Merge branch 'read-phy-address-of-switch-from-device-tree-on-mt7530-dsa-subdriver'

Arınç ÜNAL says:

====================
Read PHY address of switch from device tree on MT7530 DSA subdriver

This patch series makes the driver read the PHY address the switch listens
on from the device tree which, in result, brings support for MT7530
switches listening on a different PHY address than 31. And the patch series
simplifies the core operations.

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
====================

Link: https://lore.kernel.org/r/20240418-b4-for-netnext-mt7530-phy-addr-from-dt-and-simplify-core-ops-v3-0-3b5fb249b004@arinc9.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

3 files changed, 75 insertions, 84 deletions

diff --git a/drivers/net/dsa/mt7530-mdio.c b/drivers/net/dsa/mt7530-mdio.c
index fa3ee85a99c180..51df42ccdbe629 100644
--- a/drivers/net/dsa/mt7530-mdio.c
+++ b/drivers/net/dsa/mt7530-mdio.c
@@ -18,7 +18,8 @@
 static int
 mt7530_regmap_write(void *context, unsigned int reg, unsigned int val)
 {
-	struct mii_bus *bus = context;
+	struct mt7530_priv *priv = context;
+	struct mii_bus *bus = priv->bus;
 	u16 page, r, lo, hi;
 	int ret;
 
@@ -27,36 +28,35 @@ mt7530_regmap_write(void *context, unsigned int reg, unsigned int val)
 	lo = val & 0xffff;
 	hi = val >> 16;
 
-	/* MT7530 uses 31 as the pseudo port */
-	ret = bus->write(bus, 0x1f, 0x1f, page);
+	ret = bus->write(bus, priv->mdiodev->addr, 0x1f, page);
 	if (ret < 0)
 		return ret;
 
-	ret = bus->write(bus, 0x1f, r,  lo);
+	ret = bus->write(bus, priv->mdiodev->addr, r, lo);
 	if (ret < 0)
 		return ret;
 
-	ret = bus->write(bus, 0x1f, 0x10, hi);
+	ret = bus->write(bus, priv->mdiodev->addr, 0x10, hi);
 	return ret;
 }
 
 static int
 mt7530_regmap_read(void *context, unsigned int reg, unsigned int *val)
 {
-	struct mii_bus *bus = context;
+	struct mt7530_priv *priv = context;
+	struct mii_bus *bus = priv->bus;
 	u16 page, r, lo, hi;
 	int ret;
 
 	page = (reg >> 6) & 0x3ff;
 	r = (reg >> 2) & 0xf;
 
-	/* MT7530 uses 31 as the pseudo port */
-	ret = bus->write(bus, 0x1f, 0x1f, page);
+	ret = bus->write(bus, priv->mdiodev->addr, 0x1f, page);
 	if (ret < 0)
 		return ret;
 
-	lo = bus->read(bus, 0x1f, r);
-	hi = bus->read(bus, 0x1f, 0x10);
+	lo = bus->read(bus, priv->mdiodev->addr, r);
+	hi = bus->read(bus, priv->mdiodev->addr, 0x10);
 
 	*val = (hi << 16) | (lo & 0xffff);
 
@@ -107,8 +107,7 @@ mt7531_create_sgmii(struct mt7530_priv *priv)
 		mt7531_pcs_config[i]->unlock = mt7530_mdio_regmap_unlock;
 		mt7531_pcs_config[i]->lock_arg = &priv->bus->mdio_lock;
 
-		regmap = devm_regmap_init(priv->dev,
-					  &mt7530_regmap_bus, priv->bus,
+		regmap = devm_regmap_init(priv->dev, &mt7530_regmap_bus, priv,
 					  mt7531_pcs_config[i]);
 		if (IS_ERR(regmap)) {
 			ret = PTR_ERR(regmap);
@@ -153,6 +152,7 @@ mt7530_probe(struct mdio_device *mdiodev)
 
 	priv->bus = mdiodev->bus;
 	priv->dev = &mdiodev->dev;
+	priv->mdiodev = mdiodev;
 
 	ret = mt7530_probe_common(priv);
 	if (ret)
@@ -203,8 +203,8 @@ mt7530_probe(struct mdio_device *mdiodev)
 	regmap_config->reg_stride = 4;
 	regmap_config->max_register = MT7530_CREV;
 	regmap_config->disable_locking = true;
-	priv->regmap = devm_regmap_init(priv->dev, &mt7530_regmap_bus,
-					priv->bus, regmap_config);
+	priv->regmap = devm_regmap_init(priv->dev, &mt7530_regmap_bus, priv,
+					regmap_config);
 	if (IS_ERR(priv->regmap))
 		return PTR_ERR(priv->regmap);
 
