Re: [PATCH v3 1/2] ACPI: scan: do not enumerate MSFT8000 as a serial bus slave

[Rafael J. Wysocki (Intel)]

On Sat, Aug 29, 2026 at 4:55 PM Edward Blair <edward.blair@xxxxxxxxx> wrote:
>
> MSFT8000 represents the Windows Resource Hub Proxy. Its SerialBus
> resources describe connections that Windows exposes to userspace rather
> than a physical peripheral attached to a serial bus.
>
> Treat the device like other ACPI nodes which contain SerialBus resources
> without being serial bus slaves. This keeps the ACPI device present while
> preventing the resources from being instantiated as I2C, SPI or serdev
> clients and conflicting with the actual devices.
>
> Suggested-by: Armin Wolf <W_Armin@xxxxxx>
> Signed-off-by: Edward Blair <edward.blair@xxxxxxxxx>

Acked-by: Rafael J. Wysocki (Intel) <rafael@xxxxxxxxxx>

and please route it as needed or let me know if you want me to pick it up.

Thanks!

> ---
>  drivers/acpi/scan.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 7dcf78419..608527cda 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -1770,6 +1770,11 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
>          * attached to a serial bus at all.
>          */
>                 {"MSHW0028", },
> +       /*
> +        * MSFT8000 is a Windows Resource Hub Proxy device. Its SerialBus
> +        * resources grant userspace access and do not describe a slave.
> +        */
> +               {"MSFT8000", },
>         /*
>          * HIDs of device with an UartSerialBusV2 resource for which userspace
>          * expects a regular tty cdev to be created (instead of the in kernel
> --
> 2.55.0
>