Merge tag 'char-misc-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc and other driver subsystem updates from Greg KH:
 "Here is the large set of driver changes for char/misc drivers and
  other smaller driver subsystems that flow through this git tree.

  Included in here are:

   - New IIO drivers and features and improvments in that subsystem

   - New hwtracing drivers and additions to that subsystem

   - lots of interconnect changes and new drivers as that subsystem
     seems under very active development recently. This required also
     merging in the icc subsystem changes through this tree.

   - FPGA driver updates

   - counter subsystem and driver updates

   - MHI driver updates

   - nvmem driver updates

   - documentation updates

   - Other smaller driver updates and fixes, full details in the
     shortlog

  All of these have been in linux-next for a while with no reported
  problems"

* tag 'char-misc-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (223 commits)
  scripts/tags.sh: fix incompatibility with PCRE2
  firmware: coreboot: Remove GOOGLE_COREBOOT_TABLE_ACPI/OF Kconfig entries
  mei: lower the log level for non-fatal failed messages
  mei: bus: disallow driver match while dismantling device
  misc: vmw_balloon: fix memory leak with using debugfs_lookup()
  nvmem: stm32: fix OPTEE dependency
  dt-bindings: nvmem: qfprom: add IPQ8074 compatible
  nvmem: qcom-spmi-sdam: register at device init time
  nvmem: rave-sp-eeprm: fix kernel-doc bad line warning
  nvmem: stm32: detect bsec pta presence for STM32MP15x
  nvmem: stm32: add OP-TEE support for STM32MP13x
  nvmem: core: use nvmem_add_one_cell() in nvmem_add_cells_from_of()
  nvmem: core: add nvmem_add_one_cell()
  nvmem: core: drop the removal of the cells in nvmem_add_cells()
  nvmem: core: move struct nvmem_cell_info to nvmem-provider.h
  nvmem: core: add an index parameter to the cell
  of: property: add #nvmem-cell-cells property
  of: property: make #.*-cells optional for simple props
  of: base: add of_parse_phandle_with_optional_args()
  net: add helper eth_addr_add()
  ...

9 files changed, 95 insertions, 78 deletions

diff --git a/drivers/fpga/dfl-afu-region.c b/drivers/fpga/dfl-afu-region.c
index 0804b7a0c2986..2e7b416294065 100644
--- a/drivers/fpga/dfl-afu-region.c
+++ b/drivers/fpga/dfl-afu-region.c
@@ -39,6 +39,7 @@ static struct dfl_afu_mmio_region *get_region_by_index(struct dfl_afu *afu,
 /**
  * afu_mmio_region_add - add a mmio region to given feature dev.
  *
+ * @pdata: afu platform device's pdata.
  * @region_index: region index.
  * @region_size: region size.
  * @phys: region's physical address of this region.
diff --git a/drivers/fpga/dfl-afu.h b/drivers/fpga/dfl-afu.h
index e5020e2b1f3df..674e9772f0ea7 100644
--- a/drivers/fpga/dfl-afu.h
+++ b/drivers/fpga/dfl-afu.h
@@ -41,7 +41,7 @@ struct dfl_afu_mmio_region {
 };
 
 /**
- * struct fpga_afu_dma_region - afu DMA region data structure
+ * struct dfl_afu_dma_region - afu DMA region data structure
  *
  * @user_addr: region userspace virtual address.
  * @length: region length.
diff --git a/drivers/fpga/dfl-fme-perf.c b/drivers/fpga/dfl-fme-perf.c
index 587c82be12f7a..7422d2bc6f374 100644
--- a/drivers/fpga/dfl-fme-perf.c
+++ b/drivers/fpga/dfl-fme-perf.c
@@ -141,7 +141,7 @@
  * @fab_port_id: used to indicate current working mode of fabric counters.
  * @fab_lock: lock to protect fabric counters working mode.
  * @cpu: active CPU to which the PMU is bound for accesses.
- * @cpuhp_node: node for CPU hotplug notifier link.
+ * @node: node for CPU hotplug notifier link.
  * @cpuhp_state: state for CPU hotplug notification;
  */
 struct fme_perf_priv {
diff --git a/drivers/fpga/dfl-fme-pr.c b/drivers/fpga/dfl-fme-pr.c
index d61ce9a188792..cdcf6dea4cc95 100644
--- a/drivers/fpga/dfl-fme-pr.c
+++ b/drivers/fpga/dfl-fme-pr.c
@@ -164,7 +164,7 @@ free_exit:
 
 /**
  * dfl_fme_create_mgr - create fpga mgr platform device as child device
- *
+ * @feature: sub feature info
  * @pdata: fme platform_device's pdata
  *
  * Return: mgr platform device if successful, and error code otherwise.
@@ -273,7 +273,7 @@ static void dfl_fme_destroy_bridge(struct dfl_fme_bridge *fme_br)
 }
 
