usb: phy: generic: Don't use regulator framework for RESET line

Modelling the RESET line as a regulator supply wasn't a good idea
as it kind of abuses the regulator framework and also makes adaptation
code more complex.

Instead, manage the RESET gpio line directly in the driver. Update
the device tree binding information.

This also makes us easy to migrate to a dedicated GPIO RESET controller
whenever it becomes available.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

3 files changed, 60 insertions, 32 deletions

diff --git a/drivers/usb/phy/phy-am335x.c b/drivers/usb/phy/phy-am335x.c
index 1495cdc751ad..6370e50649d7 100644
--- a/drivers/usb/phy/phy-am335x.c
+++ b/drivers/usb/phy/phy-am335x.c
@@ -53,7 +53,7 @@ static int am335x_phy_probe(struct platform_device *pdev)
         }
 
         ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen,
-                        USB_PHY_TYPE_USB2, 0, false, false);
+                        USB_PHY_TYPE_USB2, 0, false);
         if (ret)
                 return ret;
 
diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c
index fcc31045fda7..fce3a9e9bb5d 100644
--- a/drivers/usb/phy/phy-generic.c
+++ b/drivers/usb/phy/phy-generic.c
@@ -35,6 +35,9 @@
 #include <linux/clk.h>
 #include <linux/regulator/consumer.h>
 #include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
 
 #include "phy-generic.h"
 
@@ -64,6 +67,23 @@ static int nop_set_suspend(struct usb_phy *x, int suspend)
         return 0;
 }
 
+static void nop_reset_set(struct usb_phy_gen_xceiv *nop, int asserted)
+{
+        int value;
+
+        if (!gpio_is_valid(nop->gpio_reset))
+                return;
+
+        value = asserted;
+        if (nop->reset_active_low)
+                value = !value;
+
+        gpio_set_value_cansleep(nop->gpio_reset, value);
+
+        if (!asserted)
+                usleep_range(10000, 20000);
+}
+
 int usb_gen_phy_init(struct usb_phy *phy)
 {
         struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);
@@ -76,11 +96,8 @@ int usb_gen_phy_init(struct usb_phy *phy)
         if (!IS_ERR(nop->clk))
                 clk_prepare_enable(nop->clk);
 
-        if (!IS_ERR(nop->reset)) {
-                /* De-assert RESET */
-                if (regulator_enable(nop->reset))
-                        dev_err(phy->dev, "Failed to de-assert reset\n");
-        }
+        /* De-assert RESET */
+        nop_reset_set(nop, 0);
 
         return 0;
 }
@@ -90,11 +107,8 @@ void usb_gen_phy_shutdown(struct usb_phy *phy)
 {
         struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);
 
-        if (!IS_ERR(nop->reset)) {
-                /* Assert RESET */
-                if (regulator_disable(nop->reset))
-                        dev_err(phy->dev, "Failed to assert reset\n");
-        }
+        /* Assert RESET */
+        nop_reset_set(nop, 1);
 
         if (!IS_ERR(nop->clk))
                 clk_disable_unprepare(nop->clk);
@@ -136,8 +150,7 @@ static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
 }
 
 int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_gen_xceiv *nop,
-                enum usb_phy_type type, u32 clk_rate, bool needs_vcc,
-                bool needs_reset)
+                enum usb_phy_type type, u32 clk_rate, bool needs_vcc)
 {
         int err;
 
@@ -168,12 +181,22 @@ int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_gen_xceiv *nop,
                         return -EPROBE_DEFER;
         }
 
-        nop->reset = devm_regulator_get(dev, "reset");
-        if (IS_ERR(nop->reset)) {
-                dev_dbg(dev, "Error getting reset regulator: %ld\n",
-                                        PTR_ERR(nop->reset));
-                if (needs_reset)
-                        return -EPROBE_DEFER;
+        if (gpio_is_valid(nop->gpio_reset)) {
+                unsigned long gpio_flags;
+
+                /* Assert RESET */
+                if (nop->reset_active_low)
+                        gpio_flags = GPIOF_OUT_INIT_LOW;
+                else
+                        gpio_flags = GPIOF_OUT_INIT_HIGH;
+
+                err = devm_gpio_request_one(dev, nop->gpio_reset,
+                                                gpio_flags, dev_name(dev));
+                if (err) {
+                        dev_err(dev, "Error requesting RESET GPIO %d\n",
+                                        nop->gpio_reset);
+                        return err;
+                }
         }
 
         nop->dev                = dev;
@@ -202,31 +225,36 @@ static int usb_phy_gen_xceiv_probe(struct platform_device *pdev)
         int err;
         u32 clk_rate = 0;
         bool needs_vcc = false;
-        bool needs_reset = false;
+
+        nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
+        if (!nop)
+                return -ENOMEM;
+
+        nop->reset_active_low = true;   /* default behaviour */
 
         if (dev->of_node) {
                 struct device_node *node = dev->of_node;
+                enum of_gpio_flags flags;
 
                 if (of_property_read_u32(node, "clock-frequency", &clk_rate))
                         clk_rate = 0;
 
                 needs_vcc = of_property_read_bool(node, "vcc-supply");
-                needs_reset = of_property_read_bool(node, "reset-supply");
+                nop->gpio_reset = of_get_named_gpio_flags(node, "reset-gpios",
+                                                                0, &flags);
+                if (nop->gpio_reset == -EPROBE_DEFER)
+                        return -EPROBE_DEFER;
+
+                nop->reset_active_low = flags & OF_GPIO_ACTIVE_LOW;
 
         } else if (pdata) {
                 type = pdata->type;
                 clk_rate = pdata->clk_rate;
                 needs_vcc = pdata->needs_vcc;
-                needs_reset = pdata->needs_reset;
+                nop->gpio_reset = pdata->gpio_reset;
         }
 
-        nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
-        if (!nop)
-                return -ENOMEM;
-
-
-        err = usb_phy_gen_create_phy(dev, nop, type, clk_rate, needs_vcc,
-                        needs_reset);
+        err = usb_phy_gen_create_phy(dev, nop, type, clk_rate, needs_vcc);
         if (err)
                 return err;
 
diff --git a/drivers/usb/phy/phy-generic.h b/drivers/usb/phy/phy-generic.h
index 386d11b375aa..d2a220d81734 100644
--- a/drivers/usb/phy/phy-generic.h
+++ b/drivers/usb/phy/phy-generic.h
@@ -6,14 +6,14 @@ struct usb_phy_gen_xceiv {
         struct device *dev;
         struct clk *clk;
         struct regulator *vcc;
-        struct regulator *reset;
+        int gpio_reset;
+        bool reset_active_low;
 };
 
 int usb_gen_phy_init(struct usb_phy *phy);
 void usb_gen_phy_shutdown(struct usb_phy *phy);
 
 int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_gen_xceiv *nop,
-                enum usb_phy_type type, u32 clk_rate, bool needs_vcc,
-                bool needs_reset);
+                enum usb_phy_type type, u32 clk_rate, bool needs_vcc);
 
 #endif