[PATCH 08/11] arm64: tegra: Add PWM regulator for CPU rail on Jetson TX1

[Penny Chiu]

The CPU rail on Jetson TX1 is supplied by a Open Voltage Regulator
(OVR) which is controlled by PWM signals, and the PWM signals are
generated by DFLL PWM controller. So this patch adds DFLL_PWM
device-tree node and a PWM regulator node for the OVR.

Signed-off-by: Penny Chiu <pchiu at nvidia.com>
---
 arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi     | 40 ++++++++++++++++++++++
 arch/arm64/boot/dts/nvidia/tegra210-p2371-2180.dts | 23 +++++++++++++
 2 files changed, 63 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi b/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
index 316c92c..9d02db2 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
@@ -42,4 +42,44 @@
 			clock-frequency = <32768>;
 		};
 	};
+
+	pwm_dfll: pwm at 70110000 {
+		compatible = "nvidia,tegra210-dfll-pwm";
+		reg = <0x0 0x70110000 0x0 0x400>;
+		clocks = <&tegra_car TEGRA210_CLK_DFLL_REF>;
+		clock-names = "ref";
+		#pwm-cells = <2>;
+		pwm-regulator = <&cpu_ovr_reg>;
+		status = "disable";
+	};
+
+	pwm_regulators {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu_ovr_reg: pwm-regulator at 0 {
+			status = "okay";
+			reg = <0>;
+			compatible = "pwm-regulator";
+			pwms = <&pwm_dfll 0 2500>;
+			regulator-name = "vdd_cpu";
+			regulator-min-microvolt = <708000>;
+			regulator-max-microvolt = <1322400>;
+			regulator-always-on;
+			regulator-boot-on;
+			voltage-table =
+				<708000 0>, <727200 1>, <746400 2>,
+				<765600 3>, <784800 4>, <804000 5>,
+				<823200 6>, <842400 7>, <861600 8>,
+				<880800 9>, <900000 10>, <919200 11>,
+				<938400 12>, <957600 13>, <976800 14>,
+				<996000 15>, <1015200 16>, <1034400 17>,
+				<1053600 18>, <1072800 19>, <1092000 20>,
+				<1111200 21>, <1130400 22>, <1149600 23>,
+				<1168800 24>, <1188000 25>, <1207200 26>,
+				<1226400 27>, <1245600 28>, <1264800 29>,
+				<1284000 30>, <1303200 31>, <1322400 32>;
+		};
+	};
 };
diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p2371-2180.dts b/arch/arm64/boot/dts/nvidia/tegra210-p2371-2180.dts
index 683b339..c9fd59a 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210-p2371-2180.dts
+++ b/arch/arm64/boot/dts/nvidia/tegra210-p2371-2180.dts
@@ -6,4 +6,27 @@
 / {
 	model = "NVIDIA Jetson TX1 Developer Kit";
 	compatible = "nvidia,p2371-2180", "nvidia,tegra210";
+
+	pinmux: pinmux at 700008d4 {
+		dvfs_pwm_active_state: dvfs_pwm_active {
+			dvfs_pwm_pbb1 {
+				nvidia,pins = "dvfs_pwm_pbb1";
+				nvidia,tristate = <TEGRA_PIN_DISABLE>;
+			};
+		};
+
+		dvfs_pwm_inactive_state: dvfs_pwm_inactive {
+			dvfs_pwm_pbb1 {
+				nvidia,pins = "dvfs_pwm_pbb1";
+				nvidia,tristate = <TEGRA_PIN_ENABLE>;
+			};
+		};
+	};
+
+	pwm_dfll: pwm at 70110000 {
+		status = "okay";
+		pinctrl-names = "dvfs_pwm_enable", "dvfs_pwm_disable";
+		pinctrl-0 = <&dvfs_pwm_active_state>;
+		pinctrl-1 = <&dvfs_pwm_inactive_state>;
+	};
 };
-- 
2.8.1