[PATCH 5.4 144/165] net: stmmac: Fixed link does not need MDIO Bus

[Greg Kroah-Hartman]

From: Jose Abreu <Jose.Abreu@xxxxxxxxxxxx>

[ Upstream commit da29f2d84bd10234df570b7f07cbd0166e738230 ]

When using fixed link we don't need the MDIO bus support.

Reported-by: Heiko Stuebner <heiko@xxxxxxxxx>
Reported-by: kernelci.org bot <bot@xxxxxxxxxxxx>
Fixes: d3e014ec7d5e ("net: stmmac: platform: Fix MDIO init for platforms without PHY")
Signed-off-by: Jose Abreu <Jose.Abreu@xxxxxxxxxxxx>
Acked-by: Sriram Dash <Sriram.dash@xxxxxxxxxxx>
Tested-by: Patrice Chotard <patrice.chotard@xxxxxx>
Tested-by: Heiko Stuebner <heiko@xxxxxxxxx>
Acked-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Tested-by: Florian Fainelli <f.fainelli@gmail> # Lamobo R1 (fixed-link + MDIO sub node for roboswitch).
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -320,7 +320,7 @@ out:
 static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
 			 struct device_node *np, struct device *dev)
 {
-	bool mdio = false;
+	bool mdio = !of_phy_is_fixed_link(np);
 	static const struct of_device_id need_mdio_ids[] = {
 		{ .compatible = "snps,dwc-qos-ethernet-4.10" },
 		{},