linux-kernel - Re: [PATCH 1/2] dt-bindings: hwmon: pwm-fan: Convert to DT schema

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Message-ID: <49c226ff-08a3-a7ca-59bd-f0b9cea865e3@collabora.com>
Date:   Mon, 3 Apr 2023 19:22:45 +0300
From:   Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Rob Herring <robh@...nel.org>
Cc:     kernel@...labora.com, linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>, linux-hwmon@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        Jean Delvare <jdelvare@...e.com>,
        Heiko Stuebner <heiko@...ech.de>, linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Subject: Re: [PATCH 1/2] dt-bindings: hwmon: pwm-fan: Convert to DT schema

On 4/3/23 17:43, AngeloGioacchino Del Regno wrote:
> Il 03/04/23 16:32, Cristian Ciocaltea ha scritto:
>> On 4/3/23 16:10, Rob Herring wrote:
>>>
>>> On Mon, 03 Apr 2023 13:50:51 +0300, Cristian Ciocaltea wrote:
>>>> Convert the PWM fan bindings to DT schema format.
>>>>
>>>> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
>>>> ---
>>>>    .../devicetree/bindings/hwmon/pwm-fan.txt     |  68 +----------
>>>>    .../devicetree/bindings/hwmon/pwm-fan.yaml    | 109
>>>> ++++++++++++++++++
>>>>    2 files changed, 110 insertions(+), 67 deletions(-)
>>>>    create mode 100644
>>>> Documentation/devicetree/bindings/hwmon/pwm-fan.yaml
>>>>
>>>
>>> Running 'make dtbs_check' with the schema in this patch gives the
>>> following warnings. Consider if they are expected or the schema is
>>> incorrect. These may not be new warnings.
>>>
>>> Note that it is not yet a requirement to have 0 warnings for dtbs_check.
>>> This will change in the future.
>>>
>>> Full log is available here:
>>> https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20230403105052.426135-2-cristian.ciocaltea@collabora.com
>>>
>>>
>>> pwm-fan: 'cooling-max-state', 'cooling-min-state' do not match any of
>>> the regexes: 'pinctrl-[0-9]+'
>>>     arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dtb
>>>     arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28-var3-ads2.dtb
>>>
>>
>> The only references to the offending cooling-{min|max}-state are located
>> in a few DTS files. Assuming they are obsolete, may I simply drop them?
>>
> 
> If they're obsolete, you can mark them as `deprecated: true` in the
> binding, but
> dropping them entirely would be an ABI breakage, so no, you can't.

>From the pwm-fan driver point of view, the properties are not supported
and I couldn't find any indication that they could have been used in the
past.

Hence I'm not sure adding them to the binding is the proper way to
handle this issue.

Thanks,
Cristian

> Regards,
> Angelo
> 
>> $ git grep "cooling-.*-state"
>>
>> arch/arm64/boot/dts/amlogic/meson-g12b-bananapi.dtsi:
>> cooling-min-state = <0>;
>> arch/arm64/boot/dts/amlogic/meson-g12b-bananapi.dtsi:
>> cooling-max-state = <3>;
>> arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dts:
>> cooling-min-state = <0>;
>> arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dts:
>> cooling-max-state = <3>;
>> arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28-var3-ads2.dts:        cooling-min-state = <0>;
>> arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28-var3-ads2.dts:        cooling-max-state = <3>;
>> arch/arm64/boot/dts/freescale/fsl-lx2160a-cex7.dtsi:       
>> cooling-min-state = <0>;
>> arch/arm64/boot/dts/freescale/fsl-lx2160a-cex7.dtsi:       
>> cooling-max-state = <9>;
>>
> 
> 
>