phy: add USB PHY driver for MediaTek MT7620 SoC

This patch adds USB PHY driver for MediaTek MT7620 SoC

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>

drivers/phy/Kconfig

@@ -218,6 +218,13 @@ config KEYSTONE_USB_PHY
 
 	  This PHY is found on some Keystone (K2) devices supporting USB.
 
+config MT7620_USB_PHY
+	bool "MediaTek MT7620 USB PHY support"
+	depends on PHY
+	depends on SOC_MT7620
+	help
+          Support the intergated USB PHY in MediaTek MT7620 SoC
+
 config MT76X8_USB_PHY
 	bool "MediaTek MT76x8 (7628/88) USB PHY support"
 	depends on PHY

drivers/phy/Makefile

@@ -24,6 +24,7 @@ obj-$(CONFIG_MESON_G12A_USB_PHY) += meson-g12a-usb2.o meson-g12a-usb3-pcie.o
 obj-$(CONFIG_MSM8916_USB_PHY) += msm8916-usbh-phy.o
 obj-$(CONFIG_OMAP_USB2_PHY) += omap-usb2-phy.o
 obj-$(CONFIG_KEYSTONE_USB_PHY) += keystone-usb-phy.o
+obj-$(CONFIG_MT7620_USB_PHY) += mt7620-usb-phy.o
 obj-$(CONFIG_MT76X8_USB_PHY) += mt76x8-usb-phy.o
 obj-$(CONFIG_PHY_DA8XX_USB) += phy-da8xx-usb.o
 obj-$(CONFIG_PHY_MTK_TPHY) += phy-mtk-tphy.o

drivers/phy/mt7620-usb-phy.c

@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <weijie.gao@mediatek.com>
+ */
+
+#include <clk.h>
+#include <dm.h>
+#include <generic-phy.h>
+#include <misc.h>
+#include <reset.h>
+#include <dm/device_compat.h>
+#include <linux/delay.h>
+#include <mach/mt7620-sysc.h>
+
+struct mt7620_usb_phy {
+	struct udevice *sysc;
+	struct clk_bulk clocks;
+	struct reset_ctl_bulk resets;
+};
+
+static int mt7620_usb_phy_power_on(struct phy *_phy)
+{
+	struct mt7620_usb_phy *phy = dev_get_priv(_phy->dev);
+	u32 mode = MT7620_SYSC_USB_HOST_MODE;
+	int ret;
+
+	reset_deassert_bulk(&phy->resets);
+
+	clk_enable_bulk(&phy->clocks);
+
+	mdelay(10);
+
+	ret = misc_ioctl(phy->sysc, MT7620_SYSC_IOCTL_SET_USB_MODE, &mode);
+	if (ret) {
+		dev_err(_phy->dev,
+			"mt7620_usbphy: failed to set USB host mode\n");
+		return ret;
+	}
+
+	mdelay(10);
+
+	return 0;
+}
+
+static int mt7620_usb_phy_power_off(struct phy *_phy)
+{
+	struct mt7620_usb_phy *phy = dev_get_priv(_phy->dev);
+
+	clk_disable_bulk(&phy->clocks);
+
+	reset_assert_bulk(&phy->resets);
+
+	return 0;
+}
+
+static int mt7620_usb_phy_probe(struct udevice *dev)
+{
+	struct mt7620_usb_phy *phy = dev_get_priv(dev);
+	struct ofnode_phandle_args sysc_args;
+	int ret;
+
+	ret = ofnode_parse_phandle_with_args(dev_ofnode(dev), "mediatek,sysc", NULL,
+					     0, 0, &sysc_args);
+	if (ret) {
+		dev_err(dev, "mt7620_usbphy: sysc property not found\n");
+		return ret;
+	}
+
+	ret = uclass_get_device_by_ofnode(UCLASS_MISC, sysc_args.node,
+					  &phy->sysc);
+	if (ret) {
+		dev_err(dev, "mt7620_usbphy: failed to sysc device\n");
+		return ret;
+	}
+
+	ret = clk_get_bulk(dev, &phy->clocks);
+	if (ret) {
+		dev_err(dev, "mt7620_usbphy: failed to get clocks\n");
+		return ret;
+	}
+
+	ret = reset_get_bulk(dev, &phy->resets);
+	if (ret) {
+		dev_err(dev, "mt7620_usbphy: failed to get reset control\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct phy_ops mt7620_usb_phy_ops = {
+	.power_on = mt7620_usb_phy_power_on,
+	.power_off = mt7620_usb_phy_power_off,
+};
+
+static const struct udevice_id mt7620_usb_phy_ids[] = {
+	{ .compatible = "mediatek,mt7620-usbphy" },
+	{ }
+};
+
+U_BOOT_DRIVER(mt7620_usb_phy) = {
+	.name		= "mt7620_usb_phy",
+	.id		= UCLASS_PHY,
+	.of_match	= mt7620_usb_phy_ids,
+	.ops		= &mt7620_usb_phy_ops,
+	.probe		= mt7620_usb_phy_probe,
+	.priv_auto	= sizeof(struct mt7620_usb_phy),
+};