Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Message-ID: <794f39ed-3436-432c-767d-8fa60779d510@canonical.com>
Date:   Tue, 18 Jan 2022 08:52:33 +0100
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
 Thunderbird/91.3.1
Subject: Re: [PATCH v2 24/28] dt-bindings: pinctrl: samsung: convert to
 dtschema
Content-Language: en-US
To:     Olof Johansson <olof@lixom.net>
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Tomasz Figa <tomasz.figa@gmail.com>,
        Sylwester Nawrocki <s.nawrocki@samsung.com>,
        Rob Herring <robh+dt@kernel.org>,
        Linux ARM Mailing List <linux-arm-kernel@lists.infradead.org>,
        "moderated list:ARM/SAMSUNG EXYNOS ARM ARCHITECTURES" 
        <linux-samsung-soc@vger.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        DTML <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Sam Protsenko <semen.protsenko@linaro.org>,
        Chanho Park <chanho61.park@samsung.com>,
        Alim Akhtar <alim.akhtar@gmail.com>,
        Rob Herring <robh@kernel.org>
References: <20220111201426.326777-1-krzysztof.kozlowski@canonical.com>
 <20220111201722.327219-18-krzysztof.kozlowski@canonical.com>
 <CACRpkdYTXSOW+sOX3wVtF4jj6xm0jr-F3HKQPGHOdAVjbasP3A@mail.gmail.com>
 <5047da7c-d3a6-5472-b0ca-7ed3dbe8a5fe@canonical.com>
 <CACRpkdbhmJ91EW395C5F2WYjWJQdJ-SBHaDm7XnQsxMuyoMmLg@mail.gmail.com>
 <77bd8fa4-2b35-352c-da07-ef91fcbed454@canonical.com>
 <CAOesGMg2eH1B94h+etPBDW3B1LMeHBytz0v2e0GfVRDv8gU0YA@mail.gmail.com>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
In-Reply-To: <CAOesGMg2eH1B94h+etPBDW3B1LMeHBytz0v2e0GfVRDv8gU0YA@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 17/01/2022 21:26, Olof Johansson wrote:
> On Sun, Jan 16, 2022 at 11:45 PM Krzysztof Kozlowski
> <krzysztof.kozlowski@canonical.com> wrote:
>>
>> On 16/01/2022 22:38, Linus Walleij wrote:
>>> On Sun, Jan 16, 2022 at 6:10 PM Krzysztof Kozlowski
>>> <krzysztof.kozlowski@canonical.com> wrote:
>>>
>>>> Anyway DTS and dtschema will have to wait for one release, because they
>>>> depend on samsung pinctrl driver change (patch #2).
>>>
>>> What about I put that (and maybe this schema) on an immutable
>>> branch so you can pull the commit into your for-arm-soc branch and
>>> put the DTS changes on top?
>>
>> That would be a solution if not a policy for arm-soc of keeping DTS
>> separate. Arnd and Olof since some time are not happy when DTS branch
>> receives any driver updates.
>>
>> Arnd, Olof,
>> This is a set of dtschema conversion + DTS alignment with new schema:
>> 1. Driver change necessary to accept new DTS (driver depends on node
>> names and this has to change because of dtschema),
>> 2. DTS commits depending on above, which convert node name to new format,
>> 3. Finally dtschema requiring new naming of the GPIO nodes.
>>
>> If I got correctly, the policy of not mixing drivers and DTS requires
>> that #2 above (DTS changes) will wait for one more release. During the
>> time, if dtschema (#3 above) is applied, there will be new warnings
>> about non-compliant DTS.
>>
>> Do you see any chance of merging driver + DTS + dtschema via same tree
>> in same release?
> 
> Our general guidance to separate DTS and driver changes is to avoid
> large entangled changes between the two, and to discourage a developer
> mentality of "the implementation is the binding".
> 
> I think this is a good example of when it makes sense to bring in what
> is a fairly small and clean driver change to deal with this. So the
> right answer here is to stage such a stable branch and merge into both
> arm-soc and the pinctrl subsystem trees as proposed.

Thanks for clarification, I'll go with this approach.

Best regards,
Krzysztof