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@xxxxxxxxxx> Cc: Bartosz Golaszewski <brgl@xxxxxxxx> Cc: Rob Herring <robh+dt@xxxxxxxxxx> Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@xxxxxxxxxx> Cc: Conor Dooley <conor+dt@xxxxxxxxxx> Cc: Lee Jones <lee@xxxxxxxxxx> Cc: Benson Leung <bleung@xxxxxxxxxxxx> Cc: Guenter Roeck <groeck@xxxxxxxxxxxx> Cc: <linux-gpio@xxxxxxxxxxxxxxx> Cc: <devicetree@xxxxxxxxxxxxxxx> Cc: <chrome-platform@xxxxxxxxxxxxxxx> Cc: Pin-yen Lin <treapking@xxxxxxxxxxxx> Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx> --- .../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@xxxxxxxxxxxx> + +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# -- https://chromeos.dev
