ARC: [plat-axs10x] add Ethernet PHY description in .dts

Commit e34d65696d2e ("stmmac: create of compatible mdio bus for stmmac
driver") broke DW GMAC functionality on ARC AXS10x boards:

That's what happens on eth0 up:
  --------------------------->8------------------------
| libphy: PHY stmmac-0:ffffffff not found
| eth0: Could not attach to PHY
| stmmac_open: Cannot attach to PHY (error: -19)
  --------------------------->8------------------------

Simplest solution is to add PHY description in board's .dts.
And so we do here.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Phil Reid <preid@electromag.com.au>
Cc: David S. Miller <davem@davemloft.net>
Cc: linux-kernel@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: stable@vger.kernel.org # 4.5
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --git a/arch/arc/boot/dts/axs10x_mb.dtsi b/arch/arc/boot/dts/axs10x_mb.dtsi
index 44a578c10732cd1ab79558415e3c66f6825c98bd..ab5d5701e11d448200d3010df229c9f5f57875d9 100644 (file)
--- a/arch/arc/boot/dts/axs10x_mb.dtsi
+++ b/arch/arc/boot/dts/axs10x_mb.dtsi
@@ -47,6 +47,14 @@ ethernet@0x18000 {
                        clocks = <&apbclk>;
                        clock-names = "stmmaceth";
                        max-speed = <100>;
+                       mdio0 {
+                               #address-cells = <1>;
+                               #size-cells = <0>;
+                               compatible = "snps,dwmac-mdio";
+                               phy1: ethernet-phy@1 {
+                                       reg = <1>;
+                               };
+                       };
                };
 
                ehci@0x40000 {