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 5a4be833c05e53..04795ef8ebd774 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -74,108 +74,94 @@ static const struct mt7530_mib_desc mt7530_mib[] = {
 	MIB_DESC(1, 0xb8, "RxArlDrop"),
 };
 
-/* Since phy_device has not yet been created and
- * phy_{read,write}_mmd_indirect is not available, we provide our own
- * core_{read,write}_mmd_indirect with core_{clear,write,set} wrappers
- * to complete this function.
- */
-static int
-core_read_mmd_indirect(struct mt7530_priv *priv, int prtad, int devad)
+static void
+mt7530_mutex_lock(struct mt7530_priv *priv)
+{
+	if (priv->bus)
+		mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
+}
+
+static void
+mt7530_mutex_unlock(struct mt7530_priv *priv)
+{
+	if (priv->bus)
+		mutex_unlock(&priv->bus->mdio_lock);
+}
+
+static void
+core_write(struct mt7530_priv *priv, u32 reg, u32 val)
 {
 	struct mii_bus *bus = priv->bus;
-	int value, ret;
+	int ret;
+
+	mt7530_mutex_lock(priv);
 
 	/* Write the desired MMD Devad */
-	ret = bus->write(bus, 0, MII_MMD_CTRL, devad);
+	ret = bus->write(bus, MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr),
+			 MII_MMD_CTRL, MDIO_MMD_VEND2);
 	if (ret < 0)
 		goto err;
 
 	/* Write the desired MMD register address */
-	ret = bus->write(bus, 0, MII_MMD_DATA, prtad);
+	ret = bus->write(bus, MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr),
+			 MII_MMD_DATA, reg);
 	if (ret < 0)
 		goto err;
 
 	/* Select the Function : DATA with no post increment */
-	ret = bus->write(bus, 0, MII_MMD_CTRL, (devad | MII_MMD_CTRL_NOINCR));
+	ret = bus->write(bus, MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr),
+			 MII_MMD_CTRL, MDIO_MMD_VEND2 | MII_MMD_CTRL_NOINCR);
 	if (ret < 0)
 		goto err;
 
-	/* Read the content of the MMD's selected register */
-	value = bus->read(bus, 0, MII_MMD_DATA);
-
-	return value;
+	/* Write the data into MMD's selected register */
+	ret = bus->write(bus, MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr),
+			 MII_MMD_DATA, val);
 err:
-	dev_err(&bus->dev,  "failed to read mmd register\n");
+	if (ret < 0)
+		dev_err(&bus->dev, "failed to write mmd register\n");
 
-	return ret;
+	mt7530_mutex_unlock(priv);
 }
 
-static int
-core_write_mmd_indirect(struct mt7530_priv *priv, int prtad,
-			int devad, u32 data)
+static void
+core_rmw(struct mt7530_priv *priv, u32 reg, u32 mask, u32 set)
 {
 	struct mii_bus *bus = priv->bus;
+	u32 val;
 	int ret;
 
+	mt7530_mutex_lock(priv);
+
 	/* Write the desired MMD Devad */
-	ret = bus->write(bus, 0, MII_MMD_CTRL, devad);
+	ret = bus->write(bus, MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr),
+			 MII_MMD_CTRL, MDIO_MMD_VEND2);
 	if (ret < 0)
 		goto err;
 
 	/* Write the desired MMD register address */
-	ret = bus->write(bus, 0, MII_MMD_DATA, prtad);
+	ret = bus->write(bus, MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr),
+			 MII_MMD_DATA, reg);
 	if (ret < 0)
 		goto err;
 
 	/* Select the Function : DATA with no post increment */
-	ret = bus->write(bus, 0, MII_MMD_CTRL, (devad | MII_MMD_CTRL_NOINCR));
+	ret = bus->write(bus, MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr),
+			 MII_MMD_CTRL, MDIO_MMD_VEND2 | MII_MMD_CTRL_NOINCR);
 	if (ret < 0)
 		goto err;
 
