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

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Date:   Thu, 16 Nov 2023 21:33:57 +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:     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

Am Donnerstag, 16. November 2023, 21:23:20 CET schrieb Krzysztof Kozlowski:
> On 16/11/2023 21:03, Heiko Stuebner wrote:
> 
> >>> 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.
> >>
> >> Good point. It is only a matter of style that this:
> >>
> >> foo {
> >> 	compatible = "foo";
> >> 	reg = <0x1>;
> >> 	clocks = <&clk>;
> >> 	wakeup-source;
> >> 	key-autorepeat;
> >> }
> >>
> >> looks better to me than:
> >>
> >>
> >> foo {
> >> 	compatible = "foo";
> >> 	reg = <0x1>;
> >> 	key-autorepeat;
> >> 	wakeup-source;
> >> 	clocks = <&clk>;
> >> }
> >>
> >> But you have good point that similar properties should be usually
> >> grouped together.
> >>
> >> About which regulator properties are you thinking now? You mean the
> >> supplies or the provider?
> > 
> > I was thinking about the provider. There are 
> > 	regulator-min-microvolt = <>;
> > and friends, but also
> > 	regulator-boot-on;
> 
> These are in regulator provider nodes and above guideline would keep
> logical order:
> 
> 	regulator-name = "vdd_kfc";
> 	regulator-min-microvolt = <800000>;
> 	regulator-max-microvolt = <1500000>;
> 	regulator-always-on;
> 	regulator-boot-on;
> 
> 	regulator-state-mem {
> 		regulator-off-in-suspend;
> 	};
> 
> What exactly would be here misordered?

going with the vcc5v0_host regulator of the rk3588-quartzpro64 and

+1. compatible
+2. reg
+3. ranges
+4. All properties with values
+5. Boolean properties
+6. status (if applicable)
+7. Child nodes

we'd end up with

        vcc5v0_host: vcc5v0-host-regulator {
/* 1. */        compatible = "regulator-fixed";
/* 4. */        gpio = <&gpio4 RK_PB0 GPIO_ACTIVE_HIGH>;
                pinctrl-names = "default";
                pinctrl-0 = <&vcc5v0_host_en>;
                regulator-min-microvolt = <5000000>;
                regulator-max-microvolt = <5000000>;
                regulator-name = "vcc5v0_host";
                vin-supply = <&vcc5v0_usb>;
/* 5. */        enable-active-high;
                regulator-always-on;
                regulator-boot-on;
        };      

which I find somewhat counter-intuitive ;-) .


Heiko