 /**
- * dfl_fme_destroy_bridge - destroy all fpga bridge platform device
+ * dfl_fme_destroy_bridges - destroy all fpga bridge platform device
  * @pdata: fme platform device's pdata
  */
 static void dfl_fme_destroy_bridges(struct dfl_feature_platform_data *pdata)
diff --git a/drivers/fpga/dfl-fme-pr.h b/drivers/fpga/dfl-fme-pr.h
index 096a699089d30..761f80f63312b 100644
--- a/drivers/fpga/dfl-fme-pr.h
+++ b/drivers/fpga/dfl-fme-pr.h
@@ -58,7 +58,7 @@ struct dfl_fme_bridge {
 };
 
 /**
- * struct dfl_fme_bridge_pdata - platform data for FME bridge platform device.
+ * struct dfl_fme_br_pdata - platform data for FME bridge platform device.
  *
  * @cdev: container device.
  * @port_id: port id.
diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index 0a4227bc94623..b010f0a83a785 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -46,7 +46,7 @@ static const char *dfl_pdata_key_strings[DFL_ID_MAX] = {
 };
 
 /**
- * dfl_dev_info - dfl feature device information.
+ * struct dfl_dev_info - dfl feature device information.
  * @name: name string of the feature platform device.
  * @dfh_id: id value in Device Feature Header (DFH) register by DFL spec.
  * @id: idr id of the feature dev.
@@ -68,7 +68,7 @@ static struct dfl_dev_info dfl_devs[] = {
 };
 
 /**
- * dfl_chardev_info - chardev information of dfl feature device
+ * struct dfl_chardev_info - chardev information of dfl feature device
  * @name: nmae string of the char device.
  * @devt: devt of the char device.
  */
diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index 20eaddce6988b..1d724a28f00ad 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -267,7 +267,7 @@ struct dfl_feature_irq_ctx {
  *
  * @dev: ptr to pdev of the feature device which has the sub feature.
  * @id: sub feature id.
- * @revision: revisition of the instance of a feature.
+ * @revision: revision of this sub feature.
  * @resource_index: each sub feature has one mmio resource for its registers.
  *		    this index is used to find its mmio resource from the
  *		    feature dev (platform device)'s resources.
diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c
index 727704431f618..5cd40acab5bfb 100644
--- a/drivers/fpga/fpga-bridge.c
+++ b/drivers/fpga/fpga-bridge.c
@@ -293,12 +293,15 @@ static ssize_t state_show(struct device *dev,
 			  struct device_attribute *attr, char *buf)
 {
 	struct fpga_bridge *bridge = to_fpga_bridge(dev);
-	int enable = 1;
+	int state = 1;
 
-	if (bridge->br_ops && bridge->br_ops->enable_show)
-		enable = bridge->br_ops->enable_show(bridge);
+	if (bridge->br_ops && bridge->br_ops->enable_show) {
+		state = bridge->br_ops->enable_show(bridge);
+		if (state < 0)
+			return state;
+	}
 
-	return sprintf(buf, "%s\n", enable ? "enabled" : "disabled");
+	return sysfs_emit(buf, "%s\n", state ? "enabled" : "disabled");
 }
 
 static DEVICE_ATTR_RO(name);
diff --git a/drivers/fpga/microchip-spi.c b/drivers/fpga/microchip-spi.c
index 7436976ea9048..d6070e7f5205d 100644
--- a/drivers/fpga/microchip-spi.c
+++ b/drivers/fpga/microchip-spi.c
@@ -6,6 +6,7 @@
 #include <asm/unaligned.h>
 #include <linux/delay.h>
 #include <linux/fpga/fpga-mgr.h>
+#include <linux/iopoll.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/spi/spi.h>
@@ -33,7 +34,7 @@
 
 #define	MPF_BITS_PER_COMPONENT_SIZE	22
 
-#define	MPF_STATUS_POLL_RETRIES		10000
+#define	MPF_STATUS_POLL_TIMEOUT		(2 * USEC_PER_SEC)
 #define	MPF_STATUS_BUSY			BIT(0)
 #define	MPF_STATUS_READY		BIT(1)
 #define	MPF_STATUS_SPI_VIOLATION	BIT(2)
@@ -42,46 +43,55 @@
 struct mpf_priv {
 	struct spi_device *spi;
 	bool program_mode;
+	u8 tx __aligned(ARCH_KMALLOC_MINALIGN);
+	u8 rx;
 };
 
