Re: small brainstorm for the problem I have

[Bartosz Golaszewski <brgl@xxxxxxxx>]

On Mon, Feb 10, 2025 at 10:31 AM Andy Shevchenko
<andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
>
>
> I have a device that uses SPI bitbang (which is physically represented by bunch
> of GPIOs). I want to have a driver of that device to use SPI GPIO driver, but...
>
> 1) SPI GPIO has an established DT schema and hardcoded GPIO line names in the
> driver.
>
> 2) The firmware for the device uses already some names for the GPIO lines that
> not compatible with SPI GPIO schema.
>
> So, what would be the best approach here?
>
> I was thinking about the following:
> 1) Use GPIO aggregator to fake the chip that will provide necessary names.
>
> 2) Hack the GPIO library to add a quirk for this specific device to translate
> the line names.
>
> 3) ...your variant...
>

I would go with #1 of course - as it has the least impact on the
kernel - but setting the names is not yet available upstream. I'm
Cc'ing Koichiro Den who's working on adding support for it.

Bart