linux-kernel - Re: [PATCH 1/2] iio:adc:qcom-spmi-vadc: add default scale to LR_MUX2_BAT

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Date:   Sat, 16 Jan 2021 17:47:35 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Jonathan Albrieux <jonathan.albrieux@...il.com>,
        linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Andy Gross <agross@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-arm-msm@...r.kernel.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH 1/2] iio:adc:qcom-spmi-vadc: add default scale to
 LR_MUX2_BAT_ID channel

On Fri, 15 Jan 2021 10:30:49 -0600
Bjorn Andersson <bjorn.andersson@...aro.org> wrote:

> On Wed 13 Jan 09:18 CST 2021, Jonathan Albrieux wrote:
> 
> > Checking at both msm8909-pm8916.dtsi and msm8916.dtsi from downstream
> > it is indicated that "batt_id" channel has to be scaled with the default
> > function:
> > 
> > 	chan@31 {
> > 		label = "batt_id";
> > 		reg = <0x31>;
> > 		qcom,decimation = <0>;
> > 		qcom,pre-div-channel-scaling = <0>;
> > 		qcom,calibration-type = "ratiometric";
> > 		qcom,scale-function = <0>;
> > 		qcom,hw-settle-time = <0xb>;
> > 		qcom,fast-avg-setup = <0>;
> > 	};
> > 
> > Change LR_MUX2_BAT_ID scaling accordingly.
> >   
> 
> Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> 
> Not entirely sure, but looking at the history I think this used to work
> - but it's obvious that no one has read this channel for a while...
> 
> But I think below is a regression and should be mentioned:
> 
> Fixes: 7c271eea7b8a ("iio: adc: spmi-vadc: Changes to support different scaling")
> 

Yikes that was a while ago :)

> > Signed-off-by: Jonathan Albrieux <jonathan.albrieux@...il.com>  
> 
> Jonathan Cameron, if you merge this through your tree I can take the dts
> addition through the Qualcomm tree.

Applied to the fixes-togreg branch of iio.git and marked for stable.

I'm not going to rush this one given age of the bug, but if I happen to
have anything else going it'll make it before the end of this cycle.

Thanks,

Jonathan

> 
> Regards,
> Bjorn
> 
> > ---
> >  drivers/iio/adc/qcom-spmi-vadc.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/iio/adc/qcom-spmi-vadc.c b/drivers/iio/adc/qcom-spmi-vadc.c
> > index b0388f8a69f4..7e7d408452ec 100644
> > --- a/drivers/iio/adc/qcom-spmi-vadc.c
> > +++ b/drivers/iio/adc/qcom-spmi-vadc.c
> > @@ -598,7 +598,7 @@ static const struct vadc_channels vadc_chans[] = {
> >  	VADC_CHAN_NO_SCALE(P_MUX16_1_3, 1)
> >  
> >  	VADC_CHAN_NO_SCALE(LR_MUX1_BAT_THERM, 0)
> > -	VADC_CHAN_NO_SCALE(LR_MUX2_BAT_ID, 0)
> > +	VADC_CHAN_VOLT(LR_MUX2_BAT_ID, 0, SCALE_DEFAULT)
> >  	VADC_CHAN_NO_SCALE(LR_MUX3_XO_THERM, 0)
> >  	VADC_CHAN_NO_SCALE(LR_MUX4_AMUX_THM1, 0)
> >  	VADC_CHAN_NO_SCALE(LR_MUX5_AMUX_THM2, 0)
> > -- 
> > 2.17.1
> >