[PATCH] phy-rockchip-pcie: Mark phy_rd_cfg() as __maybe_unused

[mka@xxxxxxxxxxxx (Matthias Kaehlcke)]

The function is not used, but is probably kept around for debugging and
symmetry with phy_wr_cfg(). Adding the attribute fixes the following
warning when building with clang:

drivers/phy/phy-rockchip-pcie.c:102:19: error: unused function
    'phy_rd_cfg' [-Werror,-Wunused-function]

Signed-off-by: Matthias Kaehlcke <mka at chromium.org>
---
 drivers/phy/phy-rockchip-pcie.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/phy-rockchip-pcie.c b/drivers/phy/phy-rockchip-pcie.c
index 6904633cad68..f8c6846094c0 100644
--- a/drivers/phy/phy-rockchip-pcie.c
+++ b/drivers/phy/phy-rockchip-pcie.c
@@ -99,8 +99,8 @@ static inline void phy_wr_cfg(struct rockchip_pcie_phy *rk_phy,
 				   PHY_CFG_WR_SHIFT));
 }
 
-static inline u32 phy_rd_cfg(struct rockchip_pcie_phy *rk_phy,
-			     u32 addr)
+static inline u32 __maybe_unused
+phy_rd_cfg(struct rockchip_pcie_phy *rk_phy, u32 addr)
 {
 	u32 val;
 
-- 
2.13.0.303.g4ebf302169-goog