linux-kernel - Re: [PATCH v2 3/3] arm64: dts: qcom: apq8016: Add Schneider HMIBSC board DTS

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Date: Thu, 14 Mar 2024 15:14:32 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sumit Garg <sumit.garg@...aro.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, linux-arm-msm@...r.kernel.org, 
	devicetree@...r.kernel.org, andersson@...nel.org, konrad.dybcio@...aro.org, 
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, 
	stephan@...hold.net, caleb.connolly@...aro.org, neil.armstrong@...aro.org, 
	laetitia.mariottini@...com, pascal.eberhard@...com, abdou.saker@...com, 
	jimmy.lalande@...com, benjamin.missey@....se.com, daniel.thompson@...aro.org, 
	linux-kernel@...r.kernel.org, Jagdish Gediya <jagdish.gediya@...aro.org>
Subject: Re: [PATCH v2 3/3] arm64: dts: qcom: apq8016: Add Schneider HMIBSC
 board DTS

On Thu, 14 Mar 2024 at 11:37, Sumit Garg <sumit.garg@...aro.org> wrote:
>
> On Thu, 14 Mar 2024 at 14:47, Sumit Garg <sumit.garg@...aro.org> wrote:
> >
> > On Thu, 14 Mar 2024 at 14:00, Krzysztof Kozlowski
> > <krzysztof.kozlowski@...aro.org> wrote:
> > >
> > > >>> +
> > > >>> +             compatible = "gpio-leds";
> > > >>> +             #address-cells = <1>;
> > > >>> +             #size-cells = <0>;
> > > >>
> > > >> That's not a bus.
> > > >>
> > > >> It does not look like you tested the DTS against bindings. Please run
> > > >> `make dtbs_check W=1` (see
> > > >> Documentation/devicetree/bindings/writing-schema.rst or
> > > >> https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/
> > > >> for instructions).
> > > >
> > > > I assumed earlier that W=1 is sufficient for DT schema checks but it
> > >
> > > W=1 as in make? No, it is not. It's flag changing the build process.
> > > dtbs_check is separate target.
> > >
> > > > looks like those are two different entities. However, I added these
> > > > address and size cells properties only to get rid of warnings reported
> > > > by W=1, see below:
> > > >
> > > > $ make qcom/apq8016-schneider-hmibsc.dtb W=1
> > > >   DTC     arch/arm64/boot/dts/qcom/apq8016-schneider-hmibsc.dtb
> > > > arch/arm64/boot/dts/qcom/apq8016-schneider-hmibsc.dts:96.9-103.5:
> > > > Warning (unit_address_vs_reg): /leds/led@5: node has a unit name, but
> > > > no reg or ranges property
> > > > arch/arm64/boot/dts/qcom/apq8016-schneider-hmibsc.dts:105.9-112.5:
> > > > Warning (unit_address_vs_reg): /leds/led@6: node has a unit name, but
> > > > no reg or ranges property
> > >
> > > Wait, so you saw the warnings and ignored them?
> >
> > Sorry but you are ignoring what I am trying to say.
> >
> > > These are legitimate
> > > warnings, although they don't give you full answer.
> > >
> > > > <snip>
> > > >
> > > > So it looks like W=1 is reporting false warnings and we should rather
> > >
> > > Warnings were true.
> > >
> >
> > That's was my initial impression too and I fixed them via following diff:
> >
> > diff --git a/arch/arm64/boot/dts/qcom/apq8016-schneider-hmibsc.dts
> > b/arch/arm64/boot/dts/qcom/apq8016-schneider-hmibsc.dts
> > index 8f9cacf8de89..a366d3aff3c5 100644
> > --- a/arch/arm64/boot/dts/qcom/apq8016-schneider-hmibsc.dts
> > +++ b/arch/arm64/boot/dts/qcom/apq8016-schneider-hmibsc.dts
> > @@ -92,8 +92,11 @@ leds {
> >                 pinctrl-0 = <&pm8916_mpps_leds>;
> >
> >                 compatible = "gpio-leds";
> > +               #address-cells = <1>;
> > +               #size-cells = <0>;
> >
> >                 led@5 {
> > +                       reg = <5>;
> >                         label = "apq8016-hmibsc:green:wlan";
> >                         function = LED_FUNCTION_WLAN;
> >                         color = <LED_COLOR_ID_YELLOW>;
> > @@ -103,6 +106,7 @@ led@5 {
> >                 };
> >
> >                 led@6 {
> > +                       reg = <6>;
> >                         label = "apq8016-hmibsc:yellow:bt";
> >                         function = LED_FUNCTION_BLUETOOTH;
> >                         color = <LED_COLOR_ID_BLUE>;
> >
> > But it then broke dtbs_check.
>
> See following breakage afterwards:
>
> $ make qcom/apq8016-schneider-hmibsc.dtb dtbs_check
> <snip>
> /home/sumit/build/upstream/linux/arch/arm64/boot/dts/qcom/apq8016-schneider-hmibsc.dtb:
> leds: led@5: Unevaluated properties are not allowed ('reg' was
> unexpected)
> from schema $id: http://devicetree.org/schemas/leds/leds-gpio.yaml#
> /home/sumit/build/upstream/linux/arch/arm64/boot/dts/qcom/apq8016-schneider-hmibsc.dtb:
> leds: led@6: Unevaluated properties are not allowed ('reg' was
> unexpected)
> from schema $id: http://devicetree.org/schemas/leds/leds-gpio.yaml#
> /home/sumit/build/upstream/linux/arch/arm64/boot/dts/qcom/apq8016-schneider-hmibsc.dtb:
> leds: '#address-cells', '#size-cells' do not match any of the regexes:
> '(^led-[0-9a-f]$|led)', 'pinctrl-[0-9]+'
> <snip>

That's because there is no addressing for gpio-leds. Just use names as
led-5, led-6.

>
> > Are you aware of any other saner way to
> > fix those warnings properly?
> >
>
> -Sumit
>


-- 
With best wishes
Dmitry