linux-kernel - Re: [PATCH v4 2/3] input: Add DT binding documentation for Colibri VF50 touchscreen

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Message-ID: <24b47f359d019e8871887777372b442b@agner.ch>
Date:	Sat, 22 Aug 2015 18:36:54 -0700
From:	Stefan Agner <stefan@...er.ch>
To:	Sanchayan Maity <maitysanchayan@...il.com>
Cc:	dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
	devicetree@...r.kernel.org, shawnguo@...nel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 2/3] input: Add DT binding documentation for Colibri
 VF50 touchscreen

On 2015-08-21 06:26, Sanchayan Maity wrote:
> This adds device tree binding documentation for the Colibri VF50
> touchscreen driver.
> 
> Signed-off-by: Sanchayan Maity <maitysanchayan@...il.com>
> ---
>  .../bindings/input/touchscreen/colibri-vf50-ts.txt | 36 ++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/input/touchscreen/colibri-vf50-ts.txt
> 
> diff --git
> a/Documentation/devicetree/bindings/input/touchscreen/colibri-vf50-ts.txt
> b/Documentation/devicetree/bindings/input/touchscreen/colibri-vf50-ts.txt
> new file mode 100644
> index 0000000..e615aa9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/colibri-vf50-ts.txt
> @@ -0,0 +1,36 @@
> +* Toradex Colibri VF50 Touchscreen driver
> +
> +Required Properties:
> +- compatible must be toradex,vf50-touchscreen
> +- io-channels: adc channels being used by the Colibri VF50 module
> +- xp-gpios: FET gate driver for input of X+
> +- xm-gpios: FET gate driver for input of X-
> +- yp-gpios: FET gate driver for input of Y+
> +- ym-gpios: FET gate driver for input of Y-
> +- interrupt-parent: phandle for the interrupt controller
> +- interrupts: pen irq interrupt for touch detection

I like the use of the interrupt interface for the touch detection pin.
Maybe you can mention here that this is (typically) a GPIO...

> +- pinctrl-names: "idle", "default", "gpios"
> +- pinctrl-0: pinctrl node for idle state gpio pinmux
> +- pinctrl-1: pinctrl node for touch detection state pinmux

"touch detection" for default is rather confusing or even wrong. The
Idle state is used for pen/touch detection, default is used for X/Y and
Pressure measurement (maybe better described as touch measurement).

> +- pinctrl-2: pinctrl node for gpios functioning as FET gate drivers
> +- vf50-ts-min-pressure: pressure level at which to stop measuring X/Y values
> +
> +Example:
> +
> +	touchctrl: vf50_touchctrl {
> +		compatible = "toradex,vf50-touchscreen";
> +		io-channels = <&adc1 0>,<&adc0 0>,
> +				<&adc0 1>,<&adc1 2>;
> +		xp-gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
> +		xm-gpios = <&gpio2 29 GPIO_ACTIVE_HIGH>;
> +		yp-gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
> +		ym-gpios = <&gpio0 4 GPIO_ACTIVE_HIGH>;
> +		interrupt-parent = <&gpio0>;
> +		interrupts = <8 IRQ_TYPE_LEVEL_LOW>;
> +		pinctrl-names = "idle","default","gpios";
> +		pinctrl-0 = <&pinctrl_touchctrl_idle>;
> +		pinctrl-1 = <&pinctrl_touchctrl_default>;
> +		pinctrl-2 = <&pinctrl_touchctrl_gpios>;
> +		vf50-ts-min-pressure = <200>;
> +		status = "disabled";
> +	};

Otherwise I agree with 1 and 2:

Acked-by: Stefan Agner <stefan@...er.ch>

--
Stefan

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