linux-kernel - Re: [PATCH 1/2] ARM: dts: qcom: Add LPG node to pm8941

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Date:   Mon, 16 May 2022 22:09:47 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...ainline.org>
Subject: Re: [PATCH 1/2] ARM: dts: qcom: Add LPG node to pm8941

Hi Bjorn,

On Freitag, 6. Mai 2022 05:49:34 CEST Bjorn Andersson wrote:
> On Thu 05 May 03:01 CDT 2022, Luca Weiss wrote:
> > Hi Bjorn,
> > 
> > On Mittwoch, 4. Mai 2022 22:54:10 CEST Bjorn Andersson wrote:
> > > The PM8941 contains 8 LPG channels, as well as TRILED and LUT blocks.
> > > Add a node for these.
> > > 
> > > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > > ---
> > > 
> > >  arch/arm/boot/dts/qcom-pm8941.dtsi | 9 +++++++++
> > >  1 file changed, 9 insertions(+)
> > > 
> > > diff --git a/arch/arm/boot/dts/qcom-pm8941.dtsi
> > > b/arch/arm/boot/dts/qcom-pm8941.dtsi index cdd2bdb77b32..7881a071b372
> > > 100644
> > > --- a/arch/arm/boot/dts/qcom-pm8941.dtsi
> > > +++ b/arch/arm/boot/dts/qcom-pm8941.dtsi
> > > @@ -144,6 +144,15 @@ pm8941_1: pm8941@1 {
> > > 
> > >  		#address-cells = <1>;
> > >  		#size-cells = <0>;
> > > 
> > > +		pm8941_lpg: lpg {
> > > +			compatible = "qcom,pm8941-lpg";
> > > +
> > > +			#address-cells = <1>;
> > > +			#size-cells = <0>;
> > 
> > Just curious, why doesn't pm8941 have #pwm-cells = <2>; like the other lpg
> > nodes in [0]?
> 
> I guess I didn't have a need for the lpg to be a pwm-chip on this pmic,
> yet. This could be added now, or at a later point when someone has a
> usecase for the pwm-chip.

While I don't know the use case for using the lpg as pwm on consumer hardware, 
it's maybe a good idea to add now?

> 
> > Other than that, the node works fine on pm8941. Will send a patch for
> > enabling notification LED on msm8974-FP2 soon.
> 
> If you turn that into a Tested-by, and preferably a Reviewed-by, I would
> have what I need to merge the two changes.

In any case:

Tested-by: Luca Weiss <luca@...tu.xyz>
Reviewed-by: Luca Weiss <luca@...tu.xyz>

Regards
Luca

> 
> Looking forward to the FP2 patch.
> 
> Thanks,
> Bjorn
> 
> > Regards
> > Luca
> > 
> > [0]
> > https://lore.kernel.org/linux-arm-msm/20220505022706.1692554-2-bjorn.ande
> > rsson@...aro.org/> 
> > > +
> > > +			status = "disabled";
> > > +		};
> > > +
> > > 
> > >  		pm8941_wled: wled@...0 {
> > >  		
> > >  			compatible = "qcom,pm8941-wled";
> > >  			reg = <0xd800>;