define MT6370_REG_CHG_STAT1		0X1D0
+#define MT6370_REG_OVPCTRL_STAT		0x1D8
+
+#define MT6370_VOBST_MASK		GENMASK(7, 2)
+#define MT6370_OTG_PIN_EN_MASK		BIT(1)
+#define MT6370_OPA_MODE_MASK		BIT(0)
+#define MT6370_OTG_OC_MASK		GENMASK(2, 0)
+
+#define MT6370_MIVR_IBUS_TH_100_mA	100000
+#define MT6370_ADC_CHAN_IBUS		5
+#define MT6370_ADC_CHAN_MAX		9
+
+enum mt6370_chg_reg_field {
+	/* MT6370_REG_CHG_CTRL2 */
+	F_IINLMTSEL, F_CFO_EN, F_CHG_EN,
+	/* MT6370_REG_CHG_CTRL3 */
+	F_IAICR, F_AICR_EN, F_ILIM_EN,
+	/* MT6370_REG_CHG_CTRL4 */
+	F_VOREG,
+	/* MT6370_REG_CHG_CTRL6 */
+	F_VMIVR,
+	/* MT6370_REG_CHG_CTRL7 */
+	F_ICHG,
+	/* MT6370_REG_CHG_CTRL8 */
+	F_IPREC,
+	/* MT6370_REG_CHG_CTRL9 */
+	F_IEOC,
+	/* MT6370_REG_DEVICE_TYPE */
+	F_USBCHGEN,
+	/* MT6370_REG_USB_STATUS1 */
+	F_USB_STAT, F_CHGDET,
+	/* MT6370_REG_CHG_STAT */
+	F_CHG_STAT, F_BOOST_STAT, F_VBAT_LVL,
+	/* MT6370_REG_FLED_EN */
+	F_FL_STROBE,
+	/* MT6370_REG_CHG_STAT1 */
+	F_CHG_MIVR_STAT,
+	/* MT6370_REG_OVPCTRL_STAT */
+	F_UVP_D_STAT,
+	F_MAX
+};
+
+enum mt6370_irq {
+	MT6370_IRQ_ATTACH_I = 0,
+	MT6370_IRQ_UVP_D_EVT,
+	MT6370_IRQ_MIVR,
+	MT6370_IRQ_MAX
+};
+
+struct mt6370_priv {
+	struct device *dev;
+	struct iio_channel *iio_adcs;
+	struct mutex attach_lock;
+	struct power_supply *psy;
+	struct regmap *regmap;
+	struct regmap_field *rmap_fields[F_MAX];
+	struct regulator_dev *rdev;
+	struct workqueue_struct *wq;
+	struct work_struct bc12_work;
+	struct delayed_work mivr_dwork;
+	unsigned int irq_nums[MT6370_IRQ_MAX];
+	int attach;
+	int psy_usb_type;
+	bool pwr_rdy;
+};
+
+enum mt6370_usb_status {
+	MT6370_USB_STAT_NO_VBUS = 0,
+	MT6370_USB_STAT_VBUS_FLOW_IS_UNDER_GOING,
+	MT6370_USB_STAT_SDP,
+	MT6370_USB_STAT_SDP_NSTD,
+	MT6370_USB_STAT_DCP,
+	MT6370_USB_STAT_CDP,
+	MT6370_USB_STAT_MAX
+};
+
+struct mt6370_chg_field {
+	const char *name;
+	const struct linear_range *range;
+	struct reg_field field;
+};
+
+enum {
+	MT6370_RANGE_F_IAICR = 0,
+	MT6370_RANGE_F_VOREG,
+	MT6370_RANGE_F_VMIVR,
+	MT6370_RANGE_F_ICHG,
+	MT6370_RANGE_F_IPREC,
+	MT6370_RANGE_F_IEOC,
+	MT6370_RANGE_F_MAX
+};
+
+static const struct linear_range mt6370_chg_ranges[MT6370_RANGE_F_MAX] = {
+	LINEAR_RANGE_IDX(MT6370_RANGE_F_IAICR, 100000, 0x0, 0x3F, 50000),
+	LINEAR_RANGE_IDX(MT6370_RANGE_F_VOREG, 3900000, 0x0, 0x51, 10000),
+	LINEAR_RANGE_IDX(MT6370_RANGE_F_VMIVR, 3900000, 0x0, 0x5F, 100000),
+	LINEAR_RANGE_IDX(MT6370_RANGE_F_ICHG, 900000, 0x08, 0x31, 100000),
+	LINEAR_RANGE_IDX(MT6370_RANGE_F_IPREC, 100000, 0x0, 0x0F, 50000),
+	LINEAR_RANGE_IDX(MT6370_RANGE_F_IEOC, 100000, 0x0, 0x0F, 50000),
+};
+
+#define MT6370_CHG_FIELD(_fd, _reg, _lsb, _msb)				\
+[_fd] = {								\
+	.name = #_fd,							\
+	.range = NULL,							\
+	.field = REG_FIELD(_reg, _lsb, _msb),				\
+}
+
+#define MT6370_CHG_FIELD_RANGE(_fd, _reg, _lsb, _msb)			\
+[_fd] = {								\
+	.name = #_fd,							\
+	.range = &mt6370_chg_ranges[MT6370_RANGE_##_fd],		\
+	.field = REG_FIELD(_reg, _lsb, _msb),				\
+}
+
+static const struct mt6370_chg_field mt6370_chg_fields[F_MAX] = {
+	MT6370_CHG_FIELD(F_IINLMTSEL, MT6370_REG_CHG_CTRL2, 2, 3),
+	MT6370_CHG_FIELD(F_CFO_EN, MT6370_REG_CHG_CTRL2, 1, 1),
+	MT6370_CHG_FIELD(F_CHG_EN, MT6370_REG_CHG_CTRL2, 0, 0),
+	MT6370_CHG_FIELD_RANGE(F_IAICR, MT6370_REG_CHG_CTRL3, 2, 7),
+	MT6370_CHG_FIELD(F_AICR_EN, MT6370_REG_CHG_CTRL3, 1, 1),
