[PATCH][next] phy: core: make NULL a valid phy reference if !CONFIG_GENERIC_PHY

[Grygorii Strashko]

This fixes a regression on Keystone 2 platforms caused by patch
57303488cd37da58263e842de134dc65f7c626d5
"usb: dwc3: adapt dwc3 core to use Generic PHY Framework" which adds
optional support of generic phy in DWC3 core.

On Keystone 2 platforms the USB is not working now because
CONFIG_GENERIC_PHY isn't set and, as result, Generic PHY APIs stubs
return -ENOSYS always. The log shows:
 dwc3 2690000.dwc3: failed to initialize core
 dwc3: probe of 2690000.dwc3 failed with error -38

Hence, fix it by making NULL a valid phy reference in Generic PHY
APIs stubs in the same way as it was done by the patch
04c2facad8fee66c981a51852806d8923336f362 "drivers: phy: Make NULL
a valid phy reference".

CC: Kishon Vijay Abraham I <kis...@ti.com>
CC: Felipe Balbi <ba...@ti.com>
CC: Santosh Shilimkar <santosh.shilim...@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.stras...@ti.com>
---
 include/linux/phy/phy.h |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index e2f5ca9..5a9b193 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -204,21 +204,29 @@ static inline void phy_pm_runtime_forbid(struct phy *phy)
 
 static inline int phy_init(struct phy *phy)
 {
+       if (!phy)
+               return 0;
        return -ENOSYS;
 }
 
 static inline int phy_exit(struct phy *phy)
 {
+       if (!phy)
+               return 0;
        return -ENOSYS;
 }
 
 static inline int phy_power_on(struct phy *phy)
 {
+       if (!phy)
+               return 0;
        return -ENOSYS;
 }
 
 static inline int phy_power_off(struct phy *phy)
 {
+       if (!phy)
+               return 0;
        return -ENOSYS;
 }
 
-- 
1.7.9.5

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