linux-kernel - Re: [PATCH] docs: dt-bindings: add DTS Coding Style document

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Date:   Thu, 16 Nov 2023 20:26:41 +0100
From:   Heiko Stuebner <heiko@...ech.de>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Arnd Bergmann <arnd@...db.de>,
        Bjorn Andersson <andersson@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Michal Simek <michal.simek@....com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Nishanth Menon <nm@...com>, Olof Johansson <olof@...om.net>
Subject: Re: [PATCH] docs: dt-bindings: add DTS Coding Style document

Hi Krzysztof,
Am Donnerstag, 16. November 2023, 19:12:18 CET schrieb Krzysztof Kozlowski:
> Document preferred coding style for Devicetree sources (DTS and DTSI),
> to bring consistency among all (sub)architectures and ease in reviews.
> 
> Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Bjorn Andersson <andersson@...nel.org>
> Cc: Geert Uytterhoeven <geert+renesas@...der.be>
> Cc: Heiko Stuebner <heiko@...ech.de>
> Cc: Konrad Dybcio <konrad.dybcio@...aro.org>
> Cc: Matthias Brugger <matthias.bgg@...il.com>
> Cc: Michal Simek <michal.simek@....com>
> Cc: Neil Armstrong <neil.armstrong@...aro.org>
> Cc: Nishanth Menon <nm@...com>
> Cc: Olof Johansson <olof@...om.net>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 

> +Order of Properties in Device Node
> +----------------------------------
> +
> +Following order of properties in device nodes is preferred:
> +
> +1. compatible
> +2. reg
> +3. ranges
> +4. All properties with values
> +5. Boolean properties

I guess the only thing I do have questions about is the part

> +4. All properties with values
> +5. Boolean properties

Is there a rationale for it? Because with it things like regulator-*
properties then end up in two different blocks.


For all the rest I fully agree :-)


Thanks
Heiko


> +6. status (if applicable)
> +7. Child nodes
> +
> +The "status" property is by default "okay", thus it can be omitted.
> +
> +Example::
> +
> +	// SoC DTSI
> +
> +	usb_1_hsphy: phy@...3000 {
> +		compatible = "qcom,sm8550-snps-eusb2-phy";
> +		reg = <0x0 0x088e3000 0x0 0x154>;
> +		#phy-cells = <0>;
> +		resets = <&gcc GCC_QUSB2PHY_PRIM_BCR>;
> +		status = "disabled";
> +	};
> +
> +	// Board DTS
> +
> +	&usb_1_hsphy {
> +		clocks = <&tcsr TCSR_USB2_CLKREF_EN>;
> +		clock-names = "ref";
> +		status = "okay";
> +	};
> +