[PATCH AUTOSEL 6.17-5.4] ASoC: pxa: add GPIOLIB_LEGACY dependency

[Arnd Bergmann]

On Sat, Oct 25, 2025, at 17:55, Sasha Levin wrote:
>
> LLM Generated explanations, may be completely bogus:
>
> YES

It is indeed bogus.

> Rationale
> - Fixes a real build failure during COMPILE_TEST when legacy GPIO APIs
>   are disabled. The failure stems from `gpio_request_one()` in the PXA
>   AC97 support code: `sound/arm/pxa2xx-ac97-lib.c:374` uses legacy GPIO
>   (gpio_request_one/`GPIOF_OUT_INIT_HIGH`). When `GPIOLIB_LEGACY` is not
>   enabled, these legacy interfaces are not available, leading to the
>   implicit declaration error cited in the commit message.

The build error would only happen after we make GPIOLIB_LEGACY optional,
but in 6.17 it is still always-enabled.

>
> Notes on applicability
> - This backport is most relevant to stable series that already have the
>   `GPIOLIB_LEGACY` split. Older stable trees that predate
>   `GPIOLIB_LEGACY` either won’t need this change (no build break) or may
>   require adjusting the dependency accordingly.

On older kernels, this would actively break configurations that need
the symbols.

        Arnd