-static int mpf_read_status(struct spi_device *spi)
+static int mpf_read_status(struct mpf_priv *priv)
 {
-	u8 status = 0, status_command = MPF_SPI_READ_STATUS;
-	struct spi_transfer xfers[2] = { 0 };
-	int ret;
-
 	/*
 	 * HW status is returned on MISO in the first byte after CS went
 	 * active. However, first reading can be inadequate, so we submit
 	 * two identical SPI transfers and use result of the later one.
 	 */
-	xfers[0].tx_buf = &status_command;
-	xfers[1].tx_buf = &status_command;
-	xfers[0].rx_buf = &status;
-	xfers[1].rx_buf = &status;
-	xfers[0].len = 1;
-	xfers[1].len = 1;
-	xfers[0].cs_change = 1;
+	struct spi_transfer xfers[2] = {
+		{
+			.tx_buf = &priv->tx,
+			.rx_buf = &priv->rx,
+			.len = 1,
+			.cs_change = 1,
+		}, {
+			.tx_buf = &priv->tx,
+			.rx_buf = &priv->rx,
+			.len = 1,
+		},
+	};
+	u8 status;
+	int ret;
 
-	ret = spi_sync_transfer(spi, xfers, 2);
+	priv->tx = MPF_SPI_READ_STATUS;
+
+	ret = spi_sync_transfer(priv->spi, xfers, 2);
+	if (ret)
+		return ret;
+
+	status = priv->rx;
 
 	if ((status & MPF_STATUS_SPI_VIOLATION) ||
 	    (status & MPF_STATUS_SPI_ERROR))
-		ret = -EIO;
+		return -EIO;
 
-	return ret ? : status;
+	return status;
 }
 
 static enum fpga_mgr_states mpf_ops_state(struct fpga_manager *mgr)
 {
 	struct mpf_priv *priv = mgr->priv;
-	struct spi_device *spi;
 	bool program_mode;
 	int status;
 
-	spi = priv->spi;
 	program_mode = priv->program_mode;
-	status = mpf_read_status(spi);
+	status = mpf_read_status(priv);
 
 	if (!program_mode && !status)
 		return FPGA_MGR_STATE_OPERATING;
@@ -185,52 +195,53 @@ static int mpf_ops_parse_header(struct fpga_manager *mgr,
 	return 0;
 }
 
-/* Poll HW status until busy bit is cleared and mask bits are set. */
-static int mpf_poll_status(struct spi_device *spi, u8 mask)
+static int mpf_poll_status(struct mpf_priv *priv, u8 mask)
 {
-	int status, retries = MPF_STATUS_POLL_RETRIES;
-
-	while (retries--) {
-		status = mpf_read_status(spi);
-		if (status < 0)
-			return status;
+	int ret, status;
 
-		if (status & MPF_STATUS_BUSY)
-			continue;
-
-		if (!mask || (status & mask))
-			return status;
-	}
+	/*
+	 * Busy poll HW status. Polling stops if any of the following
+	 * conditions are met:
+	 *  - timeout is reached
+	 *  - mpf_read_status() returns an error
+	 *  - busy bit is cleared AND mask bits are set
+	 */
+	ret = read_poll_timeout(mpf_read_status, status,
+				(status < 0) ||
+				((status & (MPF_STATUS_BUSY | mask)) == mask),
+				0, MPF_STATUS_POLL_TIMEOUT, false, priv);
+	if (ret < 0)
+		return ret;
 
-	return -EBUSY;
+	return status;
 }
 
-static int mpf_spi_write(struct spi_device *spi, const void *buf, size_t buf_size)
+static int mpf_spi_write(struct mpf_priv *priv, const void *buf, size_t buf_size)
 {
-	int status = mpf_poll_status(spi, 0);
+	int status = mpf_poll_status(priv, 0);
 
 	if (status < 0)
 		return status;
 
-	return spi_write(spi, buf, buf_size);
+	return spi_write_then_read(priv->spi, buf, buf_size, NULL, 0);
 }
 
-static int mpf_spi_write_then_read(struct spi_device *spi,
+static int mpf_spi_write_then_read(struct mpf_priv *priv,
 				   const void *txbuf, size_t txbuf_size,
 				   void *rxbuf, size_t rxbuf_size)
 {
 	const u8 read_command[] = { MPF_SPI_READ_DATA };
 	int ret;
 
-	ret = mpf_spi_write(spi, txbuf, txbuf_size);
+	ret = mpf_spi_write(priv, txbuf, txbuf_size);
 	if (ret)
 		return ret;
 
-	ret = mpf_poll_status(spi, MPF_STATUS_READY);
+	ret = mpf_poll_status(priv, MPF_STATUS_READY);
 	if (ret < 0)
 		return ret;
 
-	return spi_write_then_read(spi, read_command, sizeof(read_command),
+	return spi_write_then_read(priv->spi, read_command, sizeof(read_command),
 				   rxbuf, rxbuf_size);
 }
 
