phy: freescale: imx8mq-usb: add support for imx8mp usb phy

Add initial support for imx8mp usb phy support, imx8mp usb has
a silimar phy as imx8mq, which has some different customizations
on clock and low power design when SoC integration.

Signed-off-by: Li Jun <jun.li@nxp.com>
Link: https://lore.kernel.org/r/1598276014-2377-2-git-send-email-jun.li@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/freescale/phy-fsl-imx8mq-usb.c

@@ -1,15 +1,20 @@
 // SPDX-License-Identifier: GPL-2.0+
 /* Copyright (c) 2017 NXP. */
 
+#include <linux/bitfield.h>
 #include <linux/clk.h>
+#include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/of_platform.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 
 #define PHY_CTRL0			0x0
 #define PHY_CTRL0_REF_SSP_EN		BIT(2)
+#define PHY_CTRL0_FSEL_MASK		GENMASK(10, 5)
+#define PHY_CTRL0_FSEL_24M		0x2a
 
 #define PHY_CTRL1			0x4
 #define PHY_CTRL1_RESET			BIT(0)
@@ -20,6 +25,11 @@
 
 #define PHY_CTRL2			0x8
 #define PHY_CTRL2_TXENABLEN0		BIT(8)
+#define PHY_CTRL2_OTG_DISABLE		BIT(9)
+
+#define PHY_CTRL6			0x18
+#define PHY_CTRL6_ALT_CLK_EN		BIT(1)
+#define PHY_CTRL6_ALT_CLK_SEL		BIT(0)
 
 struct imx8mq_usb_phy {
 	struct phy *phy;
@@ -54,6 +64,44 @@ static int imx8mq_usb_phy_init(struct phy *phy)
 	return 0;
 }
 
+static int imx8mp_usb_phy_init(struct phy *phy)
+{
+	struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
+	u32 value;
+
+	/* USB3.0 PHY signal fsel for 24M ref */
+	value = readl(imx_phy->base + PHY_CTRL0);
+	value &= ~PHY_CTRL0_FSEL_MASK;
+	value |= FIELD_PREP(PHY_CTRL0_FSEL_MASK, PHY_CTRL0_FSEL_24M);
+	writel(value, imx_phy->base + PHY_CTRL0);
+
+	/* Disable alt_clk_en and use internal MPLL clocks */
+	value = readl(imx_phy->base + PHY_CTRL6);
+	value &= ~(PHY_CTRL6_ALT_CLK_SEL | PHY_CTRL6_ALT_CLK_EN);
+	writel(value, imx_phy->base + PHY_CTRL6);
+
+	value = readl(imx_phy->base + PHY_CTRL1);
+	value &= ~(PHY_CTRL1_VDATSRCENB0 | PHY_CTRL1_VDATDETENB0);
+	value |= PHY_CTRL1_RESET | PHY_CTRL1_ATERESET;
+	writel(value, imx_phy->base + PHY_CTRL1);
+
+	value = readl(imx_phy->base + PHY_CTRL0);
+	value |= PHY_CTRL0_REF_SSP_EN;
+	writel(value, imx_phy->base + PHY_CTRL0);
+
+	value = readl(imx_phy->base + PHY_CTRL2);
+	value |= PHY_CTRL2_TXENABLEN0 | PHY_CTRL2_OTG_DISABLE;
+	writel(value, imx_phy->base + PHY_CTRL2);
+
+	udelay(10);
+
+	value = readl(imx_phy->base + PHY_CTRL1);
+	value &= ~(PHY_CTRL1_RESET | PHY_CTRL1_ATERESET);
+	writel(value, imx_phy->base + PHY_CTRL1);
+
+	return 0;
+}
+
 static int imx8mq_phy_power_on(struct phy *phy)
 {
 	struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
@@ -83,12 +131,29 @@ static struct phy_ops imx8mq_usb_phy_ops = {
 	.owner		= THIS_MODULE,
 };
 
+static struct phy_ops imx8mp_usb_phy_ops = {
+	.init		= imx8mp_usb_phy_init,
+	.power_on	= imx8mq_phy_power_on,
+	.power_off	= imx8mq_phy_power_off,
+	.owner		= THIS_MODULE,
+};
+
+static const struct of_device_id imx8mq_usb_phy_of_match[] = {
+	{.compatible = "fsl,imx8mq-usb-phy",
+	 .data = &imx8mq_usb_phy_ops,},
+	{.compatible = "fsl,imx8mp-usb-phy",
+	 .data = &imx8mp_usb_phy_ops,},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, imx8mq_usb_phy_of_match);
+
 static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 {
 	struct phy_provider *phy_provider;
 	struct device *dev = &pdev->dev;
 	struct imx8mq_usb_phy *imx_phy;
 	struct resource *res;
+	const struct phy_ops *phy_ops;
 
 	imx_phy = devm_kzalloc(dev, sizeof(*imx_phy), GFP_KERNEL);
 	if (!imx_phy)
@@ -105,7 +170,11 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 	if (IS_ERR(imx_phy->base))
 		return PTR_ERR(imx_phy->base);
 
-	imx_phy->phy = devm_phy_create(dev, NULL, &imx8mq_usb_phy_ops);
+	phy_ops = of_device_get_match_data(dev);
+	if (!phy_ops)
+		return -EINVAL;
+
+	imx_phy->phy = devm_phy_create(dev, NULL, phy_ops);
 	if (IS_ERR(imx_phy->phy))
 		return PTR_ERR(imx_phy->phy);
 
@@ -120,12 +189,6 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 	return PTR_ERR_OR_ZERO(phy_provider);
 }
 
-static const struct of_device_id imx8mq_usb_phy_of_match[] = {
-	{.compatible = "fsl,imx8mq-usb-phy",},
-	{ },
-};
-MODULE_DEVICE_TABLE(of, imx8mq_usb_phy_of_match);
-
 static struct platform_driver imx8mq_usb_phy_driver = {
 	.probe	= imx8mq_usb_phy_probe,
 	.driver = {