linux-kernel - Re: [PATCH v1 4/4] ARM: dts: imx6dl: plym2m, prtvt7, victgo: make use of new resistive-adc-touch driver

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Message-ID: <20220105110434.GG303@pengutronix.de>
Date:   Wed, 5 Jan 2022 12:04:34 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, devicetree@...r.kernel.org,
        Fabio Estevam <festevam@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        David Jander <david@...tonic.nl>,
        Robin van der Gracht <robin@...tonic.nl>,
        dri-devel@...ts.freedesktop.org,
        Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH v1 4/4] ARM: dts: imx6dl: plym2m, prtvt7, victgo:  make
 use of new resistive-adc-touch driver

Hi Shawn,

sorry for the delay, I just came back to work.

On Mon, Dec 06, 2021 at 09:06:28AM +0800, Shawn Guo wrote:
> On Mon, Nov 22, 2021 at 01:43:10PM +0100, Oleksij Rempel wrote:
> > The tsc2046 is an ADC used as touchscreen controller. To share as mach
> > code as possible, we should use it as actual ADC + virtual tochscreen
> > controller.
> > With this patch we make use of the new kernel IIO and HID infrastructure.
> > 
> > Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> 
> One space is enough in subject "victgo:  make".

done.

> > ---
> >  arch/arm/boot/dts/imx6dl-plym2m.dts | 55 ++++++++++++++++++++---------
> >  arch/arm/boot/dts/imx6dl-prtvt7.dts | 53 ++++++++++++++++++++-------
> >  arch/arm/boot/dts/imx6dl-victgo.dts | 55 +++++++++++++++++++++--------
> >  3 files changed, 120 insertions(+), 43 deletions(-)
> > 
> > diff --git a/arch/arm/boot/dts/imx6dl-plym2m.dts b/arch/arm/boot/dts/imx6dl-plym2m.dts
> > index 60fe5f14666e..e2afedae85cb 100644
> > --- a/arch/arm/boot/dts/imx6dl-plym2m.dts
> > +++ b/arch/arm/boot/dts/imx6dl-plym2m.dts
> > @@ -101,6 +101,17 @@ reg_12v0: regulator-12v0 {
> >  		regulator-min-microvolt = <12000000>;
> >  		regulator-max-microvolt = <12000000>;
> >  	};
> > +
> > +	touchscreen {
> > +		compatible = "resistive-adc-touch";
> > +		io-channels = <&adc 1>, <&adc 3>, <&adc 4>, <&adc 5>;
> > +		io-channel-names = "y", "z1", "z2", "x";
> > +		touchscreen-min-pressure = <64687>;
> > +		touchscreen-inverted-x;
> > +		touchscreen-inverted-y;
> > +		touchscreen-x-plate-ohms = <300>;
> > +		touchscreen-y-plate-ohms = <800>;
> > +	};
> >  };
> >  
> >  &can1 {
> > @@ -129,26 +140,38 @@ &ecspi2 {
> >  	pinctrl-0 = <&pinctrl_ecspi2>;
> >  	status = "okay";
> >  
> > -	touchscreen@0 {
> > -		compatible = "ti,tsc2046";
> > +	adc: adc@0 {
> 
> Isn't label name "adc" too generic?

I do not have strong opinion about this. Currently we have no
restrictions for the node names:
Documentation/devicetree/bindings/iio/adc/ti,tsc2046.yaml
Documentation/devicetree/bindings/iio/adc/adc.yaml

I can name it touchscreen-adc@0 or something like this. What are your
preferences?

Regards,
Oleksij
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