arm: dts: Add mac node for rk3308 at dtsi level

The rk3308 only support RMII mode, and if it is output clock
mode, better to use ref_clk pin with drive strength 12ma.
Signed-off-by: NDavid Wu <david.wu@rock-chips.com>
Reviewed-by: NKever Yang <kever.yang@rock-chips.com>

arch/arm/dts/rk3308.dtsi

@@ -627,6 +627,28 @@
 		status = "disabled";
 	};
 
+	mac: ethernet@ff4e0000 {
+		compatible = "rockchip,rk3308-mac";
+		reg = <0x0 0xff4e0000 0x0 0x10000>;
+		rockchip,grf = <&grf>;
+		interrupts = <GIC_SPI 64 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "macirq";
+		clocks = <&cru SCLK_MAC>, <&cru SCLK_MAC_RX_TX>,
+			 <&cru SCLK_MAC_RX_TX>, <&cru SCLK_MAC_REF>,
+			 <&cru SCLK_MAC>, <&cru ACLK_MAC>,
+			 <&cru PCLK_MAC>, <&cru SCLK_MAC_RMII>;
+		clock-names = "stmmaceth", "mac_clk_rx",
+			      "mac_clk_tx", "clk_mac_ref",
+			      "clk_mac_refout", "aclk_mac",
+			      "pclk_mac", "clk_mac_speed";
+		phy-mode = "rmii";
+		pinctrl-names = "default";
+		pinctrl-0 = <&rmii_pins &mac_refclk_12ma>;
+		resets = <&cru SRST_MAC_A>;
+		reset-names = "stmmaceth";
+		status = "disabled";
+	};
+
 	cru: clock-controller@ff500000 {
 		compatible = "rockchip,rk3308-cru";
 		reg = <0x0 0xff500000 0x0 0x1000>;