net: phy: Handle not having GPIO enabled in the kernel

If CONFIG_GPIOLIB is disabled, fwnode_get_named_gpiod() becomes a stub
function, which return -ENOSYS. Handle this in the same way as
-ENOENT, i.e. assume there is no GPIO used to reset the PHYs.

Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Fixes: bafbdd527d56 ("phylib: Add device reset GPIO support")
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 88272b3ac2e23518318b03c49dd7f973c8009b11..24b5511222c8fd5d92f93e86c68292decb57e17e 100644 (file)
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -56,7 +56,8 @@ static int mdiobus_register_gpiod(struct mdio_device *mdiodev)
                gpiod = fwnode_get_named_gpiod(&mdiodev->dev.of_node->fwnode,
                                               "reset-gpios", 0, GPIOD_OUT_LOW,
                                               "PHY reset");
-       if (PTR_ERR(gpiod) == -ENOENT)
+       if (PTR_ERR(gpiod) == -ENOENT ||
+           PTR_ERR(gpiod) == -ENOSYS)
                gpiod = NULL;
        else if (IS_ERR(gpiod))
                return PTR_ERR(gpiod);