arm64: tegra: Enable gpu on P2894

This adds the gpu regulator and enables the gpu node.

Change-Id: I7d9580967edf9af4c31d500608f880eeb9d1e0b5
Signed-off-by: Aaron Kling <webgeek1234@gmail.com>

arch/arm64/boot/dts/nvidia/tegra210-p2894.dtsi

@@ -20,6 +20,11 @@
 		reg = <0x0 0x80000000 0x0 0xc0000000>;
 	};
 
+	gpu@57000000 {
+		vdd-supply = <&vdd_gpu>;
+		status = "okay";
+	};
+
 	pinmux: pinmux@700008d4 {
 		status = "okay";
 		pinctrl-names = "boot";
@@ -1325,6 +1330,10 @@
 		status = "okay";
 	};
 
+	pwm@7000a000 {
+		status = "okay";
+	};
+
 	i2c@7000d000 {
 		status = "okay";
 		clock-frequency = <400000>;
@@ -1830,4 +1839,16 @@
 		enable-active-high;
 		gpio-open-drain;
 	};
+
+	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 = <80>;
+		regulator-enable-ramp-delay = <2000>;
+		regulator-settling-time-us = <160>;
+	};
 };