linux-kernel - [PATCH 4.9 019/116] arm64: tegra: Add VDD

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Message-Id: <20170106213909.731296796@linuxfoundation.org>
Date:   Fri,  6 Jan 2017 22:43:01 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alexandre Courbot <acourbot@...dia.com>,
        Thierry Reding <treding@...dia.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 4.9 019/116] arm64: tegra: Add VDD_GPU regulator to Jetson TX1

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexandre Courbot <acourbot@...dia.com>

commit 5e6b9a89afceadb1ee45472098f7d20af260335c upstream.

Add the VDD_GPU regulator (a GPIO-enabled PWM regulator) to the Jetson
TX1 board. This addition allows the GPU to be used provided the
bootloader properly enabled the GPU node.

Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
Signed-off-by: Thierry Reding <treding@...dia.com>
[as pointed out by Thierry on IRC, nobody has reported a bug
 in the field, but using a new bootloader with a .dtb that
 has the incorrect data, it will crash on boot]
Fixes: 336f79c7b6d7 ("arm64: tegra: Add NVIDIA Jetson TX1 Developer Kit support")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

--- a/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
@@ -21,6 +21,10 @@
 		reg = <0x0 0x80000000 0x1 0x0>;
 	};
 
+	gpu@...00000 {
+		vdd-supply = <&vdd_gpu>;
+	};
+
 	/* debug port */
 	serial@...06000 {
 		status = "okay";
@@ -291,4 +295,18 @@
 			clock-frequency = <32768>;
 		};
 	};
+
+	regulators {
+		vdd_gpu: regulator@100 {
+			compatible = "pwm-regulator";
+			reg = <100>;
+			pwms = <&pwm 1 4880>;
+			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 = <1000>;
+		};
+	};
 };