arm64: tegra: Enable gpu on P2530

This adds the gpu regulator and enables the gpu node.

Change-Id: I8a0f580fa600d8f37fb3fa497cf657abf2905d5f
Signed-off-by: Aaron Kling <webgeek1234@gmail.com>

arch/arm64/boot/dts/nvidia/tegra210-p2530.dtsi

@@ -22,6 +22,11 @@
 		reg = <0x0 0x80000000 0x0 0xc0000000>;
 	};
 
+	gpu@57000000 {
+		vdd-supply = <&vdd_gpu>;
+		status = "okay";
+	};
+
 	/* debug port */
 	serial@70006000 {
 		/delete-property/ dmas;
@@ -310,4 +315,15 @@
 		compatible = "arm,psci-0.2";
 		method = "smc";
 	};
+
+	vdd_gpu: regulator-vdd-gpu {
+		compatible = "pwm-regulator";
+		pwms = <&pwm 1 8000>;
+		regulator-name = "VDD_GPU";
+		regulator-min-microvolt = <710000>;
+		regulator-max-microvolt = <1320000>;
+		enable-gpios = <&pmic 6 GPIO_ACTIVE_HIGH>;
+		regulator-ramp-delay = <160>;
+		regulator-enable-ramp-delay = <2000>;
+	};
 };