[PATCH 0/2] Allow VADC_LR_MUX2_BAT_ID channel proper reading

[PATCH 0/2] Allow VADC_LR_MUX2_BAT_ID channel proper reading

[Jonathan Albrieux]

Working on a battery charger and fuel gauge driver it happened to
have the need to read from VADC_LR_MUX2_BAT_ID channel. Here is
the declaration from downstream msm8916.dtsi:

	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>;
	};

Those two patches set channel scaling accordingly and add it to
pm8916 device tree.

Jonathan Albrieux (2):
  iio:adc:qcom-spmi-vadc: add default scale to LR_MUX2_BAT_ID channel
  arm64: dts: qcom: pm8916: Add batt_id channel node

 arch/arm64/boot/dts/qcom/pm8916.dtsi | 5 +++++
 drivers/iio/adc/qcom-spmi-vadc.c     | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

-- 
2.17.1

[PATCH 1/2] iio:adc:qcom-spmi-vadc: add default scale to LR_MUX2_BAT_ID channel

[Jonathan Albrieux]

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.

Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
---
 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

[PATCH 2/2] arm64: dts: qcom: pm8916: Add batt_id channel node

[Jonathan Albrieux]

Working on a battery charger and fuel gauge driver it happened to
have the need to read from VADC_LR_MUX2_BAT_ID channel. Here is
the declaration from downstream msm8916.dtsi:

	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>;
	};

Add VADC_LR_MUX2_BAT_ID accordingly.

Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
---
 arch/arm64/boot/dts/qcom/pm8916.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/pm8916.dtsi b/arch/arm64/boot/dts/qcom/pm8916.dtsi
index a7663bf867ec..854e51883289 100644
--- a/arch/arm64/boot/dts/qcom/pm8916.dtsi
+++ b/arch/arm64/boot/dts/qcom/pm8916.dtsi
@@ -95,6 +95,11 @@
 			adc-chan@f {
 				reg = <VADC_VDD_VADC>;
 			};
+			adc-chan@g {
+				reg = <VADC_LR_MUX2_BAT_ID>;
+				qcom,hw-settle-time = <2000>;
+				qcom,ratiometric;
+			};
 		};
 
 		rtc@6000 {
-- 
2.17.1

Re: [PATCH 1/2] iio:adc:qcom-spmi-vadc: add default scale to LR_MUX2_BAT_ID channel

[Bjorn Andersson]

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@linaro.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@gmail.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
> 

Re: [PATCH 1/2] iio:adc:qcom-spmi-vadc: add default scale to LR_MUX2_BAT_ID channel

[Jonathan Cameron]

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

Re: [PATCH 1/2] iio:adc:qcom-spmi-vadc: add default scale to LR_MUX2_BAT_ID channel

[Jonathan Albrieux]

On Sat, Jan 16, 2021 at 05:47:35PM +0000, Jonathan Cameron wrote:
> On Fri, 15 Jan 2021 10:30:49 -0600
> Bjorn Andersson <bjorn.andersson@linaro.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@linaro.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@gmail.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
> > >   
> 
Thank you Bjorn, thank you Jonathan,

Regards,

Jonathan