+	MT6370_CHG_FIELD(F_ILIM_EN, MT6370_REG_CHG_CTRL3, 0, 0),
+	MT6370_CHG_FIELD_RANGE(F_VOREG, MT6370_REG_CHG_CTRL4, 1, 7),
+	MT6370_CHG_FIELD_RANGE(F_VMIVR, MT6370_REG_CHG_CTRL6, 1, 7),
+	MT6370_CHG_FIELD_RANGE(F_ICHG, MT6370_REG_CHG_CTRL7, 2, 7),
+	MT6370_CHG_FIELD_RANGE(F_IPREC, MT6370_REG_CHG_CTRL8, 0, 3),
+	MT6370_CHG_FIELD_RANGE(F_IEOC, MT6370_REG_CHG_CTRL9, 4, 7),
+	MT6370_CHG_FIELD(F_USBCHGEN, MT6370_REG_DEVICE_TYPE, 7, 7),
+	MT6370_CHG_FIELD(F_USB_STAT, MT6370_REG_USB_STATUS1, 4, 6),
+	MT6370_CHG_FIELD(F_CHGDET, MT6370_REG_USB_STATUS1, 3, 3),
+	MT6370_CHG_FIELD(F_CHG_STAT, MT6370_REG_CHG_STAT, 6, 7),
+	MT6370_CHG_FIELD(F_BOOST_STAT, MT6370_REG_CHG_STAT, 3, 3),
+	MT6370_CHG_FIELD(F_VBAT_LVL, MT6370_REG_CHG_STAT, 5, 5),
+	MT6370_CHG_FIELD(F_FL_STROBE, MT6370_REG_FLED_EN, 2, 2),
+	MT6370_CHG_FIELD(F_CHG_MIVR_STAT, MT6370_REG_CHG_STAT1, 6, 6),
+	MT6370_CHG_FIELD(F_UVP_D_STAT, MT6370_REG_OVPCTRL_STAT, 4, 4),
+};
+
+static inline int mt6370_chg_field_get(struct mt6370_priv *priv,
+				       enum mt6370_chg_reg_field fd,
+				       unsigned int *val)
+{
+	int ret;
+	unsigned int reg_val;
+
+	ret = regmap_field_read(priv->rmap_fields[fd], &reg_val);
+	if (ret)
+		return ret;
+
+	if (mt6370_chg_fields[fd].range)
+		return linear_range_get_value(mt6370_chg_fields[fd].range,
+					       reg_val, val);
+
+	*val = reg_val;
+	return 0;
+}
+
+static inline int mt6370_chg_field_set(struct mt6370_priv *priv,
+				       enum mt6370_chg_reg_field fd,
+				       unsigned int val)
+{
+	int ret;
+	bool f;
+	const struct linear_range *r;
+
+	if (mt6370_chg_fields[fd].range) {
+		r = mt6370_chg_fields[fd].range;
+
+		if (fd == F_VMIVR) {
+			ret = linear_range_get_selector_high(r, val, &val, &f);
+			if (ret)
+				val = r->max_sel;
+		} else {
+			linear_range_get_selector_within(r, val, &val);
+		}
+	}
+
+	return regmap_field_write(priv->rmap_fields[fd], val);
+}
+
+enum {
+	MT6370_CHG_STAT_READY = 0,
+	MT6370_CHG_STAT_CHARGE_IN_PROGRESS,
+	MT6370_CHG_STAT_DONE,
+	MT6370_CHG_STAT_FAULT,
+	MT6370_CHG_STAT_MAX
+};
+
+enum {
+	MT6370_ATTACH_STAT_DETACH = 0,
+	MT6370_ATTACH_STAT_ATTACH_WAIT_FOR_BC12,
+	MT6370_ATTACH_STAT_ATTACH_BC12_DONE,
+	MT6370_ATTACH_STAT_ATTACH_MAX
+};
+
+static int mt6370_chg_otg_of_parse_cb(struct device_node *of,
+				      const struct regulator_desc *rdesc,
+				      struct regulator_config *rcfg)
+{
+	struct mt6370_priv *priv = rcfg->driver_data;
+
+	rcfg->ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(of),
+						 "enable", 0, GPIOD_OUT_LOW |
+						 GPIOD_FLAGS_BIT_NONEXCLUSIVE,
+						 rdesc->name);
+	if (IS_ERR(rcfg->ena_gpiod)) {
+		rcfg->ena_gpiod = NULL;
+		return 0;
+	}
+
+	return regmap_update_bits(priv->regmap, MT6370_REG_CHG_CTRL1,
+				  MT6370_OTG_PIN_EN_MASK,
+				  MT6370_OTG_PIN_EN_MASK);
+}
+
+static void mt6370_chg_bc12_work_func(struct work_struct *work)
+{
+	struct mt6370_priv *priv = container_of(work, struct mt6370_priv,
+						bc12_work);
+	int ret;
+	bool rpt_psy = false;
+	unsigned int attach, usb_stat;
+
+	mutex_lock(&priv->attach_lock);
+	attach = priv->attach;
+
+	switch (attach) {
+	case MT6370_ATTACH_STAT_DETACH:
+		usb_stat = 0;
+		break;
+	case MT6370_ATTACH_STAT_ATTACH_WAIT_FOR_BC12:
+		ret = mt6370_chg_field_set(priv, F_USBCHGEN, attach);
+		if (ret)
+			dev_err(priv->dev, "Failed to enable USB CHG EN\n");
+		goto bc12_work_func_out;
