[PATCH 1/2] phy: freescale: imx8mq-usb: add support for i.MX8MP PHY

[Lucas Stach]

This is a port of the Linux kernel commit 4708ee37826e
by Li Jun <jun.li at nxp.com>. The USB3 PHY in the i.MX8MP is very
close to the one in the i.MX8MQ and just needs a different setup
routine.

Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
---
 drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 87 ++++++++++++++++++----
 1 file changed, 74 insertions(+), 13 deletions(-)

diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
index d3f9c1ba6ecf..fc5fb006b56c 100644
--- a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
+++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
@@ -2,20 +2,24 @@
 /* Copyright (c) 2017 NXP. */
 
 #include <common.h>
+#include <driver.h>
+#include <errno.h>
 #include <init.h>
 #include <io.h>
-#include <of.h>
-#include <errno.h>
-#include <driver.h>
-#include <malloc.h>
-#include <usb/phy.h>
-#include <linux/phy/phy.h>
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/err.h>
+#include <linux/phy/phy.h>
+#include <malloc.h>
+#include <of_device.h>
+#include <of.h>
+#include <usb/phy.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)
@@ -26,6 +30,11 @@
 
 #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;
@@ -59,6 +68,44 @@ 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);
@@ -75,12 +122,26 @@ static int imx8mq_phy_power_off(struct phy *phy)
 	return 0;
 }
 
-static struct phy_ops imx8mq_usb_phy_ops = {
+static const struct phy_ops imx8mq_usb_phy_ops = {
 	.init		= imx8mq_usb_phy_init,
 	.power_on	= imx8mq_phy_power_on,
 	.power_off	= imx8mq_phy_power_off,
 };
 
+static const struct phy_ops imx8mp_usb_phy_ops = {
+	.init		= imx8mp_usb_phy_init,
+	.power_on	= imx8mq_phy_power_on,
+	.power_off	= imx8mq_phy_power_off,
+};
+
+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,},
+	{ }
+};
+
 static struct phy *imx8mq_usb_phy_xlate(struct device_d *dev,
 					struct of_phandle_args *args)
 {
@@ -93,6 +154,7 @@ static int imx8mq_usb_phy_probe(struct device_d *dev)
 {
 	struct phy_provider *phy_provider;
 	struct imx8mq_usb_phy *imx_phy;
+	const struct phy_ops *phy_ops;
 
 	imx_phy = xzalloc(sizeof(*imx_phy));
 
@@ -106,7 +168,11 @@ static int imx8mq_usb_phy_probe(struct device_d *dev)
 	if (IS_ERR(imx_phy->base))
 		return PTR_ERR(imx_phy->base);
 
-	imx_phy->phy = phy_create(dev, NULL, &imx8mq_usb_phy_ops);
+	phy_ops = of_device_get_match_data(dev);
+	if (!phy_ops)
+		return -EINVAL;
+
+	imx_phy->phy = phy_create(dev, NULL, phy_ops);
 	if (IS_ERR(imx_phy->phy))
 		return PTR_ERR(imx_phy->phy);
 
@@ -117,11 +183,6 @@ static int imx8mq_usb_phy_probe(struct device_d *dev)
 	return PTR_ERR_OR_ZERO(phy_provider);
 }
 
-static const struct of_device_id imx8mq_usb_phy_of_match[] = {
-	{.compatible = "fsl,imx8mq-usb-phy",},
-	{ },
-};
-
 static struct driver_d imx8mq_usb_phy_driver = {
 	.name	= "imx8mq-usb-phy",
 	.probe	= imx8mq_usb_phy_probe,
-- 
2.34.1