phy: core: rework phy_set_mode to accept phy mode and submode

Currently the attempt to add support for Ethernet interface mode PHY
(MII/GMII/RGMII) will lead to the necessity of extending enum phy_mode and
duplicate there values from phy_interface_t enum (or introduce more PHY
callbacks) [1]. Both approaches are ineffective and would lead to fast
bloating of enum phy_mode or struct phy_ops in the process of adding more
PHYs for different subsystems which will make them unmaintainable.

As discussed in [1] the solution could be to introduce dual level PHYs mode
configuration - PHY mode and PHY submode. The PHY mode will define generic
PHY type (subsystem - PCIE/ETHERNET/USB_) while the PHY submode - subsystem
specific interface mode. The last is usually already defined in
corresponding subsystem headers (phy_interface_t for Ethernet, enum
usb_device_speed for USB).

This patch is cumulative change which refactors PHY framework code to
support dual level PHYs mode configuration - PHY mode and PHY submode. It
extends .set_mode() callback to support additional parameter "int submode"
and converts all corresponding PHY drivers to support new .set_mode()
callback declaration.
The new extended PHY API
 int phy_set_mode_ext(struct phy *phy, enum phy_mode mode, int submode)
is introduced to support dual level PHYs mode configuration and existing
phy_set_mode() API is converted to macros, so PHY framework consumers do
not need to be changed (~21 matches).

[1] http://lkml.kernel.org/r/d63588f6-9ab0-848a-5ad4-8073143bd95d@ti.com
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index 03b319f89a34..b17e7709c5dc 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -60,7 +60,7 @@ struct phy_ops {
 	int	(*exit)(struct phy *phy);
 	int	(*power_on)(struct phy *phy);
 	int	(*power_off)(struct phy *phy);
-	int	(*set_mode)(struct phy *phy, enum phy_mode mode);
+	int	(*set_mode)(struct phy *phy, enum phy_mode mode, int submode);
 	int	(*reset)(struct phy *phy);
 	int	(*calibrate)(struct phy *phy);
 	struct module *owner;
@@ -164,7 +164,10 @@ int phy_init(struct phy *phy);
 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_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)
+
 static inline enum phy_mode phy_get_mode(struct phy *phy)
 {
 	return phy->attrs.mode;
@@ -278,13 +281,17 @@ static inline int phy_power_off(struct phy *phy)
 	return -ENOSYS;
 }
 
-static inline int phy_set_mode(struct phy *phy, enum phy_mode mode)
+static inline int phy_set_mode_ext(struct phy *phy, enum phy_mode mode,
+				   int submode)
 {
 	if (!phy)
 		return 0;
 	return -ENOSYS;
 }
 
+#define phy_set_mode(phy, mode) \
+	phy_set_mode_ext(phy, mode, 0)
+
 static inline enum phy_mode phy_get_mode(struct phy *phy)
 {
 	return PHY_MODE_INVALID;