net: mdio: realtek-rtl9300: use command runner for read_c22()

Convert the final missing read_c22() path to the new read enabled command
runner. Do it the same way as other implementations.

- bus calls otto_emdio_read_c22()
- this hands over to SoC specific otto_emdio_9300_read_c22()
- finally the registers are filled and the runner issued

With this cleanup remove the obsolete helper otto_emdio_wait_ready()

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260527163449.1294961-5-markus.stockhausen@gmx.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: plappermaul

drivers/net/mdio/mdio-realtek-rtl9300.c

@@ -97,7 +97,7 @@ struct otto_emdio_info {
 	u8 num_buses;
 	u8 num_ports;
 	u16 num_pages;
-	int (*read_c22)(struct mii_bus *bus, int phy_id, int regnum);
+	int (*read_c22)(struct mii_bus *bus, int port, int regnum, u32 *value);
 	int (*read_c45)(struct mii_bus *bus, int port, int dev_addr, int regnum, u32 *value);
 	int (*write_c22)(struct mii_bus *bus, int port, int regnum, u16 value);
 	int (*write_c45)(struct mii_bus *bus, int port, int dev_addr, int regnum, u16 value);
@@ -213,66 +213,17 @@ static int otto_emdio_write_cmd(struct mii_bus *bus, u32 cmd,
 	return otto_emdio_run_cmd(bus, cmd | priv->info->cmd_write, cmd_data);
 }
 
-static int otto_emdio_wait_ready(struct otto_emdio_priv *priv)
+static int otto_emdio_9300_read_c22(struct mii_bus *bus, int port, int regnum, u32 *value)
 {
-	struct regmap *regmap = priv->regmap;
-	u32 cmd_reg, val;
-
-	lockdep_assert_held(&priv->lock);
-	cmd_reg = priv->info->cmd_regs.c22_data; /* shared command/C22 register */
-
-	return regmap_read_poll_timeout(regmap, cmd_reg, val, !(val & PHY_CTRL_CMD), 10, 1000);
-}
-
-static int otto_emdio_9300_read_c22(struct mii_bus *bus, int phy_id, int regnum)
-{
-	struct otto_emdio_chan *chan = bus->priv;
-	struct otto_emdio_priv *priv;
-	u32 io_reg, cmd_reg, val;
-	struct regmap *regmap;
-	int port;
-	int err;
-
-	priv = chan->priv;
-	regmap = priv->regmap;
-	io_reg = priv->info->cmd_regs.io_data;
-	cmd_reg = priv->info->cmd_regs.c22_data; /* shared command/C22 register */
-
-	port = otto_emdio_phy_to_port(bus, phy_id);
-	if (port < 0)
-		return port;
-
-	mutex_lock(&priv->lock);
-	err = otto_emdio_wait_ready(priv);
-	if (err)
-		goto out_err;
-
-	err = regmap_write(regmap, io_reg, FIELD_PREP(PHY_CTRL_INDATA, port));
-	if (err)
-		goto out_err;
-
-	val = FIELD_PREP(PHY_CTRL_REG_ADDR, regnum) |
-	      FIELD_PREP(PHY_CTRL_PARK_PAGE, 0x1f) |
-	      FIELD_PREP(PHY_CTRL_MAIN_PAGE, RAW_PAGE(priv)) |
-	      PHY_CTRL_READ | PHY_CTRL_TYPE_C22 | PHY_CTRL_CMD;
-	err = regmap_write(regmap, cmd_reg, val);
-	if (err)
-		goto out_err;
-
-	err = otto_emdio_wait_ready(priv);
-	if (err)
-		goto out_err;
-
-	err = regmap_read(regmap, io_reg, &val);
-	if (err)
-		goto out_err;
-
-	mutex_unlock(&priv->lock);
-	return FIELD_GET(PHY_CTRL_DATA, val);
+	struct otto_emdio_priv *priv = otto_emdio_bus_to_priv(bus);
+	struct otto_emdio_cmd_regs cmd_data = {
+		.c22_data	= FIELD_PREP(PHY_CTRL_REG_ADDR, regnum) |
+				  FIELD_PREP(PHY_CTRL_PARK_PAGE, 0x1f) |
+				  FIELD_PREP(PHY_CTRL_MAIN_PAGE, RAW_PAGE(priv)),
+		.io_data	= FIELD_PREP(PHY_CTRL_INDATA, port),
+	};
 
-out_err:
-	mutex_unlock(&priv->lock);
-	return err;
+	return otto_emdio_read_cmd(bus, PHY_CTRL_TYPE_C22, &cmd_data, value);
 }
 
 static int otto_emdio_9300_write_c22(struct mii_bus *bus, int port, int regnum, u16 value)
@@ -314,6 +265,22 @@ static int otto_emdio_9300_write_c45(struct mii_bus *bus, int port,
 	return otto_emdio_write_cmd(bus, PHY_CTRL_TYPE_C45, &cmd_data);
 }
 
+static int otto_emdio_read_c22(struct mii_bus *bus, int phy_id, int regnum)
+{
+	struct otto_emdio_priv *priv = otto_emdio_bus_to_priv(bus);
+	int ret, port;
+	u32 value;
+
+	port = otto_emdio_phy_to_port(bus, phy_id);
+	if (port < 0)
+		return port;
+
+	scoped_guard(mutex, &priv->lock)
+		ret = priv->info->read_c22(bus, port, regnum, &value);
+
+	return ret ? ret : value;
+}
+
 static int otto_emdio_write_c22(struct mii_bus *bus, int phy_id, int regnum, u16 value)
 {
 	struct otto_emdio_priv *priv = otto_emdio_bus_to_priv(bus);
@@ -437,7 +404,7 @@ static int otto_emdio_probe_one(struct device *dev, struct otto_emdio_priv *priv
 		bus->read_c45 = otto_emdio_read_c45;
 		bus->write_c45 = otto_emdio_write_c45;
 	} else {
-		bus->read = priv->info->read_c22;
+		bus->read = otto_emdio_read_c22;
 		bus->write = otto_emdio_write_c22;
 	}
 	bus->parent = dev;