@@ -242,7 +253,6 @@ static int mpf_ops_write_init(struct fpga_manager *mgr,
 	const u8 isc_en_command[] = { MPF_SPI_ISC_ENABLE };
 	struct mpf_priv *priv = mgr->priv;
 	struct device *dev = &mgr->dev;
-	struct spi_device *spi;
 	u32 isc_ret = 0;
 	int ret;
 
@@ -251,9 +261,7 @@ static int mpf_ops_write_init(struct fpga_manager *mgr,
 		return -EOPNOTSUPP;
 	}
 
-	spi = priv->spi;
-
-	ret = mpf_spi_write_then_read(spi, isc_en_command, sizeof(isc_en_command),
+	ret = mpf_spi_write_then_read(priv, isc_en_command, sizeof(isc_en_command),
 				      &isc_ret, sizeof(isc_ret));
 	if (ret || isc_ret) {
 		dev_err(dev, "Failed to enable ISC: spi_ret %d, isc_ret %u\n",
@@ -261,7 +269,7 @@ static int mpf_ops_write_init(struct fpga_manager *mgr,
 		return -EFAULT;
 	}
 
-	ret = mpf_spi_write(spi, program_mode, sizeof(program_mode));
+	ret = mpf_spi_write(priv, program_mode, sizeof(program_mode));
 	if (ret) {
 		dev_err(dev, "Failed to enter program mode: %d\n", ret);
 		return ret;
@@ -272,13 +280,32 @@ static int mpf_ops_write_init(struct fpga_manager *mgr,
 	return 0;
 }
 
+static int mpf_spi_frame_write(struct mpf_priv *priv, const char *buf)
+{
+	struct spi_transfer xfers[2] = {
+		{
+			.tx_buf = &priv->tx,
+			.len = 1,
+		}, {
+			.tx_buf = buf,
+			.len = MPF_SPI_FRAME_SIZE,
+		},
+	};
+	int ret;
+
+	ret = mpf_poll_status(priv, 0);
+	if (ret < 0)
+		return ret;
+
+	priv->tx = MPF_SPI_FRAME;
+
+	return spi_sync_transfer(priv->spi, xfers, ARRAY_SIZE(xfers));
+}
+
 static int mpf_ops_write(struct fpga_manager *mgr, const char *buf, size_t count)
 {
-	u8 spi_frame_command[] = { MPF_SPI_FRAME };
-	struct spi_transfer xfers[2] = { 0 };
 	struct mpf_priv *priv = mgr->priv;
 	struct device *dev = &mgr->dev;
-	struct spi_device *spi;
 	int ret, i;
 
 	if (count % MPF_SPI_FRAME_SIZE) {
@@ -287,19 +314,8 @@ static int mpf_ops_write(struct fpga_manager *mgr, const char *buf, size_t count
 		return -EINVAL;
 	}
 
-	spi = priv->spi;
-
-	xfers[0].tx_buf = spi_frame_command;
-	xfers[0].len = sizeof(spi_frame_command);
-
 	for (i = 0; i < count / MPF_SPI_FRAME_SIZE; i++) {
-		xfers[1].tx_buf = buf + i * MPF_SPI_FRAME_SIZE;
-		xfers[1].len = MPF_SPI_FRAME_SIZE;
-
-		ret = mpf_poll_status(spi, 0);
-		if (ret >= 0)
-			ret = spi_sync_transfer(spi, xfers, ARRAY_SIZE(xfers));
-
+		ret = mpf_spi_frame_write(priv, buf + i * MPF_SPI_FRAME_SIZE);
 		if (ret) {
 			dev_err(dev, "Failed to write bitstream frame %d/%zu\n",
 				i, count / MPF_SPI_FRAME_SIZE);
@@ -317,12 +333,9 @@ static int mpf_ops_write_complete(struct fpga_manager *mgr,
 	const u8 release_command[] = { MPF_SPI_RELEASE };
 	struct mpf_priv *priv = mgr->priv;
 	struct device *dev = &mgr->dev;
-	struct spi_device *spi;
 	int ret;
 
-	spi = priv->spi;
-
-	ret = mpf_spi_write(spi, isc_dis_command, sizeof(isc_dis_command));
+	ret = mpf_spi_write(priv, isc_dis_command, sizeof(isc_dis_command));
 	if (ret) {
 		dev_err(dev, "Failed to disable ISC: %d\n", ret);
 		return ret;
@@ -330,7 +343,7 @@ static int mpf_ops_write_complete(struct fpga_manager *mgr,
 
 	usleep_range(1000, 2000);
 
-	ret = mpf_spi_write(spi, release_command, sizeof(release_command));
+	ret = mpf_spi_write(priv, release_command, sizeof(release_command));
 	if (ret) {
 		dev_err(dev, "Failed to exit program mode: %d\n", ret);
 		return ret;