Re: [PATCH v3 1/3] dt-bindings: gpio: Add Tegra264 support

Extend the existing Tegra186 GPIO controller device tree bindings with
support for the GPIO controller found on Tegra264. The number of pins
is slightly different, but the programming model remains the same.

Add a new header, include/dt-bindings/gpio/tegra264-gpio.h,
that defines port IDs as well as the TEGRA264_MAIN_GPIO() helper,
both of which are used in conjunction to create a unique specifier
for each pin.

On Tegra, GPIO wake events are latched and routed via the PMC.
Document the standard DT property, wakeup-parent, which is a phandle to
the PMC interrupt controller that provides the parent wake interrupt
domain for the GPIO controller. If the property is absent the driver
falls back to a compatible-based lookup.

Signed-off-by: Prathamesh Shete <redacted>
---
Changes in v3:
  * Fix DT binding SPDX license to GPL-2.0-only OR BSD-2-Clause

Changes in v2:
  * Update DT binding to use “wakeup-parent” (drop custom nvidia,pmc).
  * Require “wakeup-parent” for Tegra264 compatibles in the binding.
  * Rename header file to "nvidia,tegra264-gpio.h".
---
 .../bindings/gpio/nvidia,tegra186-gpio.yaml   | 24 +++++++
 .../dt-bindings/gpio/nvidia,tegra264-gpio.h   | 62 +++++++++++++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 include/dt-bindings/gpio/nvidia,tegra264-gpio.h

diff --git a/Documentation/devicetree/bindings/gpio/nvidia,tegra186-gpio.yaml b/Documentation/devicetree/bindings/gpio/nvidia,tegra186-gpio.yaml
index 2bd620a1099b..b74fc3a8d80d 100644
--- a/Documentation/devicetree/bindings/gpio/nvidia,tegra186-gpio.yaml
+++ b/Documentation/devicetree/bindings/gpio/nvidia,tegra186-gpio.yaml

@@ -86,6 +86,9 @@ properties:
       - nvidia,tegra234-gpio
       - nvidia,tegra234-gpio-aon
       - nvidia,tegra256-gpio
+      - nvidia,tegra264-gpio
+      - nvidia,tegra264-gpio-uphy
+      - nvidia,tegra264-gpio-aon
 
   reg-names:
     items:

@@ -110,6 +113,12 @@ properties:
       ports, in the order the HW manual describes them. The number of entries
       required varies depending on compatible value.
 
+  wakeup-parent:
+    $ref: /schemas/types.yaml#/definitions/phandle