+	case MT6370_ATTACH_STAT_ATTACH_BC12_DONE:
+		ret = mt6370_chg_field_get(priv, F_USB_STAT, &usb_stat);
+		if (ret) {
+			dev_err(priv->dev, "Failed to get USB status\n");
+			goto bc12_work_func_out;
+		}
+		break;
+	default:
+		dev_err(priv->dev, "Invalid attach state\n");
+		goto bc12_work_func_out;
+	}
+
+	rpt_psy = true;
+
+	switch (usb_stat) {
+	case MT6370_USB_STAT_SDP:
+	case MT6370_USB_STAT_SDP_NSTD:
+		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP;
+		break;
+	case MT6370_USB_STAT_DCP:
+		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_DCP;
+		break;
+	case MT6370_USB_STAT_CDP:
+		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_CDP;
+		break;
+	case MT6370_USB_STAT_NO_VBUS:
+	case MT6370_USB_STAT_VBUS_FLOW_IS_UNDER_GOING:
+	default:
+		priv->psy_usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
+		break;
+	}
+
+bc12_work_func_out:
+	mutex_unlock(&priv->attach_lock);
+
+	if (rpt_psy)
+		power_supply_changed(priv->psy);
+}
+
+static int mt6370_chg_toggle_cfo(struct mt6370_priv *priv)
+{
+	int ret;
+	unsigned int fl_strobe;
+
+	/* check if flash led in strobe mode */
+	ret = mt6370_chg_field_get(priv, F_FL_STROBE, &fl_strobe);
+	if (ret) {
+		dev_err(priv->dev, "Failed to get FL_STROBE_EN\n");
+		return ret;
+	}
+
+	if (fl_strobe) {
+		dev_err(priv->dev, "Flash led is still in strobe mode\n");
+		return ret;
+	}
+
+	/* cfo off */
+	ret = mt6370_chg_field_set(priv, F_CFO_EN, 0);
+	if (ret) {
+		dev_err(priv->dev, "Failed to disable CFO_EN\n");
+		return ret;
+	}
+
+	/* cfo on */
+	ret = mt6370_chg_field_set(priv, F_CFO_EN, 1);
+	if (ret)
+		dev_err(priv->dev, "Failed to enable CFO_EN\n");
+
+	return ret;
+}
+
+static int mt6370_chg_read_adc_chan(struct mt6370_priv *priv, unsigned int chan,
+				    int *val)
+{
+	int ret;
+
+	if (chan >= MT6370_ADC_CHAN_MAX)
+		return -EINVAL;
+
+	ret = iio_read_channel_processed(&priv->iio_adcs[chan], val);
+	if (ret)
+		dev_err(priv->dev, "Failed to read ADC\n");
+
+	return ret;
+}
+
+static void mt6370_chg_mivr_dwork_func(struct work_struct *work)
+{
+	struct mt6370_priv *priv = container_of(work, struct mt6370_priv,
+						mivr_dwork.work);
+	int ret;
+	unsigned int mivr_stat, ibus;
+
+	ret = mt6370_chg_field_get(priv, F_CHG_MIVR_STAT, &mivr_stat);
+	if (ret) {
+		dev_err(priv->dev, "Failed to get mivr state\n");
+		goto mivr_handler_out;
+	}
+
+	if (!mivr_stat)
+		goto mivr_handler_out;
+
+	ret = mt6370_chg_read_adc_chan(priv, MT6370_ADC_CHAN_IBUS, &ibus);
+	if (ret) {
+		dev_err(priv->dev, "Failed to get ibus\n");
+		goto mivr_handler_out;
+	}
+
+	if (ibus < MT6370_MIVR_IBUS_TH_100_mA) {
+		ret = mt6370_chg_toggle_cfo(priv);
+		if (ret)
+			dev_err(priv->dev, "Failed to toggle cfo\n");
+	}
+
+mivr_handler_out:
+	enable_irq(priv->irq_nums[MT6370_IRQ_MIVR]);
+	pm_relax(priv->dev);
+}
+
+static void mt6370_chg_pwr_rdy_check(struct mt6370_priv *priv)
+{
+	int ret;
+	unsigned int opposite_pwr_rdy, otg_en;
+	union power_supply_propval val;
+
+	/* Check in OTG mode or not */
+	ret = mt6370_chg_field_get(priv, F_BOOST_STAT, &otg_en);
+	if (ret) {
+		dev_err(priv->dev, "Failed to get OTG state\n");
+		return;
+	}
+
+	if (otg_en)
+		return;
+
+	ret = mt6370_chg_field_get(priv, F_UVP_D_STAT, &opposite_pwr_rdy);
+	if (ret) {
+		dev_err(priv->dev, "Failed to get opposite power ready state\n");
+		return;
+	}
+
+	val.intval = opposite_pwr_rdy ?
