Re: [PATCH 2/5] dt-bindings: gpio: pca95xx: add entry for pcal6534 and PI4IOE5V6534Q

[Linus Walleij]

On Tue, Aug 30, 2022 at 9:50 AM Krzysztof Kozlowski
<krzysztof.kozlowski@xxxxxxxxxx> wrote:
> On 29/08/2022 16:39, Martyn Welch wrote:
> > The NXP PCAL6534 is a 34-bit I2C I/O expander similar to the PCAL6524. The
> > Diodes PI4IOE5V6534Q is a functionally identical chip provided by Diodes
> > Inc.
> >
> > Signed-off-by: Martyn Welch <martyn.welch@xxxxxxxxxxxxx>
>
> Then diodes should be followed by fallback (and use only one compatible
> to bind).

Ugh I don't think we have done a very good job at providing fallbacks
(several compatibles) for this hardware. Just looking at the list makes
me suspicious.

The fallback scheme is pretty hard to maintain when vendors are a bit
unclear on whether things are really compatible or not, and sometimes
they are compatible but rather not say :(

Yours,
Linus Walleij