ARM: tegra: Add CEC support for Tegra124

Add support for the Tegra CEC IP to the Tegra124 DTSI and link it to the
HDMI controller via phandle.
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra124.dtsi

@@ -124,7 +124,7 @@
 			nvidia,head = <1>;
 		};
 
-		hdmi@54280000 {
+		hdmi: hdmi@54280000 {
 			compatible = "nvidia,tegra124-hdmi";
 			reg = <0x0 0x54280000 0x0 0x00040000>;
 			interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>;
@@ -852,6 +852,16 @@
 		status = "disabled";
 	};
 
+	cec@70015000 {
+		compatible = "nvidia,tegra124-cec";
+		reg = <0x0 0x70015000 0x0 0x00001000>;
+		interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&tegra_car TEGRA124_CLK_CEC>;
+		clock-names = "cec";
+		status = "disabled";
+		hdmi-phandle = <&hdmi>;
+	};
+
 	soctherm: thermal-sensor@700e2000 {
 		compatible = "nvidia,tegra124-soctherm";
 		reg = <0x0 0x700e2000 0x0 0x600 /* SOC_THERM reg_base */