+		     MT6370_ATTACH_STAT_DETACH :
+		     MT6370_ATTACH_STAT_ATTACH_WAIT_FOR_BC12;
+
+	ret = power_supply_set_property(priv->psy, POWER_SUPPLY_PROP_ONLINE,
+					&val);
+	if (ret)
+		dev_err(priv->dev, "Failed to start attach/detach flow\n");
+}
+
+static int mt6370_chg_get_online(struct mt6370_priv *priv,
+				 union power_supply_propval *val)
+{
+	mutex_lock(&priv->attach_lock);
+	val->intval = !!priv->attach;
+	mutex_unlock(&priv->attach_lock);
+
+	return 0;
+}
+
+static int mt6370_chg_get_status(struct mt6370_priv *priv,
+				 union power_supply_propval *val)
+{
+	int ret;
+	unsigned int chg_stat;
+	union power_supply_propval online;
+
+	ret = power_supply_get_property(priv->psy, POWER_SUPPLY_PROP_ONLINE,
+					&online);
+	if (ret) {
+		dev_err(priv->dev, "Failed to get online status\n");
+		return ret;
+	}
+
+	if (!online.intval) {
+		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+		return 0;
+	}
+
+	ret = mt6370_chg_field_get(priv, F_CHG_STAT, &chg_stat);
+	if (ret)
+		return ret;
+
+	switch (chg_stat) {
+	case MT6370_CHG_STAT_READY:
+	case MT6370_CHG_STAT_FAULT:
+		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		return ret;
+	case MT6370_CHG_STAT_CHARGE_IN_PROGRESS:
+		val->intval = POWER_SUPPLY_STATUS_CHARGING;
+		return ret;
+	case MT6370_CHG_STAT_DONE:
+		val->intval = POWER_SUPPLY_STATUS_FULL;
+		return ret;
+	default:
+		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+		return ret;
+	}
+}
+
+static int mt6370_chg_get_charge_type(struct mt6370_priv *priv,
+				      union power_supply_propval *val)
+{
+	int type, ret;
+	unsigned int chg_stat, vbat_lvl;
+
+	ret = mt6370_chg_field_get(priv, F_CHG_STAT, &chg_stat);
+	if (ret)
+		return ret;
+
+	ret = mt6370_chg_field_get(priv, F_VBAT_LVL, &vbat_lvl);
+	if (ret)
+		return ret;
+
+	switch (chg_stat) {
+	case MT6370_CHG_STAT_CHARGE_IN_PROGRESS:
+		if (vbat_lvl)
+			type = POWER_SUPPLY_CHARGE_TYPE_FAST;
+		else
+			type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
+		break;
+	case MT6370_CHG_STAT_READY:
+	case MT6370_CHG_STAT_DONE:
+	case MT6370_CHG_STAT_FAULT:
+	default:
+		type = POWER_SUPPLY_CHARGE_TYPE_NONE;
+		break;
+	}
+
+	val->intval = type;
+
+	return 0;
+}
+
+static int mt6370_chg_set_online(struct mt6370_priv *priv,
+				 const union power_supply_propval *val)
+{
+	bool pwr_rdy = !!val->intval;
+
+	mutex_lock(&priv->attach_lock);
+	if (pwr_rdy == !!priv->attach) {
+		dev_err(priv->dev, "pwr_rdy is same(%d)\n", pwr_rdy);
+		mutex_unlock(&priv->attach_lock);
+		return 0;
+	}
+
+	priv->attach = pwr_rdy;
+	mutex_unlock(&priv->attach_lock);
+
+	if (!queue_work(priv->wq, &priv->bc12_work))
+		dev_err(priv->dev, "bc12 work has already queued\n");
+
+	return 0;
+}
+
+static int mt6370_chg_get_property(struct power_supply *psy,
+				   enum power_supply_property psp,
+				   union power_supply_propval *val)
+{
+	struct mt6370_priv *priv = power_supply_get_drvdata(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		return mt6370_chg_get_online(priv, val);
+	case POWER_SUPPLY_PROP_STATUS:
+		return mt6370_chg_get_status(priv, val);
+	case POWER_SUPPLY_PROP_CHARGE_TYPE:
+		return mt6370_chg_get_charge_type(priv, val);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+		return mt6370_chg_field_get(priv, F_ICHG, &val->intval);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+		val->intval = linear_range_get_max_value(&mt6370_chg_ranges[MT6370_RANGE_F_ICHG]);
+		return 0;
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+		return mt6370_chg_field_get(priv, F_VOREG, &val->intval);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+		val->intval = linear_range_get_max_value(&mt6370_chg_ranges[MT6370_RANGE_F_VOREG]);
+		return 0;
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		return mt6370_chg_field_get(priv, F_IAICR, &val->intval);
+	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+		return mt6370_chg_field_get(priv, F_VMIVR, &val->intval);
+	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+		return mt6370_chg_field_get(priv, F_IPREC, &val->intval);
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+		return mt6370_chg_field_get(priv, F_IEOC, &val->intval);
