phy: usb: sunxi: Introduce Allwinner A31 USB PHY support

The USB phy controller in the A31 differs mostly from the older controllers
because it has a clock dedicated for each phy, while the older ones were having
a single clock for all the phys.

Signed-off-by: Maxime Ripard <[e-mail]>
Reviewed-by: Hans de Goede <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/phy-sun4i-usb.c

···
 #define MAX_PHYS			3
 
 struct sun4i_usb_phy_data {
-	struct clk *clk;
 	void __iomem *base;
 	struct mutex mutex;
 	int num_phys;
···
 		void __iomem *pmu;
 		struct regulator *vbus;
 		struct reset_control *reset;
+		struct clk *clk;
 		int index;
 	} phys[MAX_PHYS];
 };
···
 	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
 	int ret;
 
-	ret = clk_prepare_enable(data->clk);
+	ret = clk_prepare_enable(phy->clk);
 	if (ret)
 		return ret;
 
 	ret = reset_control_deassert(phy->reset);
 	if (ret) {
-		clk_disable_unprepare(data->clk);
+		clk_disable_unprepare(phy->clk);
 		return ret;
 	}
 
···
 static int sun4i_usb_phy_exit(struct phy *_phy)
 {
 	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
-	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
 
 	sun4i_usb_phy_passby(phy, 0);
 	reset_control_assert(phy->reset);
-	clk_disable_unprepare(data->clk);
+	clk_disable_unprepare(phy->clk);
 
 	return 0;
 }
···
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	struct phy_provider *phy_provider;
+	bool dedicated_clocks;
 	struct resource *res;
 	int i;
 
···
 	else
 		data->disc_thresh = 2;
 
+	if (of_device_is_compatible(np, "allwinner,sun6i-a31-usb-phy"))
+		dedicated_clocks = true;
+	else
+		dedicated_clocks = false;
+
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
 	data->base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(data->base))
 		return PTR_ERR(data->base);
-
-	data->clk = devm_clk_get(dev, "usb_phy");
-	if (IS_ERR(data->clk)) {
-		dev_err(dev, "could not get usb_phy clock\n");
-		return PTR_ERR(data->clk);
-	}
 
 	/* Skip 0, 0 is the phy for otg which is not yet supported. */
 	for (i = 1; i < data->num_phys; i++) {
···
 			if (PTR_ERR(phy->vbus) == -EPROBE_DEFER)
 				return -EPROBE_DEFER;
 			phy->vbus = NULL;
+		}
+
+		if (dedicated_clocks)
+			snprintf(name, sizeof(name), "usb%d_phy", i);
+		else
+			strlcpy(name, "usb_phy", sizeof(name));
+
+		phy->clk = devm_clk_get(dev, name);
+		if (IS_ERR(phy->clk)) {
+			dev_err(dev, "failed to get clock %s\n", name);
+			return PTR_ERR(phy->clk);
 		}
 
 		snprintf(name, sizeof(name), "usb%d_reset", i);
···
 static const struct of_device_id sun4i_usb_phy_of_match[] = {
 	{ .compatible = "allwinner,sun4i-a10-usb-phy" },
 	{ .compatible = "allwinner,sun5i-a13-usb-phy" },
+	{ .compatible = "allwinner,sun6i-a31-usb-phy" },
 	{ .compatible = "allwinner,sun7i-a20-usb-phy" },
 	{ },
 };