+	/* Read the content of the MMD's selected register */
+	val = bus->read(bus, MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr),
+			MII_MMD_DATA);
+	val &= ~mask;
+	val |= set;
 	/* Write the data into MMD's selected register */
-	ret = bus->write(bus, 0, MII_MMD_DATA, data);
+	ret = bus->write(bus, MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr),
+			 MII_MMD_DATA, val);
 err:
 	if (ret < 0)
-		dev_err(&bus->dev,
-			"failed to write mmd register\n");
-	return ret;
-}
-
-static void
-mt7530_mutex_lock(struct mt7530_priv *priv)
-{
-	if (priv->bus)
-		mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
-}
-
-static void
-mt7530_mutex_unlock(struct mt7530_priv *priv)
-{
-	if (priv->bus)
-		mutex_unlock(&priv->bus->mdio_lock);
-}
-
-static void
-core_write(struct mt7530_priv *priv, u32 reg, u32 val)
-{
-	mt7530_mutex_lock(priv);
-
-	core_write_mmd_indirect(priv, reg, MDIO_MMD_VEND2, val);
-
-	mt7530_mutex_unlock(priv);
-}
-
-static void
-core_rmw(struct mt7530_priv *priv, u32 reg, u32 mask, u32 set)
-{
-	u32 val;
-
-	mt7530_mutex_lock(priv);
-
-	val = core_read_mmd_indirect(priv, reg, MDIO_MMD_VEND2);
-	val &= ~mask;
-	val |= set;
-	core_write_mmd_indirect(priv, reg, MDIO_MMD_VEND2, val);
+		dev_err(&bus->dev, "failed to write mmd register\n");
 
 	mt7530_mutex_unlock(priv);
 }
@@ -2679,16 +2665,19 @@ mt7531_setup(struct dsa_switch *ds)
 	 * phy_[read,write]_mmd_indirect is called, we provide our own
 	 * mt7531_ind_mmd_phy_[read,write] to complete this function.
 	 */
-	val = mt7531_ind_c45_phy_read(priv, MT753X_CTRL_PHY_ADDR,
+	val = mt7531_ind_c45_phy_read(priv,
+				      MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr),
 				      MDIO_MMD_VEND2, CORE_PLL_GROUP4);
 	val |= MT7531_RG_SYSPLL_DMY2 | MT7531_PHY_PLL_BYPASS_MODE;
 	val &= ~MT7531_PHY_PLL_OFF;
-	mt7531_ind_c45_phy_write(priv, MT753X_CTRL_PHY_ADDR, MDIO_MMD_VEND2,
-				 CORE_PLL_GROUP4, val);
+	mt7531_ind_c45_phy_write(priv,
+				 MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr),
+				 MDIO_MMD_VEND2, CORE_PLL_GROUP4, val);
 
 	/* Disable EEE advertisement on the switch PHYs. */
-	for (i = MT753X_CTRL_PHY_ADDR;
-	     i < MT753X_CTRL_PHY_ADDR + MT7530_NUM_PHYS; i++) {
+	for (i = MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr);
+	     i < MT753X_CTRL_PHY_ADDR(priv->mdiodev->addr) + MT7530_NUM_PHYS;
+	     i++) {
 		mt7531_ind_c45_phy_write(priv, i, MDIO_MMD_AN, MDIO_AN_EEE_ADV,
 					 0);
 	}
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index a08053390b285e..94932c3dbde92e 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -629,7 +629,7 @@ enum mt7531_clk_skew {
 #define  MT7531_PHY_PLL_OFF		BIT(5)
 #define  MT7531_PHY_PLL_BYPASS_MODE	BIT(4)
 
-#define MT753X_CTRL_PHY_ADDR		0
+#define MT753X_CTRL_PHY_ADDR(addr)	((addr + 1) & 0x1f)
 
 #define CORE_PLL_GROUP5			0x404
 #define  RG_LCDDS_PCW_NCPO1(x)		((x) & 0xffff)
@@ -778,6 +778,7 @@ struct mt753x_info {
  * @irq_enable:		IRQ enable bits, synced to SYS_INT_EN
  * @create_sgmii:	Pointer to function creating SGMII PCS instance(s)
  * @active_cpu_ports:	Holding the active CPU ports
+ * @mdiodev:		The pointer to the MDIO device structure
  */
 struct mt7530_priv {
 	struct device		*dev;
@@ -804,6 +805,7 @@ struct mt7530_priv {
 	u32 irq_enable;
 	int (*create_sgmii)(struct mt7530_priv *priv);
 	u8 active_cpu_ports;
+	struct mdio_device *mdiodev;
 };
 
 struct mt7530_hw_vlan_entry {