linux-kernel - Re: [PATCH 10/11] ARM: dts: qcom: Update devicetree for QCOM ADC bindings path change

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Date:   Thu, 16 Nov 2023 08:55:04 +0530
From:   Jishnu Prakash <quic_jprakash@...cinc.com>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <agross@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linus.walleij@...aro.org>,
        <Jonathan.Cameron@...wei.com>, <sboyd@...nel.org>,
        <dmitry.baryshkov@...aro.org>, <quic_subbaram@...cinc.com>,
        <quic_collinsd@...cinc.com>, <quic_kamalw@...cinc.com>,
        <marijn.suijten@...ainline.org>,
        <andriy.shevchenko@...ux.intel.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <cros-qcom-dts-watchers@...omium.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-iio@...r.kernel.org>,
        <linux-arm-msm-owner@...r.kernel.org>
Subject: Re: [PATCH 10/11] ARM: dts: qcom: Update devicetree for QCOM ADC
 bindings path change

Hi Bjorn,

On 11/11/2023 5:17 AM, Bjorn Andersson wrote:
> On Mon, Oct 23, 2023 at 11:48:13AM +0530, Jishnu Prakash wrote:
>> Hi Krzysztof,
>>
>> On 7/9/2023 10:56 PM, Krzysztof Kozlowski wrote:
>>> On 08/07/2023 09:28, Jishnu Prakash wrote:
>>>> Update ADC dt-bindings file paths in QCOM devicetree files to
>>>> match the dt-bindings change moving the files from 'iio' to
>>>> 'iio/adc' folder.
>>>>
>>>> Signed-off-by: Jishnu Prakash<quic_jprakash@...cinc.com>
>>>> ---
>>> Your order of patches is incorrect. DTS cannot be before bindings,
>>> because this indicates you broke ABI. Please keep entire patchset
>>> bisectable and split DTS to separate patchset (linking the driver and
>>> bindings).
>>>
>>> Best regards,
>>> Krzysztof
>> OK....so you mean I can move the dtbinding files and update documentation
>> and driver files for this, all in one patch and then make a second patch for
>> updating devicetree files for the file paths?
>>
>> I'll make this change in the next patchset if it looks fine, although the
>> two patches would need to be picked together to avoid kernel breakage. I
>> have asked Jonathan about this too in my reply for the previous patchset 9.
>>
> 1) We need to be able to use git bisect to identify regressions, and as
> such the kernel need to be buildable and functional after each applied
> patch.
>
> 2) DeviceTree source (dts) changes enters the kernel through different
> maintainer paths than the DeviceTree binding and driver changes, and
> therefore at different times. In some cases the .dtb file is also
> delivered separately from the kernel, which means people might be
> running an old .dtb for a considerable amount of time after your change.
> As such your driver changes needs to be compatible with both the new and
> the old DeviceTree binding.


Thanks for your comments. For now, Jonathan and Dmitry have asked me to 
move the binding files and fix all errors in one commit for their 
review, so I'll be doing as they requested. Based on their review, I'm 
assuming they will also suggest what other changes are needed for 
compatibility with older devicetrees as you mentioned.


> Regards,
> Bjorn