Re: [PATCH 0/4] add support for bias pull-disable

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>]

On Wed, Jul 13, 2022 at 03:14:17PM +0200, Nuno Sá wrote:
> The gpio core looks at 'FLAG_BIAS_DISABLE' in preparation of calling the
> gpiochip 'set_config()' hook. However, AFAICT, there's no way that this
> flag is set because there's no support for it in firwmare code. Moreover,
> in 'gpiod_configure_flags()', only pull-ups and pull-downs are being
> handled.

Isn't it enough?

> On top of this, there are some users that are looking at
> 'PIN_CONFIG_BIAS_DISABLE' in the 'set_config()' hook. So, unless I'm
> missing something, it looks like this was never working for these chips.

It seems you are looking into wrong source of issues. Isn't it a issue of
particular pin control driver?

> Note that the ACPI case is only compiled tested. At first glance, it seems
> the current patch is enough but i'm not really sure...
> 
> As a side note, this came to my attention during this patchset [1]
> (and, ofr OF,  was tested with it).

-- 
With Best Regards,
Andy Shevchenko