1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 91e28d6ce450..2f32f999445f 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -229,6 +229,17 @@ void phy_pm_runtime_forbid(struct phy *phy)
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid);
 
+/**
+ * phy_init - phy internal initialization before phy operation
+ * @phy: the phy returned by phy_get()
+ *
+ * Used to allow phy's driver to perform phy internal initialization,
+ * such as PLL block powering, clock initialization or anything that's
+ * is required by the phy to perform the start of operation.
+ * Must be called before phy_power_on().
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
 int phy_init(struct phy *phy)
 {
 	int ret;
@@ -258,6 +269,14 @@ out:
 }
 EXPORT_SYMBOL_GPL(phy_init);
 
+/**
+ * phy_exit - Phy internal un-initialization
+ * @phy: the phy returned by phy_get()
+ *
+ * Must be called after phy_power_off().
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
 int phy_exit(struct phy *phy)
 {
 	int ret;
@@ -287,6 +306,14 @@ out:
 }
 EXPORT_SYMBOL_GPL(phy_exit);
 
+/**
+ * phy_power_on - Enable the phy and enter proper operation
+ * @phy: the phy returned by phy_get()
+ *
+ * Must be called after phy_init().
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
 int phy_power_on(struct phy *phy)
 {
 	int ret = 0;
@@ -329,6 +356,14 @@ out:
 }
 EXPORT_SYMBOL_GPL(phy_power_on);
 
+/**
+ * phy_power_off - Disable the phy.
+ * @phy: the phy returned by phy_get()
+ *
+ * Must be called before phy_exit().
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
 int phy_power_off(struct phy *phy)
 {
 	int ret;