On 1/2/26 3:22 PM, Peter Robinson wrote:
On Fri, 2 Jan 2026 at 13:47, Marek Vasut <[email protected]> wrote:
On 1/2/26 1:56 PM, Heinrich Schuchardt wrote:
USB keyboards are identified via a USB interface descriptor or via USB
vendor and product IDs but never via the device-tree.
Remove the device-tree match string.
The commit message is wrong, you can actually describe USB devices in
DT, see e.g. Linux:
arch/arm/boot/dts/st/stm32mp15xx-dkx.dtsi: compatible =
"usb424,2514";
Documentation/devicetree/bindings/usb/microchip,usb2514.yaml: -
usb424,2514
I think there's nuance there because I think those USB hubs at times
can have a GPIO to control power or something like that and hence the
compat.
I can imagine laptop keyboard can have the same thing, either for power
regulator or for backlight under keys.
However, it seems this particular compatible string is ad-hoc and
unused. I wonder if this might break some users like RPi which supply
external DT and may depend on this support ?
I've never seen the USB keyboards described in any of the RPi DTs
OK
