ARM: dts: sun7i: Add GMAC clock node to sun7i DTSI

The GMAC uses 1 of 2 sources for its transmit clock, depending on the
PHY interface mode. Add both sources as dummy clocks, and as parents
to the GMAC clock node.
Signed-off-by: NChen-Yu Tsai <wens@csie.org>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun7i-a20.dtsi

@@ -321,6 +321,34 @@
 			clock-output-names = "mbus";
 		};
 
+		/*
+		 * The following two are dummy clocks, placeholders used in the gmac_tx
+		 * clock. The gmac driver will choose one parent depending on the PHY
+		 * interface mode, using clk_set_rate auto-reparenting.
+		 * The actual TX clock rate is not controlled by the gmac_tx clock.
+		 */
+		mii_phy_tx_clk: clk@2 {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <25000000>;
+			clock-output-names = "mii_phy_tx";
+		};
+
+		gmac_int_tx_clk: clk@3 {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <125000000>;
+			clock-output-names = "gmac_int_tx";
+		};
+
+		gmac_tx_clk: clk@01c20164 {
+			#clock-cells = <0>;
+			compatible = "allwinner,sun7i-a20-gmac-clk";
+			reg = <0x01c20164 0x4>;
+			clocks = <&mii_phy_tx_clk>, <&gmac_int_tx_clk>;
+			clock-output-names = "gmac_tx";
+		};
+
 		/*
 		 * Dummy clock used by output clocks
 		 */