+	case POWER_SUPPLY_PROP_USB_TYPE:
+		val->intval = priv->psy_usb_type;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mt6370_chg_set_property(struct power_supply *psy,
+				   enum power_supply_property psp,
+				   const union power_supply_propval *val)
+{
+	struct mt6370_priv *priv = power_supply_get_drvdata(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		return mt6370_chg_set_online(priv, val);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+		return mt6370_chg_field_set(priv, F_ICHG, val->intval);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+		return mt6370_chg_field_set(priv, F_VOREG, val->intval);
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		return mt6370_chg_field_set(priv, F_IAICR, val->intval);
+	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+		return mt6370_chg_field_set(priv, F_VMIVR, val->intval);
+	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+		return mt6370_chg_field_set(priv, F_IPREC, val->intval);
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+		return mt6370_chg_field_set(priv, F_IEOC, val->intval);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mt6370_chg_property_is_writeable(struct power_supply *psy,
+					    enum power_supply_property psp)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+	case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+		return 1;
+	default:
+		return 0;
+	}
+}
+
+static enum power_supply_property mt6370_chg_properties[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_CHARGE_TYPE,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+	POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
+	POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
+	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+	POWER_SUPPLY_PROP_USB_TYPE,
+};
+
+static enum power_supply_usb_type mt6370_chg_usb_types[] = {
+	POWER_SUPPLY_USB_TYPE_UNKNOWN,
+	POWER_SUPPLY_USB_TYPE_SDP,
+	POWER_SUPPLY_USB_TYPE_CDP,
+	POWER_SUPPLY_USB_TYPE_DCP,
+};
+
+static const struct power_supply_desc mt6370_chg_psy_desc = {
+	.name = "mt6370-charger",
+	.type = POWER_SUPPLY_TYPE_USB,
+	.properties = mt6370_chg_properties,
+	.num_properties = ARRAY_SIZE(mt6370_chg_properties),
+	.get_property = mt6370_chg_get_property,
+	.set_property = mt6370_chg_set_property,
+	.property_is_writeable = mt6370_chg_property_is_writeable,
+	.usb_types = mt6370_chg_usb_types,
+	.num_usb_types = ARRAY_SIZE(mt6370_chg_usb_types),
+};
+
+static const struct regulator_ops mt6370_chg_otg_ops = {
+	.list_voltage = regulator_list_voltage_linear,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_current_limit = regulator_set_current_limit_regmap,
+	.get_current_limit = regulator_get_current_limit_regmap,
+};
+
+static const u32 mt6370_chg_otg_oc_ma[] = {
+	500000, 700000, 1100000, 1300000, 1800000, 2100000, 2400000,
+};
+
+static const struct regulator_desc mt6370_chg_otg_rdesc = {
+	.of_match = "usb-otg-vbus-regulator",
+	.of_parse_cb = mt6370_chg_otg_of_parse_cb,
+	.name = "mt6370-usb-otg-vbus",
+	.ops = &mt6370_chg_otg_ops,
+	.owner = THIS_MODULE,
+	.type = REGULATOR_VOLTAGE,
+	.min_uV = 4425000,
+	.uV_step = 25000,
+	.n_voltages = 57,
+	.vsel_reg = MT6370_REG_CHG_CTRL5,
+	.vsel_mask = MT6370_VOBST_MASK,
+	.enable_reg = MT6370_REG_CHG_CTRL1,
+	.enable_mask = MT6370_OPA_MODE_MASK,
+	.curr_table = mt6370_chg_otg_oc_ma,
+	.n_current_limits = ARRAY_SIZE(mt6370_chg_otg_oc_ma),
+	.csel_reg = MT6370_REG_CHG_CTRL10,
+	.csel_mask = MT6370_OTG_OC_MASK,
+};
+
+static int mt6370_chg_init_rmap_fields(struct mt6370_priv *priv)
+{
+	int i;
+	const struct mt6370_chg_field *fds = mt6370_chg_fields;
+
+	for (i = 0; i < F_MAX; i++) {
+		priv->rmap_fields[i] = devm_regmap_field_alloc(priv->dev,
+							       priv->regmap,
+							       fds[i].field);
+		if (IS_ERR(priv->rmap_fields[i]))
+			return dev_err_probe(priv->dev,
+					PTR_ERR(priv->rmap_fields[i]),
+					"Failed to allocate regmapfield[%s]\n",
+					fds[i].name);
+	}
+
+	return 0;
+}
+
+static int mt6370_chg_init_setting(struct mt6370_priv *priv)
+{
+	int ret;
+
+	/* Disable usb_chg_en */
