linux-kernel - Re: [PATCH] ARM: dts: qcom-pma8084: fix vadc channel node names

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Message-ID: <2647127.mvXUDI8C0e@g550jk>
Date:   Mon, 26 Sep 2022 16:57:58 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     linux-arm-msm@...r.kernel.org, neil.armstrong@...aro.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: qcom-pma8084: fix vadc channel node names

Hi Neil,

On Montag, 26. September 2022 10:27:54 CEST Neil Armstrong wrote:
> On 25/09/2022 22:21, Luca Weiss wrote:
> > Node names for the channel are supposed to be adc-chan@....
> > 
> > Signed-off-by: Luca Weiss <luca@...tu.xyz>
> > ---
> > 
> >   arch/arm/boot/dts/qcom-pma8084.dtsi | 17 +++++++++++------
> >   1 file changed, 11 insertions(+), 6 deletions(-)
> > 
> > diff --git a/arch/arm/boot/dts/qcom-pma8084.dtsi
> > b/arch/arm/boot/dts/qcom-pma8084.dtsi index e77602e9f95c..7ad573c7b4ac
> > 100644
> > --- a/arch/arm/boot/dts/qcom-pma8084.dtsi
> > +++ b/arch/arm/boot/dts/qcom-pma8084.dtsi
> > @@ -64,22 +64,27 @@ pma8084_vadc: adc@...0 {
> > 
> >   			#size-cells = <0>;
> >   			#io-channel-cells = <1>;
> > 
> > -			die_temp {
> > +			adc-chan@8 {
> > 
> >   				reg = <VADC_DIE_TEMP>;
> >   			
> >   			};
> > 
> > -			ref_625mv {
> > +
> > +			adc-chan@9 {
> > 
> >   				reg = <VADC_REF_625MV>;
> >   			
> >   			};
> > 
> > -			ref_1250v {
> > +
> > +			adc-chan@10 {
> > 
> >   				reg = <VADC_REF_1250MV>;
> >   			
> >   			};
> > 
> > -			ref_buf_625mv {
> > +
> > +			adc-chan@12 {
> > 
> >   				reg = <VADC_SPARE1>;
> >   			
> >   			};
> > 
> > -			ref_gnd {
> > +
> > +			adc-chan@14 {
> > 
> >   				reg = <VADC_GND_REF>;
> >   			
> >   			};
> > 
> > -			ref_vdd {
> > +
> > +			adc-chan@15 {
> > 
> >   				reg = <VADC_VDD_VADC>;
> >   			
> >   			};
> >   		
> >   		};
> 
> I don't see where this is required, bindings doesn't mandate this naming:
> 
> patternProperties:
> 
>     "^.*@[0-9a-f]+$":

They don't require the "adc-chan" part (although dt nodes are supposed to have 
common names and adc-chan is used for adc for that; and dt node names are not 
supposed to have underscores), but this validation error happens without this 
commit:

<snip>/arch/arm/boot/dts/qcom-apq8084-ifc6540.dtb: pma8084@0: adc@...0: 
'oneOf' conditional failed, one must be fixed:
        '#address-cells', '#size-cells', 'die_temp', 'ref_1250v', 'ref_625mv', 
'ref_buf_625mv', 'ref_gnd', 'ref_vdd' do not match any of the regexes: 
'pinctrl-[0-9]+'
        'die_temp', 'ref_1250v', 'ref_625mv', 'ref_buf_625mv', 'ref_gnd', 
'ref_vdd' do not match any of the regexes: '^.*@[0-9a-f]+$', 'pinctrl-[0-9]+'
        'qcom,spmi-iadc' was expected
        From schema: <snip>/Documentation/devicetree/bindings/mfd/qcom,spmi-
pmic.yaml

So while e.g. ref-vdd@15 would also work, adc-chan@15 is more correct.

Regards
Luca


> Neil