Re: [PATCH v3 1/2] ACPI: TAD: introduce acpi_has_rtc()

["Ard Biesheuvel" <ardb@kernel.org>]

Hello Hamza,

On Mon, 26 Oct 2026, at 16:21, Hamza Mahfooz wrote:
> The same RTC may also be accessible by other means, like the EFI
> GetTime() and SetTime() runtime services used by rtc-efi, which are best
> avoided if there is a native ACPI interface to the RTC.
>
> To allow other RTC drivers to stand down in that case, add an exported
> helper, acpi_has_rtc(), that returns true if there is a TAD the driver
> will register an RTC class device for.
>
> The helper looks for a platform device matching the driver's ID table
> whose _GCP indicates real time support, like acpi_tad_probe() checks,
> instead of checking whether the driver has bound to such a device, so
> that callers need not depend on the order in which drivers are probed.
>
> Suggested-by: Ard Biesheuvel <ardb@kernel.org>
> Signed-off-by: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>
> ---
> v1: 
> https://lore.kernel.org/r/20261022211304.2285792-1-hamzamahfooz@linux.microsoft.com/
> v2:
> - Rename acpi_tad_rtc_available() to acpi_has_rtc(), move it to within
>   acpi-tad (which allows us to simplify it quite a bit) and declare it
>   in linux/acpi.h. (Ard)
> - Add acpi_disabled check. (Ard)

Next time, please use a cover latter when sending a series, so that you
can capture these changelogs in one place.

The series looks good to me:

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>

I'll let Rafael and Alexandre decide how to queue this, once they are
happy with the patches as well.