[PATCH AUTOSEL 4.4 18/20] net: stmmac: dwmac-rk: Don't fail if phy regulator is absent

[Sasha Levin <sashal@kernel.org>]

From: Chen-Yu Tsai <wens@csie.org>

[ Upstream commit 3b25528e1e355c803e73aa326ce657b5606cda73 ]

The devicetree binding lists the phy phy as optional. As such, the
driver should not bail out if it can't find a regulator. Instead it
should just skip the remaining regulator related code and continue
on normally.

Skip the remainder of phy_power_on() if a regulator supply isn't
available. This also gets rid of the bogus return code.

Fixes: 2e12f536635f ("net: stmmac: dwmac-rk: Use standard devicetree property for phy regulator")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index 398b08e07149b..68a58333bd740 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -429,10 +429,8 @@ static int phy_power_on(struct rk_priv_data *bsp_priv, bool enable)
 	int ret;
 	struct device *dev = &bsp_priv->pdev->dev;
 
-	if (!ldo) {
-		dev_err(dev, "no regulator found\n");
-		return -1;
-	}
+	if (!ldo)
+		return 0;
 
 	if (enable) {
 		ret = regulator_enable(ldo);
-- 
2.20.1