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, 3 insertions, 3 deletions

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 35fd38c5a4a1..df3d4ba516ab 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -360,7 +360,7 @@ int phy_power_off(struct phy *phy)
 }
 EXPORT_SYMBOL_GPL(phy_power_off);
 
-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)
 {
 	int ret;
 
@@ -368,14 +368,14 @@ int phy_set_mode(struct phy *phy, enum phy_mode mode)
 		return 0;
 
 	mutex_lock(&phy->mutex);
-	ret = phy->ops->set_mode(phy, mode);
+	ret = phy->ops->set_mode(phy, mode, submode);
 	if (!ret)
 		phy->attrs.mode = mode;
 	mutex_unlock(&phy->mutex);
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(phy_set_mode);
+EXPORT_SYMBOL_GPL(phy_set_mode_ext);
 
 int phy_reset(struct phy *phy)
 {