[PATCH 3/4] phy: add phy_configure operation

[Ahmad Fatoum <a.fatoum@barebox.org>]

This callback will be needed for upcoming Rockchip MIPI-DSI PHY support.

Signed-off-by: Ahmad Fatoum <a.fatoum@barebox.org>
---
 drivers/phy/phy-core.c  | 23 +++++++++++++++++++++++
 include/linux/phy/phy.h | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index d4c704809cfa..fa404884c924 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -282,6 +282,29 @@ int phy_set_mode_ext(struct phy *phy, enum phy_mode mode, int submode)
 }
 EXPORT_SYMBOL_GPL(phy_set_mode_ext);
 
+/**
+ * phy_configure() - Changes the phy parameters
+ * @phy: the phy returned by phy_get()
+ * @opts: New configuration to apply
+ *
+ * Used to change the PHY parameters. phy_init() must have been called
+ * on the phy. The configuration will be applied on the current phy
+ * mode, that can be changed using phy_set_mode().
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
+int phy_configure(struct phy *phy, union phy_configure_opts *opts)
+{
+	if (!phy)
+		return -EINVAL;
+
+	if (!phy->ops->configure)
+		return -EOPNOTSUPP;
+
+	return phy->ops->configure(phy, opts);
+}
+EXPORT_SYMBOL_GPL(phy_configure);
+
 struct usb_phy *phy_to_usbphy(struct phy *phy)
 {
 	if (!phy)
diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index b4a99c9c7037..89e62dee9139 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -44,6 +44,16 @@ enum phy_mode {
 	PHY_MODE_DP
 };
 
+/**
+ * union phy_configure_opts - Opaque generic phy configuration
+ *
+ * @mipi_dphy:	Configuration set applicable for phys supporting
+ *		the MIPI_DPHY phy mode.
+ */
+union phy_configure_opts {
+	struct phy_configure_opts_mipi_dphy	mipi_dphy;
+};
+
 /**
  * struct phy_ops - set of function pointers for performing phy operations
  * @init: operation to be performed for initializing phy
@@ -60,6 +70,18 @@ struct phy_ops {
 	int	(*power_off)(struct phy *phy);
 	int	(*set_mode)(struct phy *phy, enum phy_mode mode, int submode);
 	struct usb_phy *(*to_usbphy)(struct phy *phy);
+
+	/**
+	 * @configure:
+	 *
+	 * Optional.
+	 *
+	 * Used to change the PHY parameters. phy_init() must have
+	 * been called on the phy.
+	 *
+	 * Returns: 0 if successful, an negative error code otherwise
+	 */
+	int	(*configure)(struct phy *phy, union phy_configure_opts *opts);
 };
 
 /**
@@ -159,6 +181,7 @@ int phy_power_off(struct phy *phy);
 int phy_set_mode_ext(struct phy *phy, enum phy_mode mode, int submode);
 #define phy_set_mode(phy, mode) \
         phy_set_mode_ext(phy, mode, 0)
+int phy_configure(struct phy *phy, union phy_configure_opts *opts);
 static inline int phy_get_bus_width(struct phy *phy)
 {
 	return phy->attrs.bus_width;
@@ -222,6 +245,15 @@ static inline int phy_set_mode_ext(struct phy *phy, enum phy_mode mode,
 #define phy_set_mode(phy, mode) \
         phy_set_mode_ext(phy, mode, 0)
 
+static inline int phy_configure(struct phy *phy,
+				union phy_configure_opts *opts)
+{
+	if (!phy)
+		return 0;
+
+	return -ENOSYS;
+}
+
 static inline int phy_get_bus_width(struct phy *phy)
 {
 	return -ENOSYS;
-- 
2.47.3