linux-kernel - Re: [PATCH v3 4/7] arm64: dts: qcom: sc8280xp: add missing i2c nodes

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Date:   Fri, 23 Dec 2022 14:05:11 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Brian Masney <bmasney@...hat.com>, andersson@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, quic_shazhuss@...cinc.com,
        robh+dt@...nel.org, johan+linaro@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, ahalaney@...hat.com,
        echanude@...hat.com
Subject: Re: [PATCH v3 4/7] arm64: dts: qcom: sc8280xp: add missing i2c nodes

On Fri, Dec 23, 2022 at 01:42:32PM +0100, Konrad Dybcio wrote:
> On 23.12.2022 11:37, Johan Hovold wrote:
 
> >> +			i2c16: i2c@...000 {
> >> +				compatible = "qcom,geni-i2c";
> >> +				reg = <0 0x00880000 0 0x4000>;
> >> +				clocks = <&gcc GCC_QUPV3_WRAP2_S0_CLK>;
> >> +				clock-names = "se";
> >> +				interrupts = <GIC_SPI 373 IRQ_TYPE_LEVEL_HIGH>;
> >> +				#address-cells = <1>;
> >> +				#size-cells = <0>;
> > 
> > I'm aware that the two current i2c nodes has these two properties here
> > in the middle, but would you mind moving '#address-cells' and
> > '#size-cells' after 'reg' instead where I'd expect them to be?

> Hm.. we've been sticking them somewhere near the end for the longest
> time for every bus-like, or generally "i have childen" type node..
> I see it's a rather mixed bag in non-qcom SoCs, people just seem to
> put it wherever they please.. The dt spec doesn't seem to mention any
> preference fwiw.

The rationale for placing them under 'reg' is that you keep the
address-related properties together (e.g. 'reg', '#address-cells',
'#size-cells' and 'ranges').

Johan