linux-kernel - Re: [PATCH 2/2] Documentation: DT: bindings: input: Add documentation for cyttsp5

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Date:   Wed, 7 Jun 2017 15:26:03 -0500
From:   Rob Herring <robh@...nel.org>
To:     Mylène Josserand 
        <mylene.josserand@...e-electrons.com>
Cc:     dmitry.torokhov@...il.com, fery@...ress.com, mark.rutland@....com,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        devicetree@...r.kernel.org, thomas.petazzoni@...e-electrons.com,
        maxime.ripard@...e-electrons.com
Subject: Re: [PATCH 2/2] Documentation: DT: bindings: input: Add
 documentation for cyttsp5

On Mon, May 29, 2017 at 04:45:38PM +0200, Mylène Josserand wrote:
> Add the Cypress TrueTouch Generation 5 touchscreen device tree bindings
> documentation. It can use I2C or SPI bus.
> This touchscreen can handle some defined zone that are designed and
> sent as button. To be able to customize the keycode sent, the
> "linux,code" property in a "button" sub-node can be used.

"documentation" twice in the subject makes for a long subject. 
The preferred subject prefix is "dt-bindings: input: ..."

> 
> Signed-off-by: Mylène Josserand <mylene.josserand@...e-electrons.com>
> ---
>  .../bindings/input/touchscreen/cyttsp5.txt         | 55 ++++++++++++++++++++++

cypress,cyttsp5.txt matching the compatible is preferred.

>  1 file changed, 55 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/cyttsp5.txt
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/cyttsp5.txt b/Documentation/devicetree/bindings/input/touchscreen/cyttsp5.txt
> new file mode 100644
> index 000000000000..713a377b5039
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/cyttsp5.txt
> @@ -0,0 +1,55 @@
> +* Cypress cyttsp touchscreen controller, generation 5
> +
> +Required properties:
> + - compatible		: must be "cypress,cyttsp5"
> + - reg			: Device I2C address or SPI chip select number
> + - interrupt-parent	: the phandle for the gpio controller
> +			  (see interrupt binding[0]).
> + - interrupts		: (gpio) interrupt to which the chip is connected
> +			  (see interrupt binding[0]).
> +
> +Optional properties (many of them coming from touchscreen binding[1]):
> + - reset-gpios		: the reset gpio the chip is connected to
> +			  (see GPIO binding[2] for more details).
> + - touchscreen-size-x	: horizontal resolution of touchscreen (in pixels)

Just "see ./touchscreen.txt" is enough description.

> + - touchscreen-size-y	: vertical resolution of touchscreen (in pixels)
> + - touchscreen-fuzz-x	: horizontal noise value of the absolute input device
> +			  (in pixels)
> + - touchscreen-fuzz-y	: vertical noise value of the absolute input device
> +			  (in pixels)
> +
> +This touchscreen can handle some buttons that are touchscreen's defined zones.
> +Each button's event can be customized using a sub-node properties:
> +	- linux,code: Keycode to emit.
> +
> +[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
> +[1]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
> +[2]: Documentation/devicetree/bindings/gpio/gpio.txt
> +
> +Example:
> +&i2c0 {
> +	[...]
> +
> +	tsc@24 {

touchscreen@24

> +		compatible = "cypress,cyttsp5";
> +		reg = <0x24>;
> +
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&tp_reset_ds203>;
> +		interrupt-parent = <&pio>;
> +		interrupts = <1 5 IRQ_TYPE_LEVEL_LOW>;
> +		reset-gpios = <&pio 7 1 GPIO_ACTIVE_HIGH>;
> +
> +		button@0 {

unit addresses need a reg property. If 0,1,2 are meaningful numbers for 
the hardware, then it makes sense to add here.

> +			linux,code = <KEY_HOMEPAGE>;
> +		};
> +
> +		button@1 {
> +			linux,code = <KEY_MENU>;
> +		};
> +
> +		button@2 {
> +			linux,code = <KEY_BACK>;
> +		};
> +	};
> +};
> -- 
> 2.11.0
>