linux-kernel - Re: [PATCH] ARM: dts: imx6qdl: Enable egalax touch screen

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Date:   Fri, 13 Dec 2019 10:03:57 +0100
From:   Sjoerd Simons <sjoerd.simons@...labora.co.uk>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>
Subject: Re: [PATCH] ARM: dts: imx6qdl: Enable egalax touch screen

On Thu, 2019-12-12 at 17:25 +0100, Marco Felsch wrote:
> On 19-12-12 17:22, Sjoerd Simons wrote:
> > On Thu, 2019-12-12 at 17:07 +0100, Marco Felsch wrote:
> > > Hi Sjoerd,
> > > 
> > > On 19-12-12 17:02, Sjoerd Simons wrote:
> > > > Sabrelite boards can have an lvds screen attached with a built-
> > > > in
> > > > i2c touch
> > > > screen. Enable this in the dtsi.
> > > 
> > > Can this be any screen available on the market?
> > 
> > I guess i should have been more clear here; This is the touchscreen
> > in
> > the hannstar display (already part of the dts) that was sold as an
> > accessoiry to the sabrelite.
> 
> That is more clear =) Pls can you add this to the commit message?

Ofcourse will do; You also made me dig up the model number etc so i'll
include that information.

> > Same as the screen that can be used on the boundary nitrogen6
> > boards
> > (which do have the touch part already enabled in the dts)
> > 
> > > > Signed-off-by: Sjoerd Simons <sjoerd.simons@...labora.co.uk>
> > > > ---
> > > > 
> > > >  arch/arm/boot/dts/imx6qdl-sabrelite.dtsi | 8 ++++++++
> > > >  1 file changed, 8 insertions(+)
> > > > 
> > > > diff --git a/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
> > > > b/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
> > > > index 8468216dae9b..382b127b2251 100644
> > > > --- a/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
> > > > +++ b/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
> > > > @@ -416,6 +416,14 @@ &i2c3 {
> > > >  	pinctrl-names = "default";
> > > >  	pinctrl-0 = <&pinctrl_i2c3>;
> > > >  	status = "okay";
> > > > +
> > > > +	touchscreen@4 {
> > > > +		compatible = "eeti,egalax_ts";
> > > > +		reg = <0x04>;
> > > > +		interrupt-parent = <&gpio1>;
> > > > +		interrupts = <9 IRQ_TYPE_EDGE_FALLING>;
> > > > +		wakeup-gpios = <&gpio1 9 GPIO_ACTIVE_LOW>;
> > > 
> > > The wakeup-gpio and the irq-line are sharing the same gpio line?
> 
> Lastly should we add a own pinctrl entry for the touchscreen?

Would probably make sense to do that indeed; Will have a look

Thanks for the review!

-- 
Sjoerd Simons
Collabora Ltd.