On Mon, Feb 20, 2017 at 04:18:54PM +0100, Enric Balletbo i Serra wrote:
> From: Benson Leung <bleung@xxxxxxxxxxxx>
>
> This patch add documentation for binding of USB Type C cable detection
> mechanism is using EXTCON subsystem. The device can detect the presence
> of display out but it may also detect other external accessories when
> external accessories is attached or detached.
>
> Signed-off-by: Benson Leung <bleung@xxxxxxxxxxxx>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/extcon/extcon-cros-ec.txt | 24 ++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/extcon/extcon-cros-ec.txt
>
> diff --git a/Documentation/devicetree/bindings/extcon/extcon-cros-ec.txt b/Documentation/devicetree/bindings/extcon/extcon-cros-ec.txt
> new file mode 100644
> index 0000000..3576869
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/extcon/extcon-cros-ec.txt
> @@ -0,0 +1,24 @@
> +ChromeOS EC Type-C Extcon device
Extcon is a Linux term. Devicetree describes the h/w.
> +
> +On ChromeOS systems with USB Type C ports, the ChromeOS Embedded Controller is
> +able to detect the state of external accessories such as display adapters
> +or USB devices when said accessories are attached or detached.
> +
> +The node for this device must be under a cros-ec node like google,cros-ec-spi
> +or google,cros-ec-i2c.
> +
> +Required properties:
> +- compatible: Should be "google,extcon-cros-ec".
Perhaps something indicating this is USB Type C related.
> +- google,usb-port-id: Specifies the USB port ID to use.
What are the choices here? Most likely this should be some phandle back
to the USB controller or hub.
> +
> +Example:
> + cros-ec@0 {
> + compatible = "google,cros-ec-i2c";
> +
> + ...
> +
> + extcon {
> + compatible = "google,extcon-cros-ec";
> + google,usb-port-id = <0>;
> + };
> + }
> --
> 2.9.3
>
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