dt-bindings: gpio: Add Tegra238 support

Extend the existing Tegra186 GPIO controller device tree bindings with
support for the GPIO controllers found on Tegra238. Tegra238 has two
GPIO controllers: the main controller and always-on (AON) controller.
The number of pins is slightly different, but the programming model
remains the same.

Add a new header, include/dt-bindings/gpio/nvidia,tegra238-gpio.h,
that defines port IDs as well as the TEGRA238_MAIN_GPIO() helper,
both of which are used in conjunction to create a unique specifier
for each pin.

Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260514124835.108532-1-pshete@nvidia.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

Documentation/devicetree/bindings/gpio/nvidia,tegra186-gpio.yaml

@@ -85,6 +85,8 @@ properties:
       - nvidia,tegra194-gpio-aon
       - nvidia,tegra234-gpio
       - nvidia,tegra234-gpio-aon
+      - nvidia,tegra238-gpio
+      - nvidia,tegra238-gpio-aon
       - nvidia,tegra256-gpio
       - nvidia,tegra264-gpio
       - nvidia,tegra264-gpio-uphy
@@ -163,6 +165,7 @@ allOf:
               - nvidia,tegra186-gpio
               - nvidia,tegra194-gpio
               - nvidia,tegra234-gpio
+              - nvidia,tegra238-gpio
               - nvidia,tegra256-gpio
               - nvidia,tegra264-gpio
               - nvidia,tegra264-gpio-uphy
@@ -180,6 +183,7 @@ allOf:
               - nvidia,tegra186-gpio-aon
               - nvidia,tegra194-gpio-aon
               - nvidia,tegra234-gpio-aon
+              - nvidia,tegra238-gpio-aon
               - nvidia,tegra264-gpio-aon
     then:
       properties:
@@ -192,6 +196,8 @@ allOf:
         compatible:
           contains:
             enum:
+              - nvidia,tegra238-gpio
+              - nvidia,tegra238-gpio-aon
               - nvidia,tegra264-gpio
               - nvidia,tegra264-gpio-uphy
               - nvidia,tegra264-gpio-aon

include/dt-bindings/gpio/nvidia,tegra238-gpio.h

@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
+/* Copyright (c) 2026, NVIDIA CORPORATION. All rights reserved. */
+
+/*
+ * This header provides constants for binding nvidia,tegra238-gpio*.
+ *
+ * The first cell in Tegra's GPIO specifier is the GPIO ID. The macros below
+ * provide names for this.
+ *
+ * The second cell contains standard flag values specified in gpio.h.
+ */
+
+#ifndef _DT_BINDINGS_GPIO_TEGRA238_GPIO_H
+#define _DT_BINDINGS_GPIO_TEGRA238_GPIO_H
+
+#include <dt-bindings/gpio/gpio.h>
+
+/* GPIOs implemented by main GPIO controller */
+#define TEGRA238_MAIN_GPIO_PORT_A   0
+#define TEGRA238_MAIN_GPIO_PORT_B   1
+#define TEGRA238_MAIN_GPIO_PORT_C   2
+#define TEGRA238_MAIN_GPIO_PORT_D   3
+#define TEGRA238_MAIN_GPIO_PORT_E   4
+#define TEGRA238_MAIN_GPIO_PORT_F   5
+#define TEGRA238_MAIN_GPIO_PORT_G   6
+#define TEGRA238_MAIN_GPIO_PORT_H   7
+#define TEGRA238_MAIN_GPIO_PORT_J   8
+#define TEGRA238_MAIN_GPIO_PORT_K   9
+#define TEGRA238_MAIN_GPIO_PORT_L  10
+#define TEGRA238_MAIN_GPIO_PORT_M  11
+#define TEGRA238_MAIN_GPIO_PORT_N  12
+#define TEGRA238_MAIN_GPIO_PORT_P  13
+#define TEGRA238_MAIN_GPIO_PORT_Q  14
+#define TEGRA238_MAIN_GPIO_PORT_R  15
+#define TEGRA238_MAIN_GPIO_PORT_S  16
+#define TEGRA238_MAIN_GPIO_PORT_T  17
+#define TEGRA238_MAIN_GPIO_PORT_U  18
+#define TEGRA238_MAIN_GPIO_PORT_V  19
+#define TEGRA238_MAIN_GPIO_PORT_W  20
+#define TEGRA238_MAIN_GPIO_PORT_X  21
+
+#define TEGRA238_MAIN_GPIO(port, offset) \
+	((TEGRA238_MAIN_GPIO_PORT_##port * 8) + (offset))
+
+/* GPIOs implemented by AON GPIO controller */
+#define TEGRA238_AON_GPIO_PORT_AA 0
+#define TEGRA238_AON_GPIO_PORT_BB 1
+#define TEGRA238_AON_GPIO_PORT_CC 2
+#define TEGRA238_AON_GPIO_PORT_DD 3
+#define TEGRA238_AON_GPIO_PORT_EE 4
+#define TEGRA238_AON_GPIO_PORT_FF 5
+#define TEGRA238_AON_GPIO_PORT_GG 6
+#define TEGRA238_AON_GPIO_PORT_HH 7
+
+#define TEGRA238_AON_GPIO(port, offset) \
+	((TEGRA238_AON_GPIO_PORT_##port * 8) + (offset))
+
+#endif