[PATCH V4 1/8] drivers/acpi: Add support for Wifi band RF mitigations

[Rafael J. Wysocki]

On Wed, Jun 21, 2023 at 7:47 AM Evan Quan <evan.quan at amd.com> wrote:
>
> From: Mario Limonciello <mario.limonciello at amd.com>
>
> Due to electrical and mechanical constraints in certain platform designs
> there may be likely interference of relatively high-powered harmonics of
> the (G-)DDR memory clocks with local radio module frequency bands used
> by Wifi 6/6e/7.
>
> To mitigate this, AMD has introduced an ACPI based mechanism that
> devices can use to notify active use of particular frequencies so
> that devices can make relative internal adjustments as necessary
> to avoid this resonance.
>
> In order for a device to support this, the expected flow for device
> driver or subsystems:
>
> Drivers/subsystems contributing frequencies:
>
> 1) During probe, check `wbrf_supported_producer` to see if WBRF supported

The prefix should be acpi_wbrf_ or acpi_amd_wbrf_ even, so it is clear
that this uses ACPI and is AMD-specific.

Whether or not there needs to be an intermediate library wrapped
around this is a different matter.