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

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Date:   Fri, 15 Jan 2021 10:30:49 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Jonathan Albrieux <jonathan.albrieux@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Andy Gross <agross@...nel.org>,
        Jonathan Cameron <jic23@...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 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")

> 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.

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
>