linux-kernel - Re: [PATCH v4 1/7] dt-bindings: clock: exynos850: Add bindings for Exynos850 sysreg clocks

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Date:   Tue, 21 Dec 2021 09:20:56 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Sam Protsenko <semen.protsenko@...aro.org>
Cc:     Sylwester Nawrocki <snawrocki@...nel.org>,
        Jaewon Kim <jaewon02.kim@...sung.com>,
        Chanho Park <chanho61.park@...sung.com>,
        David Virag <virag.david003@...il.com>,
        Youngmin Nam <youngmin.nam@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Daniel Palmer <daniel@...f.com>,
        Hao Fang <fanghao11@...wei.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v4 1/7] dt-bindings: clock: exynos850: Add bindings for
 Exynos850 sysreg clocks

On 21/12/2021 09:19, Krzysztof Kozlowski wrote:
> On 20/12/2021 15:55, Sam Protsenko wrote:
>> On Mon, 20 Dec 2021 at 11:31, Krzysztof Kozlowski
>> <krzysztof.kozlowski@...onical.com> wrote:
>>>
>>> On 19/12/2021 23:29, Sylwester Nawrocki wrote:
>>>> On 17.12.2021 17:15, Sam Protsenko wrote:
>>>>> System Register is used to configure system behavior, like USI protocol,
>>>>> etc. SYSREG clocks should be provided to corresponding syscon nodes, to
>>>>> make it possible to modify SYSREG registers.
>>>>>
>>>>> While at it, add also missing PMU and GPIO clocks, which looks necessary
>>>>> and might be needed for corresponding Exynos850 features soon.
>>>>>
>>>>> Reviewed-by: Krzysztof Kozlowski<krzysztof.kozlowski@...onical.com>
>>>>> Acked-by: Rob Herring<robh@...nel.org>
>>>>> Acked-by: Chanwoo Choi<cw00.choi@...sung.com>
>>>>> Signed-off-by: Sam Protsenko<semen.protsenko@...aro.org>
>>>>
>>>> Apologies for late reply, this patch is applied now.
>>>>
>>>
>>> Sam,
>>>
>>> The clock is used in the DTSI, so since this was applied, there are only
>>> two choices now:
>>> 1. wait for next cycle with DTSI and DTS,
>>> 2. Resubmit with replacing the newly added clocks in DTSI/DTS with
>>> numbers and a TODO note.
>>>
>>
>> But why? I thought because Sylwester applied my clock patches, those
>> will get into v5.17, and so DTSI/DTS might rely on those clocks? If I
>> get it wrong, please let me know why, and I'll go with item (2) you
>> suggested.
> 
> If I apply the DTSI+DTS, all my builds will start failing. The
> linux-next (since Sylwester's tree is included) should build fine, but
> my tree won't be buildable anymore. Then arm-soc pulls my tree and gets
> said because it does not build. Later, Linus will be unhappy if he pulls

s/said/sad/ obviously :)

> arm-soc (thus mine) before clock tree.
> 
> Other solution, instead of using raw numbers, is to copy-paste the clock
> macros you use directly in DTSI and do not include the clock header.
> This actually might be cleaner choice - changes will be limited to one
> place in DTSI.
> 
> Best regards,
> Krzysztof
> 


Best regards,
Krzysztof