phy: socionext: Add UniPhier USB3 PHY driver

Add USB3 PHY driver support to control clocks and resets needed to enable
PHY. The phy_ops->init() and exit() control PHY clocks and resets only,
and clocks and resets for the controller and the parent logic are enabled
in advance.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Reviewed-by: Marek Vasut <marex@denx.de>

drivers/phy/socionext/Kconfig

@@ -10,3 +10,11 @@ config PHY_UNIPHIER_PCIE
 	help
 	  Enable this to support PHY implemented in PCIe controller
 	  on UniPhier SoCs.
+
+config PHY_UNIPHIER_USB3
+	bool "UniPhier USB3 PHY driver"
+	depends on PHY && ARCH_UNIPHIER
+	imply REGMAP
+	help
+	  Enable this to support PHY implemented in USB3 controller
+	  on UniPhier SoCs.

drivers/phy/socionext/Makefile

@@ -4,3 +4,4 @@
 #
 
 obj-$(CONFIG_PHY_UNIPHIER_PCIE)	+= phy-uniphier-pcie.o
+obj-$(CONFIG_PHY_UNIPHIER_USB3)	+= phy-uniphier-usb3.o

drivers/phy/socionext/phy-uniphier-usb3.c

@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * phy_uniphier_usb3.c - Socionext UniPhier Usb3 PHY driver
+ * Copyright 2019-2023 Socionext, Inc.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <generic-phy.h>
+
+#include <clk.h>
+#include <reset.h>
+
+struct uniphier_usb3phy_priv {
+	struct clk *clk_link, *clk_phy, *clk_parent, *clk_phyext;
+	struct reset_ctl *rst_link, *rst_phy, *rst_parent;
+};
+
+static int uniphier_usb3phy_init(struct phy *phy)
+{
+	struct uniphier_usb3phy_priv *priv = dev_get_priv(phy->dev);
+	int ret;
+
+	ret = clk_enable(priv->clk_phy);
+	if (ret)
+		return ret;
+
+	ret = reset_deassert(priv->rst_phy);
+	if (ret)
+		goto out_clk;
+
+	if (priv->clk_phyext) {
+		ret = clk_enable(priv->clk_phyext);
+		if (ret)
+			goto out_rst;
+	}
+
+	return 0;
+
+out_rst:
+	reset_assert(priv->rst_phy);
+out_clk:
+	clk_disable(priv->clk_phy);
+
+	return ret;
+}
+
+static int uniphier_usb3phy_exit(struct phy *phy)
+{
+	struct uniphier_usb3phy_priv *priv = dev_get_priv(phy->dev);
+
+	if (priv->clk_phyext)
+		clk_disable(priv->clk_phyext);
+
+	reset_assert(priv->rst_phy);
+	clk_disable(priv->clk_phy);
+
+	return 0;
+}
+
+static int uniphier_usb3phy_probe(struct udevice *dev)
+{
+	struct uniphier_usb3phy_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	priv->clk_link = devm_clk_get(dev, "link");
+	if (IS_ERR(priv->clk_link)) {
+		printf("Failed to get link clock\n");
+		return PTR_ERR(priv->clk_link);
+	}
+
+	priv->clk_phy = devm_clk_get(dev, "phy");
+	if (IS_ERR(priv->clk_link)) {
+		printf("Failed to get phy clock\n");
+		return PTR_ERR(priv->clk_link);
+	}
+
+	priv->clk_parent = devm_clk_get_optional(dev, "gio");
+	if (IS_ERR(priv->clk_parent)) {
+		printf("Failed to get parent clock\n");
+		return PTR_ERR(priv->clk_parent);
+	}
+
+	priv->clk_phyext = devm_clk_get_optional(dev, "phy-ext");
+	if (IS_ERR(priv->clk_phyext)) {
+		printf("Failed to get external phy clock\n");
+		return PTR_ERR(priv->clk_phyext);
+	}
+
+	priv->rst_link = devm_reset_control_get(dev, "link");
+	if (IS_ERR(priv->rst_link)) {
+		printf("Failed to get link reset\n");
+		return PTR_ERR(priv->rst_link);
+	}
+
+	priv->rst_phy = devm_reset_control_get(dev, "phy");
+	if (IS_ERR(priv->rst_phy)) {
+		printf("Failed to get phy reset\n");
+		return PTR_ERR(priv->rst_phy);
+	}
+
+	priv->rst_parent = devm_reset_control_get_optional(dev, "gio");
+	if (IS_ERR(priv->rst_parent)) {
+		printf("Failed to get parent reset\n");
+		return PTR_ERR(priv->rst_parent);
+	}
+
+	if (priv->clk_parent) {
+		ret = clk_enable(priv->clk_parent);
+		if (ret)
+			return ret;
+	}
+	if (priv->rst_parent) {
+		ret = reset_deassert(priv->rst_parent);
+		if (ret)
+			goto out_clk_parent;
+	}
+
+	ret = clk_enable(priv->clk_link);
+	if (ret)
+		goto out_rst_parent;
+
+	ret = reset_deassert(priv->rst_link);
+	if (ret)
+		goto out_clk;
+
+	return 0;
+
+out_clk:
+	clk_disable(priv->clk_link);
+out_rst_parent:
+	if (priv->rst_parent)
+		reset_assert(priv->rst_parent);
+out_clk_parent:
+	if (priv->clk_parent)
+		clk_disable(priv->clk_parent);
+
+	return ret;
+}
+
+static struct phy_ops uniphier_usb3phy_ops = {
+	.init = uniphier_usb3phy_init,
+	.exit = uniphier_usb3phy_exit,
+};
+
+static const struct udevice_id uniphier_usb3phy_ids[] = {
+	{ .compatible = "socionext,uniphier-pro4-usb3-ssphy" },
+	{ .compatible = "socionext,uniphier-pro5-usb3-hsphy" },
+	{ .compatible = "socionext,uniphier-pro5-usb3-ssphy" },
+	{ .compatible = "socionext,uniphier-pxs2-usb3-hsphy" },
+	{ .compatible = "socionext,uniphier-pxs2-usb3-ssphy" },
+	{ .compatible = "socionext,uniphier-ld20-usb3-hsphy" },
+	{ .compatible = "socionext,uniphier-ld20-usb3-ssphy" },
+	{ .compatible = "socionext,uniphier-pxs3-usb3-hsphy" },
+	{ .compatible = "socionext,uniphier-pxs3-usb3-ssphy" },
+	{ .compatible = "socionext,uniphier-nx1-usb3-hsphy" },
+	{ .compatible = "socionext,uniphier-nx1-usb3-ssphy" },
+	{ }
+};
+
+U_BOOT_DRIVER(uniphier_usb3_phy) = {
+	.name		= "uniphier-usb3-phy",
+	.id		= UCLASS_PHY,
+	.of_match	= uniphier_usb3phy_ids,
+	.ops		= &uniphier_usb3phy_ops,
+	.probe		= uniphier_usb3phy_probe,
+	.priv_auto      = sizeof(struct uniphier_usb3phy_priv),
+};