[PATCH 4.5 155/238] ARC: [plat-axs10x] add Ethernet PHY description in .dts

4.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexey Brodkin <redacted>

commit 667a490bdb6e27db0887d2ca515b907d6aa87118 upstream.

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 <redacted>
Cc: David S. Miller <davem@davemloft.net>
Cc: linux-kernel@vger.kernel.org
Cc: netdev@vger.kernel.org
Reviewed-by: Sergei Shtylyov <redacted>
Signed-off-by: Vineet Gupta <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arc/boot/dts/axs10x_mb.dtsi |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/arch/arc/boot/dts/axs10x_mb.dtsi
+++ b/arch/arc/boot/dts/axs10x_mb.dtsi

@@ -47,6 +47,14 @@
 			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 {