linux-kernel - Re: [PATCH 2/7] dt-bindings: pwm: restrict node name suffixes

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Message-ID: <f141a538-23b8-d10e-227c-5f0ad191c3a6@linaro.org>
Date:   Wed, 7 Jun 2023 09:40:37 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Dipen Patel <dipenp@...dia.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Dilip Kota <eswara.kota@...ux.intel.com>,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org,
        linux-rtc@...r.kernel.org, alsa-devel@...a-project.org,
        linux-spi@...r.kernel.org, timestamp@...ts.linux.dev,
        linux-watchdog@...r.kernel.org, Rob Herring <robh@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>
Subject: Re: [PATCH 2/7] dt-bindings: pwm: restrict node name suffixes

On 07/06/2023 09:36, Uwe Kleine-König wrote:
> On Tue, May 30, 2023 at 04:48:46PM +0200, Krzysztof Kozlowski wrote:
>> Make the pattern matching node names a bit stricter to improve DTS
>> consistency.  The pattern is restricted to:
>> 1. Only one unit address or one -N suffix,
>> 2. -N suffixes to decimal numbers.
>>
>> Suggested-by: Rob Herring <robh@...nel.org>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
>>
>> ---
>>
>> Cc: Tony Lindgren <tony@...mide.com>
>> Cc: Oleksij Rempel <o.rempel@...gutronix.de>
>> ---
>>  Documentation/devicetree/bindings/pwm/pwm.yaml | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/pwm/pwm.yaml b/Documentation/devicetree/bindings/pwm/pwm.yaml
>> index 3c01f85029e5..abd9fa873354 100644
>> --- a/Documentation/devicetree/bindings/pwm/pwm.yaml
>> +++ b/Documentation/devicetree/bindings/pwm/pwm.yaml
>> @@ -13,7 +13,7 @@ select: false
>>  
>>  properties:
>>    $nodename:
>> -    pattern: "^pwm(@.*|-[0-9a-f])*$"
>> +    pattern: "^pwm(@.*|-([0-9]|[1-9][0-9]+))?$"
> 
> With this patch we forbid now the following patterns:
> 
> 	pwm-[0-9a-f][@-].*
> 	pwm-0[0-9a-f]+
> 	pwm-[a-f]([@-].*)?

Yes, this was discussed last time:
https://lore.kernel.org/all/20221127182232.GA128974-robh@kernel.org/

> 
> Checking for such names:
> 
> 	$ git grep -oP '\bpwm-([0-9a-f][@-].*|0[0-9a-f]+|[0-9]*[a-f][0-9a-f]*)(*pla:\s*\{)' arch/*/boot/dts
> 	arch/arm/boot/dts/meson8.dtsi:pwm-f-ao
> 	arch/arm/boot/dts/meson8.dtsi:pwm-e
> 	arch/arm/boot/dts/meson8b.dtsi:pwm-d
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-a
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-b-x7
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-b-x19
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-c-c
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-c-x5
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-c-x8
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-d-x3
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-d-x6
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-e
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-f-z
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-f-a
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-f-x
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-f-h
> 	arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi:pwm-a-e

Are you sure these are pwms, not pins?

> 
> These are all pinmux-settings and no pwm nodes, so the change is fine.
> (But arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi isn't properly
> sorted alphabetically.)

Exactly...

> 
> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>


Best regards,
Krzysztof