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

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Date:   Wed, 7 Jun 2023 09:36:52 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
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 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]([@-].*)?

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

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.)

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

Best regards and Thanks
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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