phy: phy-can-transceiver: Introduce can_transceiver_priv

To prepare for dual-channel phy support, introduce can_transceiver_priv as
a higher level encapsulation for phy.

No functional changes.

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-v7-2-fad29efc3884@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: MrVan

drivers/phy/phy-can-transceiver.c

@@ -23,17 +23,24 @@ struct can_transceiver_phy {
 	struct phy *generic_phy;
 	struct gpio_desc *standby_gpio;
 	struct gpio_desc *enable_gpio;
+	struct can_transceiver_priv *priv;
+};
+
+struct can_transceiver_priv {
 	struct mux_state *mux_state;
+	int num_ch;
+	struct can_transceiver_phy can_transceiver_phy[] __counted_by(num_ch);
 };
 
 /* Power on function */
 static int can_transceiver_phy_power_on(struct phy *phy)
 {
 	struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy);
+	struct can_transceiver_priv *priv = can_transceiver_phy->priv;
 	int ret;
 
-	if (can_transceiver_phy->mux_state) {
-		ret = mux_state_select(can_transceiver_phy->mux_state);
+	if (priv->mux_state) {
+		ret = mux_state_select(priv->mux_state);
 		if (ret) {
 			dev_err(&phy->dev, "Failed to select CAN mux: %d\n", ret);
 			return ret;
@@ -51,13 +58,14 @@ static int can_transceiver_phy_power_on(struct phy *phy)
 static int can_transceiver_phy_power_off(struct phy *phy)
 {
 	struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy);
+	struct can_transceiver_priv *priv = can_transceiver_phy->priv;
 
 	if (can_transceiver_phy->standby_gpio)
 		gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 1);
 	if (can_transceiver_phy->enable_gpio)
 		gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 0);
-	if (can_transceiver_phy->mux_state)
-		mux_state_deselect(can_transceiver_phy->mux_state);
+	if (priv->mux_state)
+		mux_state_deselect(priv->mux_state);
 
 	return 0;
 }
@@ -108,27 +116,33 @@ static int can_transceiver_phy_probe(struct platform_device *pdev)
 	struct phy_provider *phy_provider;
 	struct device *dev = &pdev->dev;
 	struct can_transceiver_phy *can_transceiver_phy;
+	struct can_transceiver_priv *priv;
 	const struct can_transceiver_data *drvdata;
 	const struct of_device_id *match;
 	struct phy *phy;
 	struct gpio_desc *standby_gpio;
 	struct gpio_desc *enable_gpio;
 	struct mux_state *mux_state;
 	u32 max_bitrate = 0;
-	int err;
-
-	can_transceiver_phy = devm_kzalloc(dev, sizeof(struct can_transceiver_phy), GFP_KERNEL);
-	if (!can_transceiver_phy)
-		return -ENOMEM;
+	int err, num_ch = 1;
 
 	match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node);
 	drvdata = match->data;
 
+	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);
 
-	can_transceiver_phy->mux_state = mux_state;
+	priv->mux_state = mux_state;
 
 	phy = devm_phy_create(dev, dev->of_node,
 			      &can_transceiver_phy_ops);