linux-kernel - Re: [PATCH v9 1/7] dt-bindings: spmi: Add X1E80100 SPMI PMIC ARB schema

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Date: Mon, 8 Apr 2024 09:04:55 +0300
From: Abel Vesa <abel.vesa@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: Stephen Boyd <sboyd@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Srini Kandagatla <srinivas.kandagatla@...aro.org>,
	Johan Hovold <johan@...nel.org>,
	David Collins <quic_collinsd@...cinc.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org, linux-mediatek@...ts.infradead.org,
	devicetree@...r.kernel.org,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v9 1/7] dt-bindings: spmi: Add X1E80100 SPMI PMIC ARB
 schema

On 24-04-07 19:07:03, Bjorn Andersson wrote:
> On Sun, Apr 07, 2024 at 07:23:21PM +0300, Abel Vesa wrote:
> > Add dedicated schema for X1E80100 PMIC ARB (v7) as it allows multiple
> > buses by declaring them as child nodes.
> > 
> 
> But is this really a "dedicated schema for X1E80100"? Isn't it "the
> schema for all multi-bus controllers"?
> 
> I.e. isn't this a "dedicated schema for all platforms starting with
> SM8450"?

Suggestion was from Krzysztof to add platform specific comaptible (and
therefore schema). Since the first platform that will support in
upstream proper multi bus is the x1e80100, the schema needs to bear the
same name as the compatible. When support for multi bus will be added to
the other platforms (including the SM8450), they will use the fallback
compatible of the x1e80100 and will be documented in this newly added
schema. We did the same thing with some PHYs drivers, IIRC.

> 
> Can you please use the commit message to document the actual reason why
> you choose to create a dedicated schema for this? Is it simply to avoid
> having to schema with either pmics or multiple buses as children?

I can re-send the patchset with such a phrase in commit message.

One of the early versions of this patchset was actually submitting a
generic compatible for multi bus, but I remember that there was a
request for following the platform dedicated approach.

Krzysztof, can you please provide here the argument for why that is
preferred?

> 
> Regards,
> Bjorn