Re: [PATCH 2/2] gpio: gpio-adg1414: New driver

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

Hi Kim,

On Tue, Jan 23, 2024 at 11:31 AM Paller, Kim Seer
<KimSeer.Paller@xxxxxxxxxx> wrote:

> > Locking here is simple enough that you could use the SPI regmap and
> > get it to do the serialization for you. And then you could possibly
> > reuse the gpio-regmap abstraction and get an even smaller footprint.
>
> I could not seem to figure out how to use the SPI regmap in this case.
> Since the number of daisy-chained devices depends on the length of
> data transferred with continuous transaction, I could not determine
> how to implement that using the SPI regmap. Or maybe I misunderstood
> the statement. However, is it still acceptable to use the current approach?

You just override or wrap with your own read/write callbacks if necessary
by defining a custom static struct regmap_bus.

For example in drivers/gpu/drm/panel/panel-ilitek-ili9322.c
I do this.

It may not save a lot of code in this case but it's still worth it because
we understand what regmap_read/write/update_bits do and reading
and understanding adg1414_set/get cognitively require more from us
as maintainers.

Yours,
Linus Walleij