linux-kernel - Re: [EXT] Re: [PATCH v4 2/2] dt-bindings: media: imx-jpeg: Assign slot for imx jpeg encoder/decoder

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Message-ID: <20230927-dismantle-retinal-2f5dc8c6c235@wendy>
Date:   Wed, 27 Sep 2023 10:11:42 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC:     Ming Qian <ming.qian@....com>, Conor Dooley <conor@...nel.org>,
        "Mirela Rabulea (OSS)" <mirela.rabulea@....nxp.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "X.H. Bao" <xiahong.bao@....com>, Eagle Zhou <eagle.zhou@....com>,
        Tao Jiang <tao.jiang_2@....com>,
        dl-linux-imx <linux-imx@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [EXT] Re: [PATCH v4 2/2] dt-bindings: media: imx-jpeg: Assign
 slot for imx jpeg encoder/decoder

On Wed, Sep 27, 2023 at 10:10:40AM +0200, Krzysztof Kozlowski wrote:
> On 27/09/2023 04:10, Ming Qian wrote:
> >> From: Conor Dooley <conor@...nel.org>
> >> Sent: 2023年9月26日 21:26
> >> To: Ming Qian <ming.qian@....com>
> >> Cc: Mirela Rabulea (OSS) <mirela.rabulea@....nxp.com>;
> >> robh+dt@...nel.org; shawnguo@...nel.org;
> >> krzysztof.kozlowski+dt@...aro.org; conor+dt@...nel.org;
> >> mchehab@...nel.org; hverkuil-cisco@...all.nl; s.hauer@...gutronix.de;
> >> kernel@...gutronix.de; festevam@...il.com; X.H. Bao
> >> <xiahong.bao@....com>; Eagle Zhou <eagle.zhou@....com>; Tao Jiang
> >> <tao.jiang_2@....com>; dl-linux-imx <linux-imx@....com>;
> >> devicetree@...r.kernel.org; linux-media@...r.kernel.org; linux-
> >> kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> >> Subject: [EXT] Re: [PATCH v4 2/2] dt-bindings: media: imx-jpeg: Assign slot for
> >> imx jpeg encoder/decoder
> >>
> >> Hi,
> >>
> >> On Tue, Sep 26, 2023 at 06:10:00PM +0800, Ming Qian wrote:
> >>> There are total 4 slots available in the IP, and we only need to use
> >>> one slot in one os, assign a single slot, configure interrupt and
> >>> power domain only for 1 slot, not for the all 4 slots.
> >>>
> >>> Signed-off-by: Ming Qian <ming.qian@....com>
> >>> ---
> >>> v4
> >>> - improve commit message
> >>
> >>> - don't make an ABI break
> >>
> >> What does this mean? Can you please try to explain things a bit more clearly
> >> in your changelogs?
> >>
> >> Also, where is the code that actually makes use of these properties?
> > 
> > In v3 patch, I make this property required, make it an ABI break, so in v4, I remove it from required, and default to the previous behavior if it is missing.
> 
> So say that you dropped line making the property required.
> 
> > 
> > The code patch is sent before, but the dts change is not applicable, so I send it separately. The code patch link is as below:
> > https://patchwork.linuxtv.org/project/linux-media/patch/cdadb4a23697fdc97def958c69b12cd00f547212.1685430841.git.ming.qian@nxp.com/
> > 
> > But in the patch, the property name is "slot", not "nxp,slot", I will make another patch to fix the property name after this patch is reviewed.
> 
> Format your emails properly. It's difficult to read it.
> 
> I already NAKed it, I will be NAKing still. Don't embed OS specific into
> the bindings nor into the DTS.

Additionally, sending the binding and dts patch split out from the
proposed driver change is very unhelpful, as often (as is the case here)
binding patches are not very well explained and it is required to read
the driver to reverse-engineer the binding patch author's real intent.

Particularly when you mention an ABI break it is important to do so, so
that we can check the code changes to make sure that the ABI is upheld.

Thanks,
Conor.

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