linux-kernel - Re: [PATCH v4 08/21] ARM: dts: imx7-colibri: Add touch controllers

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Message-ID: <155f9dc45253baca7766e52c89bba614d57ad807.camel@toradex.com>
Date:   Wed, 21 Aug 2019 12:51:30 +0000
From:   Philippe Schenker <philippe.schenker@...adex.com>
To:     "shawnguo@...nel.org" <shawnguo@...nel.org>
CC:     "stefan@...er.ch" <stefan@...er.ch>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "michal.vokac@...ft.com" <michal.vokac@...ft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        Max Krummenacher <max.krummenacher@...adex.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-imx@....com" <linux-imx@....com>
Subject: Re: [PATCH v4 08/21] ARM: dts: imx7-colibri: Add touch controllers

On Mon, 2019-08-19 at 13:21 +0200, Shawn Guo wrote:
> On Mon, Aug 12, 2019 at 02:21:26PM +0000, Philippe Schenker wrote:
> > Add touch controller that is connected over an I2C bus.
> > 
> > Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>
> > Acked-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
> > 
> > ---
> > 
> > Changes in v4:
> > - Add Marcel Ziswiler's Ack
> > 
> > Changes in v3:
> > - Fix commit message
> > 
> > Changes in v2:
> > - Deleted touchrevolution downstream stuff
> > - Use generic node name
> > - Better comment
> > 
> >  arch/arm/boot/dts/imx7-colibri-eval-v3.dtsi | 24
> > +++++++++++++++++++++
> >  1 file changed, 24 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/imx7-colibri-eval-v3.dtsi
> > b/arch/arm/boot/dts/imx7-colibri-eval-v3.dtsi
> > index d4dbc4fc1adf..576dec9ff81c 100644
> > --- a/arch/arm/boot/dts/imx7-colibri-eval-v3.dtsi
> > +++ b/arch/arm/boot/dts/imx7-colibri-eval-v3.dtsi
> > @@ -145,6 +145,21 @@
> >  &i2c4 {
> >  	status = "okay";
> >  
> > +	/*
> > +	 * Touchscreen is using SODIMM 28/30, also used for PWM<B>,
> > PWM<C>,
> > +	 * aka pwm2, pwm3. so if you enable touchscreen, disable the
> > pwms
> > +	 */
> > +	touchscreen@4a {
> > +		compatible = "atmel,maxtouch";
> > +		pinctrl-names = "default";
> > +		pinctrl-0 = <&pinctrl_gpiotouch>;
> > +		reg = <0x4a>;
> > +		interrupt-parent = <&gpio1>;
> > +		interrupts = <9 IRQ_TYPE_EDGE_FALLING>;		/*
> > SODIMM 28 */
> > +		reset-gpios = <&gpio1 10 GPIO_ACTIVE_HIGH>;	/* SODIMM 30
> > */
> > +		status = "disabled";
> 
> Why disabled?
> 
> Shawn

Also here, this is meant as an example to get our touchscreen faster
running. But those pins are primarily used as PWM's and they should by
default muxed for PWM's.
If a customer want's to add that touchscreen he just have to switch the
status of this and PWM...

Philippe

> 
> > +	};
> > +
> >  	/* M41T0M6 real time clock on carrier board */
> >  	rtc: m41t0m6@68 {
> >  		compatible = "st,m41t0";
> > @@ -200,3 +215,12 @@
> >  	vmmc-supply = <&reg_3v3>;
> >  	status = "okay";
> >  };
> > +
> > +&iomuxc {
> > +	pinctrl_gpiotouch: touchgpios {
> > +		fsl,pins = <
> > +			MX7D_PAD_GPIO1_IO09__GPIO1_IO9		0x74
> > +			MX7D_PAD_GPIO1_IO10__GPIO1_IO10		0x14
> > +		>;
> > +	};
> > +};
> > -- 
> > 2.22.0
> >