net: macb: In ZynqMP initialization make SGMII phy configuration optional

In the macb binding documentation "phys" is an optional property. Make
implementation in line with it. This change allows the traditional flow
in which first stage bootloader does PS-GT configuration to work along
with newer use cases in which PS-GT configuration is managed by the
phy-zynqmp driver.

It fixes below macb probe failure when macb DT node doesn't have SGMII
phys handle.
"macb ff0b0000.ethernet: error -ENODEV: failed to get PS-GTR PHY"

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Reviewed-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index a5140d4d3baf6312f66a3685143deada799d30e8..6434e74c04f1949ff40dc584c2c47459e69d2d4d 100644 (file)
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -4588,7 +4588,7 @@ static int zynqmp_init(struct platform_device *pdev)
 
        if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) {
                /* Ensure PS-GTR PHY device used in SGMII mode is ready */
-               bp->sgmii_phy = devm_phy_get(&pdev->dev, "sgmii-phy");
+               bp->sgmii_phy = devm_phy_optional_get(&pdev->dev, NULL);
 
                if (IS_ERR(bp->sgmii_phy)) {
                        ret = PTR_ERR(bp->sgmii_phy);