linux-kernel - Re: [PATCH v3 20/21] ARM: dts: imx6ull-colibri: Add touchscreen used with Eval Board

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Date:   Fri, 9 Aug 2019 15:54:53 +0000
From:   Marcel Ziswiler <marcel.ziswiler@...adex.com>
To:     Max Krummenacher <max.krummenacher@...adex.com>,
        "stefan@...er.ch" <stefan@...er.ch>,
        Philippe Schenker <philippe.schenker@...adex.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "michal.vokac@...ft.com" <michal.vokac@...ft.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "festevam@...il.com" <festevam@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-imx@....com" <linux-imx@....com>
Subject: Re: [PATCH v3 20/21] ARM: dts: imx6ull-colibri: Add touchscreen used
 with Eval Board

Hi Philippe

On Wed, 2019-08-07 at 08:26 +0000, Philippe Schenker wrote:
> This adds the common touchscreen that is used with Toradex's
> Eval Boards.

Is that really Eval Board specific?

> Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>
> 
> ---
> 
> Changes in v3: None
> Changes in v2:
> - Removed f0710a, that is downstream only
> - Changed to generic node name
> - Better comment
> 
>  .../arm/boot/dts/imx6ull-colibri-eval-v3.dtsi | 24
> +++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/imx6ull-colibri-eval-v3.dtsi
> b/arch/arm/boot/dts/imx6ull-colibri-eval-v3.dtsi
> index d3c4809f140e..78e74bfeca1b 100644
> --- a/arch/arm/boot/dts/imx6ull-colibri-eval-v3.dtsi
> +++ b/arch/arm/boot/dts/imx6ull-colibri-eval-v3.dtsi
> @@ -112,6 +112,21 @@
>  &i2c1 {
>  	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 = <&gpio4>;
> +		interrupts = <16 IRQ_TYPE_EDGE_FALLING>;	/* SODIMM 28
> */
> +		reset-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>;	/*
> SODIMM 30 */
> +		status = "disabled";
> +	};
> +
>  	/* M41T0M6 real time clock on carrier board */
>  	m41t0m6: rtc@68 {
>  		compatible = "st,m41t0";
> @@ -188,3 +203,12 @@
>  	sd-uhs-sdr104;
>  	status = "okay";
>  };
> +
> +&iomuxc {
> +	pinctrl_gpiotouch: touchgpios {
> +		fsl,pins = <
> +			MX6UL_PAD_NAND_DQS__GPIO4_IO16		0x74
> +			MX6UL_PAD_ENET1_TX_EN__GPIO2_IO05	0x14
> +		>;
> +	};
> +};

I guess that could also be moved to the module's dtsi for any carrier board to potentially profit from.

Cheers

Marcel