diff mbox series

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

Message ID 20240210070934.2549994-2-swboyd@chromium.org
State New
Headers show
Series platform/chrome: Add DT USB/DP muxing/topology to Trogdor | expand

Commit Message

Stephen Boyd Feb. 10, 2024, 7:09 a.m. UTC 
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@linaro.org>
Cc: Bartosz Golaszewski <brgl@bgdev.pl>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
Cc: Conor Dooley <conor+dt@kernel.org>
Cc: Lee Jones <lee@kernel.org>
Cc: Benson Leung <bleung@chromium.org>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: <linux-gpio@vger.kernel.org>
Cc: <devicetree@vger.kernel.org>
Cc: <chrome-platform@lists.linux.dev>
Cc: Pin-yen Lin <treapking@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@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 mbox series

Patch

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@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@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#