On Tue, Aug 19, 2025 at 11:22:51AM +0200, Krzysztof Kozlowski wrote:
> On Tue, Aug 19, 2025 at 08:22:15AM +0800, Jisheng Zhang wrote:
> > Make "reg" optional to allow the driver to be used to manage GPIO
> > based control of the device.
>
> I don't understand how optional reg allows or disallows anything for the
> driver. It's really not relevant to GPIO at all.
w/o this patch, then there will be DT check complains for the following
usb251xb usage:
usb-hub {
compatible = "microchip,usb2512b";
reset-gpios = <&porta 2 GPIO_ACTIVE_LOW>;
};
>
> Also feels wrong, but maybe you just lack proper, reasonable
> justification. Just explain carefully the hardware, not drivers.
It's simple, the hub allows usage w/o connecting to any i2c, see above
example for reference. But current dt-binding make the reg required.
Regards.