From ba97758a63b78f7e494ebdfb74ba8a8af702a33a Mon Sep 17 00:00:00 2001
From: Aaron Kling <webgeek1234@gmail.com>
Date: Wed, 11 Jun 2025 13:53:38 -0500
Subject: [PATCH] arm64: tegra: Add NVIDIA Jetson Nano 2GB Developer Kit
 support

This devkit is very similar to P3450, except it has less RAM, no display
port, and only 3 USB host ports. Derive from P3450 and disable the
hardware that is unavailable.

GPIO PA6 is used to control the HDMI power rail and needs to be on for
hotplug detect to work. This is mapped to the 3.3V USB hub on P3450.
That USB rail is not used here, so delete the regulator to avoid
conflicts.

Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 arch/arm64/boot/dts/nvidia/Makefile           |  2 +
 .../boot/dts/nvidia/tegra210-p3541-0000.dts   | 59 +++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 arch/arm64/boot/dts/nvidia/tegra210-p3541-0000.dts

diff --git a/arch/arm64/boot/dts/nvidia/Makefile b/arch/arm64/boot/dts/nvidia/Makefile
index 171e08c94d5a2..b139cbd144422 100644
--- a/arch/arm64/boot/dts/nvidia/Makefile
+++ b/arch/arm64/boot/dts/nvidia/Makefile
@@ -3,6 +3,7 @@
 # Enables support for device-tree overlays
 DTC_FLAGS_tegra210-p2371-2180 := -@
 DTC_FLAGS_tegra210-p3450-0000 := -@
+DTC_FLAGS_tegra210-p3541-0000 := -@
 DTC_FLAGS_tegra186-p2771-0000 := -@
 DTC_FLAGS_tegra186-p3509-0000+p3636-0001 := -@
 DTC_FLAGS_tegra194-p2972-0000 := -@
@@ -19,6 +20,7 @@ dtb-$(CONFIG_ARCH_TEGRA_210_SOC) += tegra210-p2371-0000.dtb
 dtb-$(CONFIG_ARCH_TEGRA_210_SOC) += tegra210-p2371-2180.dtb
 dtb-$(CONFIG_ARCH_TEGRA_210_SOC) += tegra210-p2571.dtb
 dtb-$(CONFIG_ARCH_TEGRA_210_SOC) += tegra210-p3450-0000.dtb
+dtb-$(CONFIG_ARCH_TEGRA_210_SOC) += tegra210-p3541-0000.dtb
 dtb-$(CONFIG_ARCH_TEGRA_210_SOC) += tegra210-smaug.dtb
 dtb-$(CONFIG_ARCH_TEGRA_210_SOC) += tegra210-p2894-0050-a08.dtb
 dtb-$(CONFIG_ARCH_TEGRA_186_SOC) += tegra186-p2771-0000.dtb
diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p3541-0000.dts b/arch/arm64/boot/dts/nvidia/tegra210-p3541-0000.dts
new file mode 100644
index 0000000000000..b86e271dde0be
--- /dev/null
+++ b/arch/arm64/boot/dts/nvidia/tegra210-p3541-0000.dts
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "tegra210-p3450-0000.dts"
+
+/ {
+	model = "NVIDIA Jetson Nano 2GB Developer Kit";
+	compatible = "nvidia,p3541-0000", "nvidia,p3450-0000", "nvidia,tegra210";
+
+	memory@80000000 {
+		reg = <0x0 0x80000000 0x0 0x80000000>;
+	};
+
+	host1x@50000000 {
+		sor@54540000 {
+			status = "disabled";
+		};
+
+		dpaux@545c0000 {
+			status = "disabled";
+		};
+	};
+
+	padctl@7009f000 {
+		ports {
+			usb2-1 {
+				vbus-supply = <&vdd_hub_5v0>;
+			};
+
+			usb2-2 {
+				vbus-supply = <&vdd_hub_5v0>;
+			};
+
+			usb3-0 {
+				/delete-property/ vbus-supply;
+			};
+		};
+	};
+
+	regulator-vdd-hdmi-5v0 {
+		gpio = <&gpio TEGRA_GPIO(A, 6) GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+	};
+
+	/delete-node/ regulator-vdd-hub-3v3;
+
+	vdd_hub_5v0: regulator-vdd-hub-5v0 {
+		compatible = "regulator-fixed";
+
+		regulator-name = "VDD_HUB_5V0";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+
+		gpio = <&gpio TEGRA_GPIO(I, 2) GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+
+		vin-supply = <&vdd_5v0_sys>;
+	};
+};
-- 
2.47.3