Add documentation on phy function usage: init function must be
called before power_on; power_off must be called before exit.
Signed-off-by: Jules Maselbas <jmaselbas@xxxxxxxxx>
Cc: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
Cc: Amelie DELAUNAY <amelie.delaunay@xxxxxxxxxxx>
Cc: Minas Harutyunyan <hminas@xxxxxxxxxxxx>
Cc: Kishon Vijay Abraham I <kishon@xxxxxx>
---
change in v2:
- Update the documentation syntax for returned value
drivers/phy/phy-core.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
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 @@ int phy_init(struct phy *phy)
}
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 @@ int phy_exit(struct phy *phy)
}
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 @@ int phy_power_on(struct phy *phy)
}
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;
--
2.17.1
