linux-kernel - Re: [PATCH v2] ARM: dts: imx: e60k02: Add touchscreen

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Date:   Mon, 7 Nov 2022 11:47:23 +0100
From:   Andreas Kemnade <andreas@...nade.info>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        alistair@...stair23.me
Subject: Re: [PATCH v2] ARM: dts: imx: e60k02: Add touchscreen

Hi,

On Mon, 7 Nov 2022 09:12:34 +0100
Marco Felsch <m.felsch@...gutronix.de> wrote:

> Hi Andreas,
> 
[...]
> > diff --git a/arch/arm/boot/dts/imx6sl-tolino-shine3.dts b/arch/arm/boot/dts/imx6sl-tolino-shine3.dts
> > index e3f1e8d79528..db5d8509935f 100644
> > --- a/arch/arm/boot/dts/imx6sl-tolino-shine3.dts
> > +++ b/arch/arm/boot/dts/imx6sl-tolino-shine3.dts
> > @@ -52,6 +52,13 @@ &iomuxc {
> >  	pinctrl-names = "default";
> >  	pinctrl-0 = <&pinctrl_hog>;
> >  
> > +	pinctrl_cyttsp5_gpio: cyttsp5-gpiogrp {
> > +		fsl,pins = <
> > +			MX6SL_PAD_SD1_DAT3__GPIO5_IO06                0x17059 /* TP_INT */
> > +			MX6SL_PAD_SD1_DAT2__GPIO5_IO13                0x10059 /* TP_RST */
> > +		>;
> > +	};  
> 
> Hm.. I don't like that you enable it within the base dtsi and add the
> missing dependencies here. I would rather add the touchscreen within the
> base dtsi but with with status set to disabled and without specifying
> the interrupt and reset gpio. Within the dts and the below you can
> reference the touchscreen via phandle and add the missing properties.
> 
hmm, that makes things more complex and unreadable. Remember, we have two boards
differ in a pin-compatible soc here. Why I should set something present
in all cases to disabled?
And why I should add hardware just to set to disabled?

I notice that I have not followed the agreed pattern for this things like in
the lm3630 setting, there we have


       pinctrl_lm3630a_bl_gpio: lm3630a-bl-gpiogrp {
                fsl,pins = <
                        MX6SLL_PAD_EPDC_PWR_CTRL3__GPIO2_IO10   0x10059 /* HWEN */
                >;
        };
[...]
&lm3630a {
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_lm3630a_bl_gpio>;
};

in the dts file, so there is no phandle pointing from dtsi to dts.
I will send an updated version following this widely adopted style.

Regards,
Andreas