Re: [PATCH 05/33] gpio: add generic single-register fixed-direction GPIO driver

[Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx>]

On Tue, Aug 30, 2016 at 09:08:03AM +0300, Alexander Shiyan wrote:
> >Вторник, 30 августа 2016, 2:12 +03:00 от Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx>:
> >
> >On Mon, Aug 29, 2016 at 09:39:54PM +0200, Robert Jarzmik wrote:
> >> Hi Russell,
> >> 
> >> Russell King < rmk+kernel@xxxxxxxxxxxxxxx > writes:
> >> 
> >> > Add a simple, generic, single register fixed-direction GPIO driver.
> >> > This is able to support a single register where a fixed number of
> >> > bits are used for input and a fixed number of bits used for output.
> >> >
> >> > Signed-off-by: Russell King < rmk+kernel@xxxxxxxxxxxxxxx >
> 
> There is a GPIO driver which already performs these tasks.
> Plaease take a look on the gpio-74xx-mmio driver.

I did, and no it doesn't, because:

1. It is either all-in or all-out, it doesn't support a mixture of
   fixed-directions for a single register.
2. It is DT-only, I need it for legacy platforms.
3. It uses the bgpio stuff, which is unsuitable for reasons already
   covered in a previous reply.

So, gpio-74xx-mmio is unsuitable.

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