linux-kernel - Re: [PATCH v6 1/8] dt-bindings: pinctrl: mediatek,mt6779-pinctrl: Pull pinctrl node changes from MT6795 document

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Message-ID: <CAL_JsqJ864ZM8qgqfuyKsS5H=gsVm=nOrikQ4cuObEVBJX75JQ@mail.gmail.com>
Date: Mon, 14 Oct 2024 14:02:37 -0500
From: Rob Herring <robh@...nel.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Yassine Oudjana <yassine.oudjana@...il.com>, Sean Wang <sean.wang@...nel.org>, 
	Linus Walleij <linus.walleij@...aro.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>, 
	Yassine Oudjana <y.oudjana@...tonmail.com>, Andy Teng <andy.teng@...iatek.com>, 
	linux-mediatek@...ts.infradead.org, linux-gpio@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 1/8] dt-bindings: pinctrl: mediatek,mt6779-pinctrl:
 Pull pinctrl node changes from MT6795 document

On Mon, Oct 14, 2024 at 3:27 AM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Il 11/10/24 18:56, Rob Herring ha scritto:
> > On Fri, Oct 11, 2024 at 03:03:46PM +0300, Yassine Oudjana wrote:
> >> From: Yassine Oudjana <y.oudjana@...tonmail.com>
> >>
> >> mediatek,pinctrl-mt6795.yaml has different node name patterns which match
> >> bindings of other MediaTek pin controllers, ref for pinmux-node.yaml which
> >> has a description of the pinmux property, as well as some additional
> >> descriptions for some pin configuration properties. Pull those changes
> >> into mediatek,mt6779-pinctrl.yaml and adjust the example DTS to match in
> >> preparation to combine the MT6795 document into it.
> >>
> >> Signed-off-by: Yassine Oudjana <y.oudjana@...tonmail.com>
> >> ---
> >>   .../pinctrl/mediatek,mt6779-pinctrl.yaml      | 38 ++++++++++++++-----
> >>   1 file changed, 28 insertions(+), 10 deletions(-)
> >>
> >> diff --git a/Documentation/devicetree/bindings/pinctrl/mediatek,mt6779-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/mediatek,mt6779-pinctrl.yaml
> >> index 3bbc00df5548d..352a88d7b135e 100644
> >> --- a/Documentation/devicetree/bindings/pinctrl/mediatek,mt6779-pinctrl.yaml
> >> +++ b/Documentation/devicetree/bindings/pinctrl/mediatek,mt6779-pinctrl.yaml
> >> @@ -111,12 +111,12 @@ allOf:
> >>           - "#interrupt-cells"
> >>
> >>   patternProperties:
> >> -  '-[0-9]*$':
> >> +  '-pins$':
> >
> > Worst case, this could be an ABI break. Best case, it's churn for
> > mt6779. Is it worth unifying?
> >
> All those MediaTek pinctrl bindings are mostly the same, where only the pin
> definitions in the binding header does actually change.
>
> I think that it's worth unifying them, not only to get rid of the duplication
> but mostly for consistency between all of those subnode names which are wildly
> differing for no real reason... and consistency is a long time issue with
> MediaTek bindings/dts in general (which is way way way better now, but still)...
>
> Besides - just for context and nothing else: the driver doesn't care about
> the names of the subnodes, anyway... so while this is technically an ABI break
> it's not really creating any functionality issue, and then, actually, Yassine
> is also modifying the devicetrees to comply with his consistency changes, so,
> in my own perspective, it's still acceptable.

Wait, I thought there were no users?

We generally only consider node names ABI when/if something or someone
cares. Most of the time it doesn't matter. For the pinctrl nodes, it's
really just a question of churn renaming a lot of nodes.

Ultimately, it's up to you. I only care that the implications of the
changes are clear in the commit msg.

Rob