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

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Message-ID: <79396eed-18ab-bcee-5c7e-c3e5e61f32c3@collabora.com>
Date:   Mon, 3 Apr 2023 16:43:36 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Cristian Ciocaltea <cristian.ciocaltea@...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

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.

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>;
>