+	ret = mt6370_chg_field_set(priv, F_USBCHGEN, 0);
+	if (ret) {
+		dev_err(priv->dev, "Failed to disable usb_chg_en\n");
+		return ret;
+	}
+
+	/* Disable input current limit */
+	ret = mt6370_chg_field_set(priv, F_ILIM_EN, 0);
+	if (ret) {
+		dev_err(priv->dev, "Failed to disable input current limit\n");
+		return ret;
+	}
+
+	/* ICHG/IEOC Workaround, ICHG can not be set less than 900mA */
+	ret = mt6370_chg_field_set(priv, F_ICHG, 900000);
+	if (ret) {
+		dev_err(priv->dev, "Failed to set ICHG to 900mA");
+		return ret;
+	}
+
+	/* Change input current limit selection to using IAICR results */
+	ret = mt6370_chg_field_set(priv, F_IINLMTSEL, 2);
+	if (ret) {
+		dev_err(priv->dev, "Failed to set IINLMTSEL\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+#define MT6370_CHG_DT_PROP_DECL(_name, _type, _field)	\
+{							\
+	.name = "mediatek,chg-" #_name,			\
+	.type = MT6370_PARSE_TYPE_##_type,		\
+	.fd = _field,					\
+}
+
+static int mt6370_chg_init_otg_regulator(struct mt6370_priv *priv)
+{
+	struct regulator_config rcfg = {
+		.dev = priv->dev,
+		.regmap = priv->regmap,
+		.driver_data = priv,
+	};
+
+	priv->rdev = devm_regulator_register(priv->dev, &mt6370_chg_otg_rdesc,
+					     &rcfg);
+
+	return PTR_ERR_OR_ZERO(priv->rdev);
+}
+
+static int mt6370_chg_init_psy(struct mt6370_priv *priv)
+{
+	struct power_supply_config cfg = {
+		.drv_data = priv,
+		.of_node = dev_of_node(priv->dev),
+	};
+
+	priv->psy = devm_power_supply_register(priv->dev, &mt6370_chg_psy_desc,
+					       &cfg);
+
+	return PTR_ERR_OR_ZERO(priv->psy);
+}
+
+static void mt6370_chg_destroy_attach_lock(void *data)
+{
+	struct mutex *attach_lock = data;
+
+	mutex_destroy(attach_lock);
+}
+
+static void mt6370_chg_destroy_wq(void *data)
+{
+	struct workqueue_struct *wq = data;
+
+	flush_workqueue(wq);
+	destroy_workqueue(wq);
+}
+
+static irqreturn_t mt6370_attach_i_handler(int irq, void *data)
+{
+	struct mt6370_priv *priv = data;
+	unsigned int otg_en;
+	int ret;
+
+	/* Check in OTG mode or not */
+	ret = mt6370_chg_field_get(priv, F_BOOST_STAT, &otg_en);
+	if (ret) {
+		dev_err(priv->dev, "Failed to get OTG state\n");
+		return IRQ_NONE;
+	}
+
+	if (otg_en)
+		return IRQ_HANDLED;
+
+	mutex_lock(&priv->attach_lock);
+	priv->attach = MT6370_ATTACH_STAT_ATTACH_BC12_DONE;
+	mutex_unlock(&priv->attach_lock);
+
+	if (!queue_work(priv->wq, &priv->bc12_work))
+		dev_err(priv->dev, "bc12 work has already queued\n");
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mt6370_uvp_d_evt_handler(int irq, void *data)
+{
+	struct mt6370_priv *priv = data;
+
+	mt6370_chg_pwr_rdy_check(priv);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mt6370_mivr_handler(int irq, void *data)
+{
+	struct mt6370_priv *priv = data;
+
+	pm_stay_awake(priv->dev);
+	disable_irq_nosync(priv->irq_nums[MT6370_IRQ_MIVR]);
+	schedule_delayed_work(&priv->mivr_dwork, msecs_to_jiffies(200));
+
+	return IRQ_HANDLED;
+}
+
+#define MT6370_CHG_IRQ(_name)						\
+{									\
+	.name = #_name,							\
+	.handler = mt6370_##_name##_handler,				\
+}
+
+static int mt6370_chg_init_irq(struct mt6370_priv *priv)
+{
+	int i, ret;
+	const struct {
+		char *name;
+		irq_handler_t handler;
+	} mt6370_chg_irqs[] = {
+		MT6370_CHG_IRQ(attach_i),
+		MT6370_CHG_IRQ(uvp_d_evt),
+		MT6370_CHG_IRQ(mivr),
+	};
+
+	for (i = 0; i < ARRAY_SIZE(mt6370_chg_irqs); i++) {
+		ret = platform_get_irq_byname(to_platform_device(priv->dev),
+					      mt6370_chg_irqs[i].name);
+		if (ret < 0)
+			return dev_err_probe(priv->dev, ret,
+					     "Failed to get irq %s\n",
+					     mt6370_chg_irqs[i].name);
+
+		priv->irq_nums[i] = ret;
+		ret = devm_request_threaded_irq(priv->dev, ret, NULL,
+						mt6370_chg_irqs[i].handler,
+						IRQF_TRIGGER_FALLING,
+						dev_name(priv->dev), priv);
+		if (ret)
+			return dev_err_probe(priv->dev, ret,
+					     "Failed to request irq %s\n",
+					     mt6370_chg_irqs[i].name);
+	}
+
+	return 0;
+}
+
+static int mt6370_chg_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mt6370_priv *priv;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = &pdev->dev;
+
