net: stmmac: dwmac-oxnas: Add support for OX810SE

Add support for OX810SE dwmac glue setup, which is a simplified version
of the OX820 introduced later with more control on the PHY interface.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c

@@ -12,6 +12,7 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/mfd/syscon.h>
@@ -48,46 +49,60 @@
 #define DWMAC_RX_VARDELAY(d)		((d) << DWMAC_RX_VARDELAY_SHIFT)
 #define DWMAC_RXN_VARDELAY(d)		((d) << DWMAC_RXN_VARDELAY_SHIFT)
 
+struct oxnas_dwmac;
+
+struct oxnas_dwmac_data {
+	int (*setup)(struct oxnas_dwmac *dwmac);
+};
+
 struct oxnas_dwmac {
 	struct device	*dev;
 	struct clk	*clk;
 	struct regmap	*regmap;
+	const struct oxnas_dwmac_data	*data;
 };
 
-static int oxnas_dwmac_init(struct platform_device *pdev, void *priv)
+static int oxnas_dwmac_setup_ox810se(struct oxnas_dwmac *dwmac)
 {
-	struct oxnas_dwmac *dwmac = priv;
 	unsigned int value;
 	int ret;
 
-	/* Reset HW here before changing the glue configuration */
-	ret = device_reset(dwmac->dev);
-	if (ret)
+	ret = regmap_read(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, &value);
+	if (ret < 0)
 		return ret;
 
-	ret = clk_prepare_enable(dwmac->clk);
-	if (ret)
-		return ret;
+	/* Enable GMII_GTXCLK to follow GMII_REFCLK, required for gigabit PHY */
+	value |= BIT(DWMAC_CKEN_GTX)		|
+		 /* Use simple mux for 25/125 Mhz clock switching */
+		 BIT(DWMAC_SIMPLE_MUX);
+
+	regmap_write(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, value);
+
+	return 0;
+}
+
+static int oxnas_dwmac_setup_ox820(struct oxnas_dwmac *dwmac)
+{
+	unsigned int value;
+	int ret;
 
 	ret = regmap_read(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, &value);
-	if (ret < 0) {
-		clk_disable_unprepare(dwmac->clk);
+	if (ret < 0)
 		return ret;
-	}
 
 	/* Enable GMII_GTXCLK to follow GMII_REFCLK, required for gigabit PHY */
 	value |= BIT(DWMAC_CKEN_GTX)		|
 		 /* Use simple mux for 25/125 Mhz clock switching */
-		 BIT(DWMAC_SIMPLE_MUX)		|
-		 /* set auto switch tx clock source */
-		 BIT(DWMAC_AUTO_TX_SOURCE)	|
-		 /* enable tx & rx vardelay */
-		 BIT(DWMAC_CKEN_TX_OUT)		|
-		 BIT(DWMAC_CKEN_TXN_OUT)	|
-		 BIT(DWMAC_CKEN_TX_IN)		|
-		 BIT(DWMAC_CKEN_RX_OUT)		|
-		 BIT(DWMAC_CKEN_RXN_OUT)	|
-		 BIT(DWMAC_CKEN_RX_IN);
+		BIT(DWMAC_SIMPLE_MUX)		|
+		/* set auto switch tx clock source */
+		BIT(DWMAC_AUTO_TX_SOURCE)	|
+		/* enable tx & rx vardelay */
+		BIT(DWMAC_CKEN_TX_OUT)		|
+		BIT(DWMAC_CKEN_TXN_OUT)	|
+		BIT(DWMAC_CKEN_TX_IN)		|
+		BIT(DWMAC_CKEN_RX_OUT)		|
+		BIT(DWMAC_CKEN_RXN_OUT)	|
+		BIT(DWMAC_CKEN_RX_IN);
 	regmap_write(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, value);
 
 	/* set tx & rx vardelay */
@@ -100,6 +115,27 @@ static int oxnas_dwmac_init(struct platform_device *pdev, void *priv)
 	return 0;
 }
 
+static int oxnas_dwmac_init(struct platform_device *pdev, void *priv)
+{
+	struct oxnas_dwmac *dwmac = priv;
+	int ret;
+
+	/* Reset HW here before changing the glue configuration */
+	ret = device_reset(dwmac->dev);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(dwmac->clk);
+	if (ret)
+		return ret;
+
+	ret = dwmac->data->setup(dwmac);
+	if (ret)
+		clk_disable_unprepare(dwmac->clk);
+
+	return ret;
+}
+
 static void oxnas_dwmac_exit(struct platform_device *pdev, void *priv)
 {
 	struct oxnas_dwmac *dwmac = priv;
@@ -128,6 +164,12 @@ static int oxnas_dwmac_probe(struct platform_device *pdev)
 		goto err_remove_config_dt;
 	}
 
+	dwmac->data = (const struct oxnas_dwmac_data *)of_device_get_match_data(&pdev->dev);
+	if (!dwmac->data) {
+		ret = -EINVAL;
+		goto err_remove_config_dt;
+	}
+
 	dwmac->dev = &pdev->dev;
 	plat_dat->bsp_priv = dwmac;
 	plat_dat->init = oxnas_dwmac_init;
@@ -166,8 +208,23 @@ static int oxnas_dwmac_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static const struct oxnas_dwmac_data ox810se_dwmac_data = {
+	.setup = oxnas_dwmac_setup_ox810se,
+};
+
+static const struct oxnas_dwmac_data ox820_dwmac_data = {
+	.setup = oxnas_dwmac_setup_ox820,
+};
+
 static const struct of_device_id oxnas_dwmac_match[] = {
-	{ .compatible = "oxsemi,ox820-dwmac" },
+	{
+		.compatible = "oxsemi,ox810se-dwmac",
+		.data = &ox810se_dwmac_data,
+	},
+	{
+		.compatible = "oxsemi,ox820-dwmac",
+		.data = &ox820_dwmac_data,
+	},
 	{ }
 };
 MODULE_DEVICE_TABLE(of, oxnas_dwmac_match);