On Thu, Aug 21, 2025 at 12:17:41AM +0800, Jisheng Zhang wrote:
> Currently, the usb251xb assumes i2c control, and the corresponding
> dt node looks like the following:
>
> i2c {
> usb-hub@2c {
> compatible = "microchip,usb2512b";
> reg = <0x2c>;
> reset-gpios = <&porta 8 GPIO_ACTIVE_LOW>;
> };
> };
Above is redundant, obvious from stagtement that USB can be a device on
I2C bus. Just keep it simple.
>
> But from HW point of view, the hub supports usage case without any i2c
> control, I.E we only want the gpio controls, for example the following
> dt node:
>
> usb-hub {
> compatible = "microchip,usb2512b";
> reset-gpios = <&porta 8 GPIO_ACTIVE_LOW>;
> };
>
> Modify the dt-binding of usb2512b to support this usage case, and add
> usage example to the examples section.
>
> Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx>
> ---
> Documentation/devicetree/bindings/usb/usb251xb.yaml | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Best regards,
Krzysztof