+	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!priv->regmap)
+		return dev_err_probe(dev, -ENODEV, "Failed to get regmap\n");
+
+	ret = mt6370_chg_init_rmap_fields(priv);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to init regmap fields\n");
+
+	platform_set_drvdata(pdev, priv);
+
+	priv->iio_adcs = devm_iio_channel_get_all(priv->dev);
+	if (IS_ERR(priv->iio_adcs))
+		return dev_err_probe(dev, PTR_ERR(priv->iio_adcs),
+				     "Failed to get iio adc\n");
+
+	ret = mt6370_chg_init_otg_regulator(priv);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to init OTG regulator\n");
+
+	ret = mt6370_chg_init_psy(priv);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to init psy\n");
+
+	mutex_init(&priv->attach_lock);
+	ret = devm_add_action_or_reset(dev, mt6370_chg_destroy_attach_lock,
+				       &priv->attach_lock);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to init attach lock\n");
+
+	priv->attach = MT6370_ATTACH_STAT_DETACH;
+
+	priv->wq = create_singlethread_workqueue(dev_name(priv->dev));
+	if (!priv->wq)
+		return dev_err_probe(dev, -ENOMEM,
+				     "Failed to create workqueue\n");
+
+	ret = devm_add_action_or_reset(dev, mt6370_chg_destroy_wq, priv->wq);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to init wq\n");
+
+	ret = devm_work_autocancel(dev, &priv->bc12_work, mt6370_chg_bc12_work_func);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to init bc12 work\n");
+
+	ret = devm_delayed_work_autocancel(dev, &priv->mivr_dwork, mt6370_chg_mivr_dwork_func);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to init mivr delayed work\n");
+
+	ret = mt6370_chg_init_setting(priv);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to init mt6370 charger setting\n");
+
+	ret = mt6370_chg_init_irq(priv);
+	if (ret)
+		return ret;
+
+	mt6370_chg_pwr_rdy_check(priv);
+
+	return 0;
+}
+
+static const struct of_device_id mt6370_chg_of_match[] = {
+	{ .compatible = "mediatek,mt6370-charger", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, mt6370_chg_of_match);
+
+static struct platform_driver mt6370_chg_driver = {
+	.probe = mt6370_chg_probe,
+	.driver = {
+		.name = "mt6370-charger",
+		.of_match_table = mt6370_chg_of_match,
+	},
+};
+module_platform_driver(mt6370_chg_driver);
+
+MODULE_AUTHOR("ChiaEn Wu <chiaen_wu@richtek.com>");
+MODULE_DESCRIPTION("MediaTek MT6370 Charger Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index 4239591e152216..5369abaceb5ccb 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -442,7 +442,7 @@ static int add_prop_uevent(struct device *dev, struct kobj_uevent_env *env,
 	if (ret == -ENODEV || ret == -ENODATA) {
 		/*
 		 * When a battery is absent, we expect -ENODEV. Don't abort;
-		 * send the uevent with at least the the PRESENT=0 property
+		 * send the uevent with at least the PRESENT=0 property
 		 */
 		return 0;
 	}
diff --git a/drivers/power/supply/tps65217_charger.c b/drivers/power/supply/tps65217_charger.c
index ba33d1617e0b6d..a4bc9f2a10bca1 100644
--- a/drivers/power/supply/tps65217_charger.c
+++ b/drivers/power/supply/tps65217_charger.c
@@ -50,7 +50,7 @@ static int tps65217_config_charger(struct tps65217_charger *charger)
 	 * tps65217 rev. G, p. 31 (see p. 32 for NTC schematic)
 	 *
 	 * The device can be configured to support a 100k NTC (B = 3960) by
-	 * setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it
+	 * setting the NTC_TYPE bit in register CHGCONFIG1 to 1. However it
 	 * is not recommended to do so. In sleep mode, the charger continues
 	 * charging the battery, but all register values are reset to default
 	 * values. Therefore, the charger would get the wrong temperature
diff --git a/include/linux/linear_range.h b/include/linux/linear_range.h
index fd3d0b358f2283..2e4f4c3539c075 100644
--- a/include/linux/linear_range.h
+++ b/include/linux/linear_range.h
@@ -26,6 +26,17 @@ struct linear_range {
 	unsigned int step;
 };
 
+#define LINEAR_RANGE(_min, _min_sel, _max_sel, _step)		\
+	{							\
+		.min = _min,					\
+		.min_sel = _min_sel,				\
+		.max_sel = _max_sel,				\
+		.step = _step,					\
+	}
+
+#define LINEAR_RANGE_IDX(_idx, _min, _min_sel, _max_sel, _step)	\
