i2c: rtl9300: rename internal sda_pin to sda_num

Rename the internally used 'sda_pin' to 'sda_num' to make it clear that
this is NOT the actual pin number of the GPIO pin but rather the logical
SDA channel number. Although the alternate function SDA_Y is sometimes
given with the GPIO number, this is not always the case. Thus, avoid any
confusion or misconfiguration by giving the variable the correct name.

This follows the description change in the devicetree bindings.

Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Tested-by: Sven Eckelmann <sven@narfation.org>
Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Tested-by: Chris Packham <chris.packham@alliedtelesis.co.nz> # On RTL9302C based board
Tested-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20250927101931.71575-4-jelonek.jonas@gmail.com

Author: jonasjelonek

drivers/i2c/busses/i2c-rtl9300.c

@@ -20,7 +20,7 @@ struct rtl9300_i2c_chan {
 	struct i2c_adapter adap;
 	struct rtl9300_i2c *i2c;
 	enum rtl9300_bus_freq bus_freq;
-	u8 sda_pin;
+	u8 sda_num;
 };
 
 enum rtl9300_i2c_reg_scope {
@@ -67,7 +67,7 @@ struct rtl9300_i2c {
 	struct regmap_field *fields[F_NUM_FIELDS];
 	u32 reg_base;
 	u32 data_reg;
-	u8 sda_pin;
+	u8 sda_num;
 	struct mutex lock;
 };
 
@@ -102,11 +102,11 @@ static int rtl9300_i2c_config_io(struct rtl9300_i2c *i2c, u8 sda_pin)
 
 	drv_data = (struct rtl9300_i2c_drv_data *)device_get_match_data(i2c->dev);
 
-	ret = regmap_field_update_bits(i2c->fields[F_SDA_SEL], BIT(sda_pin), BIT(sda_pin));
+	ret = regmap_field_update_bits(i2c->fields[F_SDA_SEL], BIT(sda_num), BIT(sda_num));
 	if (ret)
 		return ret;
 
-	ret = regmap_field_write(i2c->fields[F_SDA_OUT_SEL], sda_pin);
+	ret = regmap_field_write(i2c->fields[F_SDA_OUT_SEL], sda_num);
 	if (ret)
 		return ret;
 
@@ -243,11 +243,11 @@ static int rtl9300_i2c_smbus_xfer(struct i2c_adapter *adap, u16 addr, unsigned s
 	int len = 0, ret;
 
 	mutex_lock(&i2c->lock);
-	if (chan->sda_pin != i2c->sda_pin) {
+	if (chan->sda_num != i2c->sda_num) {
 		ret = rtl9300_i2c_config_io(i2c, chan->sda_pin);
 		if (ret)
 			goto out_unlock;
-		i2c->sda_pin = chan->sda_pin;
+		i2c->sda_num = chan->sda_num;
 	}
 
 	switch (size) {
@@ -374,7 +374,7 @@ static int rtl9300_i2c_probe(struct platform_device *pdev)
 	struct fwnode_handle *child;
 	struct rtl9300_i2c_drv_data *drv_data;
 	struct reg_field fields[F_NUM_FIELDS];
-	u32 clock_freq, sda_pin;
+	u32 clock_freq, sda_num;
 	int ret, i = 0;
 
 	i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);
@@ -414,7 +414,7 @@ static int rtl9300_i2c_probe(struct platform_device *pdev)
 		struct rtl9300_i2c_chan *chan = &i2c->chans[i];
 		struct i2c_adapter *adap = &chan->adap;
 
-		ret = fwnode_property_read_u32(child, "reg", &sda_pin);
+		ret = fwnode_property_read_u32(child, "reg", &sda_num);
 		if (ret)
 			return ret;
 
@@ -431,11 +431,11 @@ static int rtl9300_i2c_probe(struct platform_device *pdev)
 			break;
 		default:
 			dev_warn(i2c->dev, "SDA%d clock-frequency %d not supported using default\n",
-				 sda_pin, clock_freq);
+				 sda_num, clock_freq);
 			break;
 		}
 
-		chan->sda_pin = sda_pin;
+		chan->sda_num = sda_num;
 		chan->i2c = i2c;
 		adap = &i2c->chans[i].adap;
 		adap->owner = THIS_MODULE;
@@ -445,14 +445,14 @@ static int rtl9300_i2c_probe(struct platform_device *pdev)
 		adap->dev.parent = dev;
 		i2c_set_adapdata(adap, chan);
 		adap->dev.of_node = to_of_node(child);
-		snprintf(adap->name, sizeof(adap->name), "%s SDA%d\n", dev_name(dev), sda_pin);
+		snprintf(adap->name, sizeof(adap->name), "%s SDA%d\n", dev_name(dev), sda_num);
 		i++;
 
 		ret = devm_i2c_add_adapter(dev, adap);
 		if (ret)
 			return ret;
 	}
-	i2c->sda_pin = 0xff;
+	i2c->sda_num = 0xff;
 
 	return 0;
 }