net: stmmac: dwmac-qcom-ethqos: add support for the phyaux clock

On sa8775p, the EMAC revision is 4 and we use SGMII instead of RGMII.
There's no "rgmii" clock but there's a fourth clock under a different
name: "phyaux". Add a new field to the chip data struct that specifies
the link clock name. Default to "rgmii" for backward compatibility.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Bartosz Golaszewski

drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c

@@ -85,15 +85,16 @@ struct ethqos_emac_driver_data {
 	unsigned int num_por;
 	bool rgmii_config_loopback_en;
 	bool has_emac3;
+	const char *link_clk_name;
 	struct dwmac4_addrs dwmac4_addrs;
 };
 
 struct qcom_ethqos {
 	struct platform_device *pdev;
 	void __iomem *rgmii_base;
 
-	unsigned int rgmii_clk_rate;
-	struct clk *rgmii_clk;
+	unsigned int link_clk_rate;
+	struct clk *link_clk;
 	struct phy *serdes_phy;
 	unsigned int speed;
 
@@ -156,23 +157,23 @@ static void rgmii_dump(void *priv)
 #define RGMII_ID_MODE_10_LOW_SVS_CLK_FREQ	  (5 * 1000 * 1000UL)
 
 static void
-ethqos_update_rgmii_clk(struct qcom_ethqos *ethqos, unsigned int speed)
+ethqos_update_link_clk(struct qcom_ethqos *ethqos, unsigned int speed)
 {
 	switch (speed) {
 	case SPEED_1000:
-		ethqos->rgmii_clk_rate =  RGMII_1000_NOM_CLK_FREQ;
+		ethqos->link_clk_rate =  RGMII_1000_NOM_CLK_FREQ;
 		break;
 
 	case SPEED_100:
-		ethqos->rgmii_clk_rate =  RGMII_ID_MODE_100_LOW_SVS_CLK_FREQ;
+		ethqos->link_clk_rate =  RGMII_ID_MODE_100_LOW_SVS_CLK_FREQ;
 		break;
 
 	case SPEED_10:
-		ethqos->rgmii_clk_rate =  RGMII_ID_MODE_10_LOW_SVS_CLK_FREQ;
+		ethqos->link_clk_rate =  RGMII_ID_MODE_10_LOW_SVS_CLK_FREQ;
 		break;
 	}
 
-	clk_set_rate(ethqos->rgmii_clk, ethqos->rgmii_clk_rate);
+	clk_set_rate(ethqos->link_clk, ethqos->link_clk_rate);
 }
 
 static void ethqos_set_func_clk_en(struct qcom_ethqos *ethqos)
@@ -563,7 +564,7 @@ static void ethqos_fix_mac_speed(void *priv, unsigned int speed)
 	struct qcom_ethqos *ethqos = priv;
 
 	ethqos->speed = speed;
-	ethqos_update_rgmii_clk(ethqos, speed);
+	ethqos_update_link_clk(ethqos, speed);
 	ethqos_configure(ethqos);
 }
 
@@ -597,9 +598,9 @@ static int ethqos_clks_config(void *priv, bool enabled)
 	int ret = 0;
 
 	if (enabled) {
-		ret = clk_prepare_enable(ethqos->rgmii_clk);
+		ret = clk_prepare_enable(ethqos->link_clk);
 		if (ret) {
-			dev_err(&ethqos->pdev->dev, "rgmii_clk enable failed\n");
+			dev_err(&ethqos->pdev->dev, "link_clk enable failed\n");
 			return ret;
 		}
 
@@ -610,7 +611,7 @@ static int ethqos_clks_config(void *priv, bool enabled)
 		 */
 		ethqos_set_func_clk_en(ethqos);
 	} else {
-		clk_disable_unprepare(ethqos->rgmii_clk);
+		clk_disable_unprepare(ethqos->link_clk);
 	}
 
 	return ret;
@@ -662,9 +663,9 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
 	ethqos->rgmii_config_loopback_en = data->rgmii_config_loopback_en;
 	ethqos->has_emac3 = data->has_emac3;
 
-	ethqos->rgmii_clk = devm_clk_get(dev, "rgmii");
-	if (IS_ERR(ethqos->rgmii_clk)) {
-		ret = PTR_ERR(ethqos->rgmii_clk);
+	ethqos->link_clk = devm_clk_get(dev, data->link_clk_name ?: "rgmii");
+	if (IS_ERR(ethqos->link_clk)) {
+		ret = PTR_ERR(ethqos->link_clk);
 		goto out_config_dt;
 	}
 
@@ -683,7 +684,7 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
 	}
 
 	ethqos->speed = SPEED_1000;
-	ethqos_update_rgmii_clk(ethqos, SPEED_1000);
+	ethqos_update_link_clk(ethqos, SPEED_1000);
 	ethqos_set_func_clk_en(ethqos);
 
 	plat_dat->bsp_priv = ethqos;