Re: [PATCH] gpio: aggregator: restore the set_config operation

[Thomas Richard]

On 10/3/25 3:59 PM, Thomas Richard wrote:
>>
>> Is there any specific reason why you are doing this unconditionally,
>> instead of only when any of its parents support .set_config(), like
>> was done before?
>>
> My idea was: it will be handled by the core, so the if statement is not
> needed. But if we conditionally add the operation we can save some time
> in case there is no chip supporting set_config().

I just remembered the true reason why I'm doing this unconditionally.

The user of the forwarder can override GPIO operations like I do in the
pinctrl-upboard driver [1].
And now we can add/remove GPIO desc at runtime, if set_config() is set
conditionally in gpiochip_fwd_desc_add() it will override the custom
set_config() operation.
So the only solution is to set the set_config() operation
unconditionally in devm_gpiochip_fwd_alloc().

[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pinctrl/pinctrl-upboard.c#n1044

Thomas