ARM: dts: imx6dl-prtmvt: configure ethernet reference clock parent

On this board the PHY is the ref clock provider. So, configure ethernet
reference clock as input.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6dl-prtmvt.dts

@@ -193,6 +193,7 @@ clk50m_phy: phy-clock {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
 		clock-frequency = <50000000>;
+		clock-output-names = "enet_ref_pad";
 	};
 
 	reg_1v8: regulator-1v8 {
@@ -293,8 +294,10 @@ &can2 {
 };
 
 &clks {
-	assigned-clocks = <&clks IMX6QDL_CLK_LDB_DI0_SEL>;
-	assigned-clock-parents = <&clks IMX6QDL_CLK_PLL5_VIDEO_DIV>;
+	clocks = <&clk50m_phy>;
+	clock-names = "enet_ref_pad";
+	assigned-clocks = <&clks IMX6QDL_CLK_LDB_DI0_SEL>, <&clks IMX6QDL_CLK_ENET_REF_SEL>;
+	assigned-clock-parents = <&clks IMX6QDL_CLK_PLL5_VIDEO_DIV>, <&clk50m_phy>;
 };
 
 &ecspi1 {
@@ -314,10 +317,6 @@ &fec {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_enet>;
 	phy-mode = "rmii";
-	clocks = <&clks IMX6QDL_CLK_ENET>,
-		 <&clks IMX6QDL_CLK_ENET>,
-		 <&clk50m_phy>;
-	clock-names = "ipg", "ahb", "ptp";
 	phy-handle = <&rmii_phy>;
 	status = "okay";