[PATCH 01/22] dt-bindings: gpio: Add binding for ChromeOS EC GPIO controller

[Stephen Boyd]

The ChromeOS embedded controller (EC) supports setting the state of
GPIOs when the system is unlocked, and getting the state of GPIOs in all
cases. The GPIOs are on the EC itself, so the EC acts similar to a GPIO
expander. Add a binding to describe these GPIOs in DT so that other
devices described in DT can read the GPIOs on the EC.

Cc: Linus Walleij <linus.walleij at linaro.org>
Cc: Bartosz Golaszewski <brgl at bgdev.pl>
Cc: Rob Herring <robh+dt at kernel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt at linaro.org>
Cc: Conor Dooley <conor+dt at kernel.org>
Cc: Lee Jones <lee at kernel.org>
Cc: Benson Leung <bleung at chromium.org>
Cc: Guenter Roeck <groeck at chromium.org>
Cc: <linux-gpio at vger.kernel.org>
Cc: <devicetree at vger.kernel.org>
Cc: <chrome-platform at lists.linux.dev>
Cc: Pin-yen Lin <treapking at chromium.org>
Signed-off-by: Stephen Boyd <swboyd at chromium.org>
---
 .../bindings/gpio/google,cros-ec-gpio.yaml    | 49 +++++++++++++++++++
 .../bindings/mfd/google,cros-ec.yaml          |  3 ++
 2 files changed, 52 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/google,cros-ec-gpio.yaml

diff --git a/Documentation/devicetree/bindings/gpio/google,cros-ec-gpio.yaml b/Documentation/devicetree/bindings/gpio/google,cros-ec-gpio.yaml
new file mode 100644
index 000000000000..a9f1d7784070
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/google,cros-ec-gpio.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/google,cros-ec-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIOs controlled by ChromeOS EC
+
+maintainers:
+  - Stephen Boyd <swboyd at chromium.org>
+
+description:
+  Google's ChromeOS EC has a gpio controller inside the Embedded Controller
+  (EC) and controlled via a host-command interface. The node for this
+  device should be under a cros-ec node like google,cros-ec-spi.
+
+properties:
+  compatible:
+    const: google,cros-ec-gpio
+
+  '#gpio-cells':
+    const: 2
+
+  gpio-controller: true
+
+required:
+  - compatible
+  - '#gpio-cells'
+  - gpio-controller
+
+additionalProperties: false
+
+examples:
+  - |
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      cros-ec at 0 {
+        compatible = "google,cros-ec-spi";
+        reg = <0>;
+        interrupts = <101 0>;
+        gpio {
+          compatible = "google,cros-ec-gpio";
+          gpio-controller;
+          #gpio-cells = <2>;
+        };
+      };
+    };
diff --git a/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml b/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
index e1ca4f297c6d..ded396b28fba 100644
--- a/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
+++ b/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
@@ -93,6 +93,9 @@ properties:
   '#size-cells':
     const: 0
 
+  gpio:
+    $ref: /schemas/gpio/google,cros-ec-gpio.yaml#
+
   typec:
     $ref: /schemas/chrome/google,cros-ec-typec.yaml#
 
-- 
https://chromeos.dev