Re: [PATCH v4 1/2] gpio: Add support for IDT 79RC3243x GPIO controller

[Andy Shevchenko]

On Wed, Apr 28, 2021 at 1:51 AM Michael Walle <michael@xxxxxxxx> wrote:
> Am 2021-04-26 12:29, schrieb Andy Shevchenko:
> > On Mon, Apr 26, 2021 at 12:55 PM Thomas Bogendoerfer
> > <tsbogend@xxxxxxxxxxxxxxxx> wrote:
> >
> > 2) there is gpio-regmap generic code, that may be worth
> > considering.
>
> This driver uses memory mapped registers. While that is
> also possible with gpio-regmap, there is one drawback:
> it assumes gpiochip->can_sleep = true for now, see [1].
> Unfortunately, there is no easy way to ask the regmap
> if its mmio/fastio.

I don't see how it is an impediment.
Prerequisite patch?

> [1]
> https://elixir.bootlin.com/linux/v5.12/source/drivers/gpio/gpio-regmap.c#L257



-- 
With Best Regards,
Andy Shevchenko