phy: phy-can-transceiver: Add dual channel support for TJA1048

- Introduce new flag CAN_TRANSCEIVER_DUAL_CH to indicate the phy has two
  channels.
- Alloc a phy for each channel
- Support TJA1048 which is a dual high-speed CAN transceiver with sleep
  mode supported.
- Add can_transceiver_phy_xlate for parsing phy

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://patch.msgid.link/20251001-can-v7-3-fad29efc3884@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: MrVan

drivers/phy/phy-can-transceiver.c

@@ -17,6 +17,7 @@ struct can_transceiver_data {
 	u32 flags;
 #define CAN_TRANSCEIVER_STB_PRESENT	BIT(0)
 #define CAN_TRANSCEIVER_EN_PRESENT	BIT(1)
+#define CAN_TRANSCEIVER_DUAL_CH		BIT(2)
 };
 
 struct can_transceiver_phy {
@@ -84,6 +85,10 @@ static const struct can_transceiver_data tcan1043_drvdata = {
 	.flags = CAN_TRANSCEIVER_STB_PRESENT | CAN_TRANSCEIVER_EN_PRESENT,
 };
 
+static const struct can_transceiver_data tja1048_drvdata = {
+	.flags = CAN_TRANSCEIVER_STB_PRESENT | CAN_TRANSCEIVER_DUAL_CH,
+};
+
 static const struct of_device_id can_transceiver_phy_ids[] = {
 	{
 		.compatible = "ti,tcan1042",
@@ -93,6 +98,10 @@ static const struct of_device_id can_transceiver_phy_ids[] = {
 		.compatible = "ti,tcan1043",
 		.data = &tcan1043_drvdata
 	},
+	{
+		.compatible = "nxp,tja1048",
+		.data = &tja1048_drvdata
+	},
 	{
 		.compatible = "nxp,tjr1443",
 		.data = &tcan1043_drvdata
@@ -111,6 +120,25 @@ devm_mux_state_get_optional(struct device *dev, const char *mux_name)
 	return devm_mux_state_get(dev, mux_name);
 }
 
+static struct phy *can_transceiver_phy_xlate(struct device *dev,
+					     const struct of_phandle_args *args)
+{
+	struct can_transceiver_priv *priv = dev_get_drvdata(dev);
+	u32 idx;
+
+	if (priv->num_ch == 1)
+		return priv->can_transceiver_phy[0].generic_phy;
+
+	if (args->args_count != 1)
+		return ERR_PTR(-EINVAL);
+
+	idx = args->args[0];
+	if (idx >= priv->num_ch)
+		return ERR_PTR(-EINVAL);
+
+	return priv->can_transceiver_phy[idx].generic_phy;
+}
+
 static int can_transceiver_phy_probe(struct platform_device *pdev)
 {
 	struct phy_provider *phy_provider;
@@ -124,57 +152,65 @@ static int can_transceiver_phy_probe(struct platform_device *pdev)
 	struct gpio_desc *enable_gpio;
 	struct mux_state *mux_state;
 	u32 max_bitrate = 0;
-	int err, num_ch = 1;
+	int err, i, num_ch = 1;
 
 	match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node);
 	drvdata = match->data;
+	if (drvdata->flags & CAN_TRANSCEIVER_DUAL_CH)
+		num_ch = 2;
 
 	priv = devm_kzalloc(dev, struct_size(priv, can_transceiver_phy, num_ch), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
 	priv->num_ch = num_ch;
 	platform_set_drvdata(pdev, priv);
-	can_transceiver_phy = &priv->can_transceiver_phy[0];
-	can_transceiver_phy->priv = priv;
 
 	mux_state = devm_mux_state_get_optional(dev, NULL);
 	if (IS_ERR(mux_state))
 		return PTR_ERR(mux_state);
 
 	priv->mux_state = mux_state;
 
-	phy = devm_phy_create(dev, dev->of_node,
-			      &can_transceiver_phy_ops);
-	if (IS_ERR(phy)) {
-		dev_err(dev, "failed to create can transceiver phy\n");
-		return PTR_ERR(phy);
-	}
-
 	err = device_property_read_u32(dev, "max-bitrate", &max_bitrate);
 	if ((err != -EINVAL) && !max_bitrate)
 		dev_warn(dev, "Invalid value for transceiver max bitrate. Ignoring bitrate limit\n");
-	phy->attrs.max_link_rate = max_bitrate;
 
-	can_transceiver_phy->generic_phy = phy;
+	for (i = 0; i < num_ch; i++) {
+		can_transceiver_phy = &priv->can_transceiver_phy[i];
+		can_transceiver_phy->priv = priv;
 
-	if (drvdata->flags & CAN_TRANSCEIVER_STB_PRESENT) {
-		standby_gpio = devm_gpiod_get_optional(dev, "standby", GPIOD_OUT_HIGH);
-		if (IS_ERR(standby_gpio))
-			return PTR_ERR(standby_gpio);
-		can_transceiver_phy->standby_gpio = standby_gpio;
-	}
+		phy = devm_phy_create(dev, dev->of_node, &can_transceiver_phy_ops);
+		if (IS_ERR(phy)) {
+			dev_err(dev, "failed to create can transceiver phy\n");
+			return PTR_ERR(phy);
+		}
 
-	if (drvdata->flags & CAN_TRANSCEIVER_EN_PRESENT) {
-		enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
-		if (IS_ERR(enable_gpio))
-			return PTR_ERR(enable_gpio);
-		can_transceiver_phy->enable_gpio = enable_gpio;
-	}
+		phy->attrs.max_link_rate = max_bitrate;
+
+		can_transceiver_phy->generic_phy = phy;
+		can_transceiver_phy->priv = priv;
 
-	phy_set_drvdata(can_transceiver_phy->generic_phy, can_transceiver_phy);
+		if (drvdata->flags & CAN_TRANSCEIVER_STB_PRESENT) {
+			standby_gpio = devm_gpiod_get_index_optional(dev, "standby", i,
+								     GPIOD_OUT_HIGH);
+			if (IS_ERR(standby_gpio))
+				return PTR_ERR(standby_gpio);
+			can_transceiver_phy->standby_gpio = standby_gpio;
+		}
+
+		if (drvdata->flags & CAN_TRANSCEIVER_EN_PRESENT) {
+			enable_gpio = devm_gpiod_get_index_optional(dev, "enable", i,
+								    GPIOD_OUT_LOW);
+			if (IS_ERR(enable_gpio))
+				return PTR_ERR(enable_gpio);
+			can_transceiver_phy->enable_gpio = enable_gpio;
+		}
+
+		phy_set_drvdata(can_transceiver_phy->generic_phy, can_transceiver_phy);
+	}
 
-	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+	phy_provider = devm_of_phy_provider_register(dev, can_transceiver_phy_xlate);
 
 	return PTR_ERR_OR_ZERO(phy_provider);
 }