linux-kernel - Re: [PATCH v2 5/6] arm: dts: amlogic: migrate pwms to new meson8 v2 binding

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Message-ID: <1jsf4xeskb.fsf@starbuckisacylon.baylibre.com>
Date:   Wed, 22 Nov 2023 15:52:56 +0100
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Jerome Brunet <jbrunet@...libre.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org, linux-pwm@...r.kernel.org,
        JunYi Zhao <junyi.zhao@...ogic.com>
Subject: Re: [PATCH v2 5/6] arm: dts: amlogic: migrate pwms to new meson8 v2
 binding


On Wed 22 Nov 2023 at 09:39, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> On 17/11/2023 13:59, Jerome Brunet wrote:
>> Update Amlogic based SoC PWMs to meson8-pwm-v2 compatible
>
> Why? Your commit msg must explain this. You break users of this DTS on
> older kernels and also this makes it impossible to apply via different
> branches in the same cycle. All this needs explanation and proper
> justification. Your message tells here nothing, because "what" is quite
> obvious.
>

I provided all the explanation possible through the different commits of
this series. I can re-state here if it helps

>> 
>> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
>> ---
>>  arch/arm/boot/dts/amlogic/meson.dtsi           |  4 ++--
>>  arch/arm/boot/dts/amlogic/meson8.dtsi          | 16 +++++++++++++---
>>  arch/arm/boot/dts/amlogic/meson8b-ec100.dts    |  2 --
>>  arch/arm/boot/dts/amlogic/meson8b-mxq.dts      |  2 --
>>  arch/arm/boot/dts/amlogic/meson8b-odroidc1.dts |  2 --
>>  arch/arm/boot/dts/amlogic/meson8b.dtsi         | 16 +++++++++++++---
>>  6 files changed, 28 insertions(+), 14 deletions(-)
>> 
>> diff --git a/arch/arm/boot/dts/amlogic/meson.dtsi b/arch/arm/boot/dts/amlogic/meson.dtsi
>> index 8e3860d5d916..80cc004ad5fe 100644
>> --- a/arch/arm/boot/dts/amlogic/meson.dtsi
>> +++ b/arch/arm/boot/dts/amlogic/meson.dtsi
>> @@ -83,14 +83,14 @@ i2c_A: i2c@...0 {
>>  			};
>>  
>>  			pwm_ab: pwm@...0 {
>> -				compatible = "amlogic,meson-pwm";
>> +				compatible = "amlogic,meson8-pwm-v2";
>
> That's breaking users of this DTS (old kernel, out of tree, other
> projects) for no real reasons without explanation.

"amlogic,meson-pwm" will continue to match, meaning of bindings is unchanged

How do you propose to fix badly designed bindings then ?

if we cant even introduce a new compatible to fix things up. It is supposed to
stay and broken till the end of time ?

>
> Best regards,
> Krzysztof