linux-kernel - Re: Aw: Re: [PATCH v1 1/2] dt-bindings: mmc: mtk-sd: update assigned-clocks/clock-parents for mt7986

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Message-ID: <b6ef76a8-95fc-aa76-d811-ed25ccb8ad8e@linaro.org>
Date:   Tue, 27 Jun 2023 15:37:09 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Frank Wunderlich <frank-w@...lic-files.de>
Cc:     Frank Wunderlich <linux@...web.de>,
        linux-mediatek@...ts.infradead.org,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Wenbin Mei <wenbin.mei@...iatek.com>,
        Sam Shih <sam.shih@...iatek.com>, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: Aw: Re: [PATCH v1 1/2] dt-bindings: mmc: mtk-sd: update
 assigned-clocks/clock-parents for mt7986

On 27/06/2023 14:09, Frank Wunderlich wrote:
>> Gesendet: Dienstag, 27. Juni 2023 um 12:44 Uhr
>> Von: "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>
>> Betreff: Re: [PATCH v1 1/2] dt-bindings: mmc: mtk-sd: update assigned-clocks/clock-parents for mt7986
>>
>> On 25/06/2023 21:11, Frank Wunderlich wrote:
>>> From: Frank Wunderlich <frank-w@...lic-files.de>
>>>
>>> MT7986 has 2 clock-parents so update the binding for it.
>>
>> You didn't test it, I think. If you do, then you will see errors from
>> other trees.
> 
> Hi,
> 
> i tested it of course...which errors do you see?

The top-level said it can be maximum 1, so raising it in allOf:if:then:
should not be enough

> 11
> this is basicly how i tested it (in case anything has changed):
> 
>         logfile=dtbs_arm64.log
>         exec 3> >(tee $logfile)
>         ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make DT_CHECKER_FLAGS=-m dt_binding_check 2>&3
>         if [[ $? -ne 0 ]];then echo "arm64 binding check failed!";cat $logfile;exit 1;fi
>         ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make defconfig #dtbs_check need kernel-config
>         ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make -j8 DT_CHECKER_FLAGS=-m dtbs_check 2>&3
>         if [[ $? -ne 0 ]];then echo "arm64 dtbs_check failed!";cat $logfile;exit 1;fi

A bit over-complicated... why not running dtbs_check against the schema
you changed?

> 
> and looked into the resulting logfile for keywords like mmc like mtk-sd
> 
> i tried running dtbs_check with passing the yaml-file, but of course all compatibles not matching this file were reported.
> 
> ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make -j6 DT_CHECKER_FLAGS=-m dtbs_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/mmc/mtk-sd.yaml
> 
> but this spits out many errors "failed to match any schema with compatible" because i defined only the changed one...
> 
> maybe there is another way to check only one yaml file against all dtbs without these unrelated errors.
> 
> pipeline in dt-bindings-patchwork is clean too
> https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20230625191151.7808-2-linux@fw-web.de/

Maybe that binding just fails to apply to DTS because of missing or not
correct compatibles.

> 
>> Anyway, I don't understand why defining it in the first place. Just drop
>> the assigned-clock* from the binding.
> 
> as it was defined (not looked where it was used) i only used the soc-specific branch to update the MaxItems...just to not break anything. After that the message i got before was fixed
> 
> arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dtb: mmc@...30000: assigned-clocks: [[4, 35], [4, 34]] is too long
> arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dtb: mmc@...30000: assigned-clock-parents: [[5, 6], [4, 18]] is too long
> 
> but if the right way is to drop the MaxItems from generic (or the property itself - where is it taken from then?). The only
> include i see is Documentation/devicetree/bindings/mmc/mmc-controller.yaml and there the assigned-clock* is not defined. And the

The way is to entirely drop assigned-clocks. I don't think there are
much benefits of having them in the bindings. Maybe if specific rates
are required, then yes - device cannot work with other rates and you can
verify it with dtbs_check. But otherwise it is like adding values of
'reg' or 'interrupts'. Plus some board might require third item and then
what?

Best regards,
Krzysztof