phy: core: Support regulator supply for PHY power

Some PHYs can be powered by an external power regulator.
e.g. USB_HS PHY on DRA7 SoC. Make the PHY core support a
power regulator.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 49c4465..75c9739 100644 (file)
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -21,6 +21,7 @@
 #include <linux/phy/phy.h>
 #include <linux/idr.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 
 static struct class *phy_class;
 static DEFINE_MUTEX(phy_provider_mutex);
@@ -226,6 +227,12 @@ int phy_power_on(struct phy *phy)
        if (!phy)
                return 0;
 
+       if (phy->pwr) {
+               ret = regulator_enable(phy->pwr);
+               if (ret)
+                       return ret;
+       }
+
        ret = phy_pm_runtime_get_sync(phy);
        if (ret < 0 && ret != -ENOTSUPP)
                return ret;
@@ -247,6 +254,8 @@ int phy_power_on(struct phy *phy)
 out:
        mutex_unlock(&phy->mutex);
        phy_pm_runtime_put_sync(phy);
+       if (phy->pwr)
+               regulator_disable(phy->pwr);
 
        return ret;
 }
@@ -272,6 +281,9 @@ int phy_power_off(struct phy *phy)
        mutex_unlock(&phy->mutex);
        phy_pm_runtime_put(phy);
 
+       if (phy->pwr)
+               regulator_disable(phy->pwr);
+
        return 0;
 }
 EXPORT_SYMBOL_GPL(phy_power_off);
@@ -588,6 +600,16 @@ struct phy *phy_create(struct device *dev, const struct phy_ops *ops,
                goto free_phy;
        }
 
+       /* phy-supply */
+       phy->pwr = regulator_get_optional(dev, "phy");
+       if (IS_ERR(phy->pwr)) {
+               if (PTR_ERR(phy->pwr) == -EPROBE_DEFER) {
+                       ret = -EPROBE_DEFER;
+                       goto free_ida;
+               }
+               phy->pwr = NULL;
+       }
+
        device_initialize(&phy->dev);
        mutex_init(&phy->mutex);
 
@@ -617,6 +639,9 @@ put_dev:
        put_device(&phy->dev);  /* calls phy_release() which frees resources */
        return ERR_PTR(ret);
 
+free_ida:
+       ida_simple_remove(&phy_ida, phy->id);
+
 free_phy:
        kfree(phy);
        return ERR_PTR(ret);
@@ -800,6 +825,7 @@ static void phy_release(struct device *dev)
 
        phy = to_phy(dev);
        dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
+       regulator_put(phy->pwr);
        ida_simple_remove(&phy_ida, phy->id);
        kfree(phy);
 }

diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index 2760744..9a86945 100644 (file)
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -18,6 +18,7 @@
 #include <linux/of.h>
 #include <linux/device.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 
 struct phy;
 
@@ -65,6 +66,7 @@ struct phy {
        int                     init_count;
        int                     power_count;
        struct phy_attrs        attrs;
+       struct regulator        *pwr;
 };
 
 /**