linux-kernel - Re: [PATCH v1 1/2] dt-bindings: arm: qcom,coresight-tpdm: Rename qcom,dsb-element-size

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Message-ID: <CAL_JsqL2aQw4zoLjvZq-M2_Sb8Q5KkAOcgfGOL2yf9ngixh3+A@mail.gmail.com>
Date: Wed, 14 Feb 2024 15:32:07 +0000
From: Rob Herring <robh@...nel.org>
To: Jinlong Mao <quic_jinlmao@...cinc.com>
Cc: James Clark <james.clark@....com>, Mike Leach <mike.leach@...aro.org>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Tao Zhang <quic_taozha@...cinc.com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, coresight@...ts.linaro.org, 
	linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] dt-bindings: arm: qcom,coresight-tpdm: Rename qcom,dsb-element-size

On Wed, Feb 14, 2024 at 8:18 AM Jinlong Mao <quic_jinlmao@...cinc.com> wrote:
>
>
> On 2/14/2024 5:36 PM, James Clark wrote:
> >
> > On 14/02/2024 01:43, Jinlong Mao wrote:
> >> On 2/14/2024 6:29 AM, Rob Herring wrote:
> >>> On Tue, Feb 13, 2024 at 08:05:17AM -0800, Mao Jinlong wrote:
> >>>> Change qcom,dsb-element-size to qcom,dsb-element-bits as the unit is
> >>>> bit.
> >>> That may be, but this is an ABI and you are stuck with it. Unless, you
> >>> can justify why that doesn't matter. (IIRC, this is new, so maybe no
> >>> users yet?)
> >> Hi Rob,
> >>
> >> Because for CMB type, it uses qcom,cmb-element-bits. So I change the
> >> format to be the same as
> >> CMB.
> >>
> >> Thanks
> >> Jinlong Mao
> >>
> > I think what Rob was trying to say was that in the interest of not
> > breaking existing DTs it's best to leave the existing names as they are,
> > even if they aren't technically correct. And to only add new parameters
> > with the -bits suffix, even if it's inconsistent with what's already there.
>
> Hi Rob & James,
>
> There is no tpdm nodes in any DT as of now. So I want to make this
> change before any tpdm
> node is added in DT.

Then the commit msg needs to state that detail.

Rob