Re: [PATCH] gpio: shared: call gpio_chip::of_xlate() if set

[Linus Walleij <linusw@kernel.org>]

On Mon, Mar 16, 2026 at 2:52 PM Bartosz Golaszewski
<bartosz.golaszewski@oss.qualcomm.com> wrote:

> OF-based GPIO controller drivers may provide a translation function that
> calculates the real chip offset from whatever devicetree sources
> provide. We need to take this into account in the shared GPIO management
> and call of_xlate() if it's provided and adjust the entry->offset we
> initially set when scanning the tree.
>
> To that end: modify the shared GPIO API to take the GPIO chip as
> argument on setup (to avoid having to rcu_dereference() it from the GPIO
> device) and protect the access to entry->offset with the existing lock.
>
> Fixes: a060b8c511ab ("gpiolib: implement low-level, shared GPIO support")
> Reported-by: Jon Hunter <jonathanh@nvidia.com>
> Closes: https://lore.kernel.org/all/921ba8ce-b18e-4a99-966d-c763d22081e2@nvidia.com/
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

That was a tricky one!
Reviewed-by: Linus Walleij <linusw@kernel.org>

Yours,
Linus Walleij