+	[_idx] = LINEAR_RANGE(_min, _min_sel, _max_sel, _step)
+
 unsigned int linear_range_values_in_range(const struct linear_range *r);
 unsigned int linear_range_values_in_range_array(const struct linear_range *r,
 						int ranges);
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index cb380c1d945952..aa2c4a7c4826da 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -374,9 +374,37 @@ struct power_supply_vbat_ri_table {
  *   These timers should be chosen to align with the typical discharge curve
  *   for the battery.
  *
- * When the main CC/CV charging is complete the battery can optionally be
- * maintenance charged at the voltages from this table: a table of settings is
- * traversed using a slightly lower current and voltage than what is used for
+ * Ordinary CC/CV charging will stop charging when the charge current goes
+ * below charge_term_current_ua, and then restart it (if the device is still
+ * plugged into the charger) at charge_restart_voltage_uv. This happens in most
+ * consumer products because the power usage while connected to a charger is
+ * not zero, and devices are not manufactured to draw power directly from the
+ * charger: instead they will at all times dissipate the battery a little, like
+ * the power used in standby mode. This will over time give a charge graph
+ * such as this:
+ *
+ * Energy
+ *  ^      ...        ...      ...      ...      ...      ...      ...
+ *  |    .   .       .  .     .  .     .  .     .  .     .  .     .
+ *  |  ..     .   ..     .  ..    .  ..    .  ..    .  ..    .  ..
+ *  |.          ..        ..       ..       ..       ..       ..
+ *  +-------------------------------------------------------------------> t
+ *
+ * Practically this means that the Li-ions are wandering back and forth in the
+ * battery and this causes degeneration of the battery anode and cathode.
+ * To prolong the life of the battery, maintenance charging is applied after
+ * reaching charge_term_current_ua to hold up the charge in the battery while
+ * consuming power, thus lowering the wear on the battery:
+ *
+ * Energy
+ *  ^      .......................................
+ *  |    .                                        ......................
+ *  |  ..
+ *  |.
+ *  +-------------------------------------------------------------------> t
+ *
+ * Maintenance charging uses the voltages from this table: a table of settings
+ * is traversed using a slightly lower current and voltage than what is used for
  * CC/CV charging. The maintenance charging will for safety reasons not go on
  * indefinately: we lower the current and voltage with successive maintenance
  * settings, then disable charging completely after we reach the last one,
@@ -385,14 +413,22 @@ struct power_supply_vbat_ri_table {
  * ordinary CC/CV charging from there.
  *
  * As an example, a Samsung EB425161LA Lithium-Ion battery is CC/CV charged
- * at 900mA to 4340mV, then maintenance charged at 600mA and 4150mV for
- * 60 hours, then maintenance charged at 600mA and 4100mV for 200 hours.
+ * at 900mA to 4340mV, then maintenance charged at 600mA and 4150mV for up to
+ * 60 hours, then maintenance charged at 600mA and 4100mV for up to 200 hours.
  * After this the charge cycle is restarted waiting for
  * charge_restart_voltage_uv.
  *
  * For most mobile electronics this type of maintenance charging is enough for
  * the user to disconnect the device and make use of it before both maintenance
- * charging cycles are complete.
+ * charging cycles are complete, if the current and voltage has been chosen
+ * appropriately. These need to be determined from battery discharge curves
+ * and expected standby current.
+ *
+ * If the voltage anyway drops to charge_restart_voltage_uv during maintenance
+ * charging, ordinary CC/CV charging is restarted. This can happen if the
+ * device is e.g. actively used during charging, so more current is drawn than
+ * the expected stand-by current. Also overvoltage protection will be applied
+ * as usual.
  */
 struct power_supply_maintenance_charge_table {
 	int charge_current_max_ua;