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

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Message-ID: <CACRpkdY5sOz6a1P23f2hs8UL__O2cBtDdMcHt1nxSX59ZOBzaQ@mail.gmail.com>
Date:   Thu, 8 Sep 2022 14:06:13 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Martyn Welch <martyn.welch@...labora.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        kernel@...labora.com, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] dt-bindings: gpio: pca95xx: add entry for pcal6534
 and PI4IOE5V6534Q

On Wed, Aug 31, 2022 at 3:34 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:

> If you have specific+fallback compatible (e.g. diodes,pi4ioe5v6534q,
> nxp,pcal6534), you can always introduce changes in the driver because it
> will match to the specific one (diodes). You could even introduce
> incompatible changes, if you insist, and the effect would be the same as
> adding now two compatibles in the driver.

I know, what I mean is that this binding should probably have fallback
compatibles for the TI, Exar, Onnn and Maxim compatibles listed in
the bindings, I bet they are all compatible with some nxp,pcaNNNN.

We could fix that, perhaps.

Yours,
Linus Walleij