On Fri, Aug 23, 2019 at 03:57:13PM +0800, Chunfeng Yun wrote:
> It's used to support dual role switch via GPIO when use Type-B
> receptacle, typically the USB ID pin is connected to an input
> GPIO, and also used to enable/disable device when the USB Vbus
> pin is connected to an input GPIO.
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
> ---
> v9~v10 no changes
>
> v8 changes:
> 1. rename the title
> 2. change the compatible as "linux,usb-conn-gpio" instead of
> "linux,typeb-conn-gpio"
I don't think that is an improvement. How about 'gpio-usb-b-connector'
to be consistent.
>
> v7 changes:
> 1. add description for device only mode
>
> v6 changes:
> 1. remove status and port nodes in example
> 2. make vbus-supply as optional property
>
> v5 changes:
> 1. treat type-B connector as child device of USB controller's, but not
> as a separate virtual device, suggested by Rob
> 2. put connector's port node under connector node, suggested by Rob
>
> v4 no changes
>
> v3 changes:
> 1. treat type-B connector as a virtual device, but not child device of
> USB controller's
>
> v2 changes:
> 1. new patch to make binding clear suggested by Hans
> ---
> .../devicetree/bindings/usb/usb-conn-gpio.txt | 31 +++++++++++++++++++
> 1 file changed, 31 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
>
> diff --git a/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt b/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
> new file mode 100644
> index 000000000000..d4d107fedc22
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/usb-conn-gpio.txt
> @@ -0,0 +1,31 @@
> +USB GPIO Based Connection Detection
> +
> +This is typically used to switch dual role mode from the USB ID pin connected
> +to an input GPIO, and also used to enable/disable device mode from the USB
> +Vbus pin connected to an input GPIO.
> +
> +Required properties:
> +- compatible : should include "linux,usb-conn-gpio" and "usb-b-connector".
> +- id-gpios, vbus-gpios : input gpios, either one of them must be present,
> + and both can be present as well.
> + see connector/usb-connector.txt
> +
> +Optional properties:
> +- vbus-supply : can be present if needed when supports dual role mode.
> + see connector/usb-connector.txt
> +
> +- Sub-nodes:
> + - port : can be present.
> + see graph.txt
> +
> +Example:
> +
> +&mtu3 {
> + connector {
> + compatible = "linux,usb-conn-gpio", "usb-b-connector";
> + label = "micro-USB";
'label' is for a human identifying a particular connector when there are
multiple (of the same type). So not a great example here.
> + type = "micro";
> + id-gpios = <&pio 12 GPIO_ACTIVE_HIGH>;
> + vbus-supply = <&usb_p0_vbus>;
> + };
> +};
> --
> 2.23.0
>
