linux-kernel - Re: [PATCH] ARM: dts: stm32: add focaltech touchscreen on stm32mp157c-dk2 board

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Date:   Thu, 3 Oct 2019 12:34:17 +0200
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Yannick Fertré <yannick.fertre@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Benjamin Gaignard <benjamin.gaignard@...com>,
        Philippe Cornu <philippe.cornu@...com>,
        Fabrice Gasnier <fabrice.gasnier@...com>
Subject: Re: [PATCH] ARM: dts: stm32: add focaltech touchscreen on
 stm32mp157c-dk2 board

Hi Yannick

On 9/30/19 4:45 PM, Yannick Fertré wrote:
> Enable focaltech ft6236 touchscreen on STM32MP157C-DK2 board.
> This device supports 2 different addresses (0x2a and 0x38)
> depending on the display  board version (MB1407).
> 
> Signed-off-by: Yannick Fertré <yannick.fertre@...com>
> ---
>   arch/arm/boot/dts/stm32mp157c-dk2.dts | 23 +++++++++++++++++++++++
>   1 file changed, 23 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/stm32mp157c-dk2.dts b/arch/arm/boot/dts/stm32mp157c-dk2.dts
> index 20ea601..527bb75 100644
> --- a/arch/arm/boot/dts/stm32mp157c-dk2.dts
> +++ b/arch/arm/boot/dts/stm32mp157c-dk2.dts
> @@ -61,6 +61,29 @@
>   	};
>   };
>   
> +&i2c1 {
> +	touchscreen@2a {
> +		compatible = "focaltech,ft6236";
> +		reg = <0x2a>;
> +		interrupts = <2 2>;
> +		interrupt-parent = <&gpiof>;
> +		interrupt-controller;
> +		touchscreen-size-x = <480>;
> +		touchscreen-size-y = <800>;
> +		status = "okay";
> +	};
> +	touchscreen@38 {
> +		compatible = "focaltech,ft6236";
> +		reg = <0x38>;
> +		interrupts = <2 2>;
> +		interrupt-parent = <&gpiof>;
> +		interrupt-controller;
> +		touchscreen-size-x = <480>;
> +		touchscreen-size-y = <800>;
> +		status = "okay";
> +	};
> +};

I'm not confident by this duplication. We should only support the latest 
revision of the MB1407. I understand the need but my fear is to 
duplicate this node each time we have a new revision (and imagine if we 
do that for all i2c devices).

regards
alex


>   &ltdc {
>   	status = "okay";
>   
>