phy: Add reset callback

The only use for this is for solving a hardware design problem in
usb of Rockchip RK3288.

Signed-off-by: Randy Li <ayaka@soulik.info>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
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 8eca906..a268f4d 100644 (file)
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -357,6 +357,21 @@ int phy_set_mode(struct phy *phy, enum phy_mode mode)
 }
 EXPORT_SYMBOL_GPL(phy_set_mode);
 
+int phy_reset(struct phy *phy)
+{
+       int ret;
+
+       if (!phy || !phy->ops->reset)
+               return 0;
+
+       mutex_lock(&phy->mutex);
+       ret = phy->ops->reset(phy);
+       mutex_unlock(&phy->mutex);
+
+       return ret;
+}
+EXPORT_SYMBOL_GPL(phy_reset);
+
 /**
  * _of_phy_get() - lookup and obtain a reference to a phy by phandle
  * @np: device_node for which to get the phy

diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index f08b672..ee1bed7 100644 (file)
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -36,6 +36,7 @@ enum phy_mode {
  * @power_on: powering on the phy
  * @power_off: powering off the phy
  * @set_mode: set the mode of the phy
+ * @reset: resetting the phy
  * @owner: the module owner containing the ops
  */
 struct phy_ops {
@@ -44,6 +45,7 @@ struct phy_ops {
        int     (*power_on)(struct phy *phy);
        int     (*power_off)(struct phy *phy);
        int     (*set_mode)(struct phy *phy, enum phy_mode mode);
+       int     (*reset)(struct phy *phy);
        struct module *owner;
 };
 
@@ -136,6 +138,7 @@ int phy_exit(struct phy *phy);
 int phy_power_on(struct phy *phy);
 int phy_power_off(struct phy *phy);
 int phy_set_mode(struct phy *phy, enum phy_mode mode);
+int phy_reset(struct phy *phy);
 static inline int phy_get_bus_width(struct phy *phy)
 {
        return phy->attrs.bus_width;