linux-kernel - Re: [PATCH 2/2] Documentation: dt: Document TSC2005 DT binding

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Date:	Mon, 9 Dec 2013 09:46:38 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Sebastian Reichel <sre@...ian.org>
Cc:	Sebastian Reichel <sre@...g0.de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Dmitry Torokhov <dtor@...l.ru>, linux-input@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Grant Likely <grant.likely@...aro.org>,
	devicetree@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Documentation: dt: Document TSC2005 DT binding

* Sebastian Reichel <sre@...ian.org> [131205 15:11]:
> Add devicetree binding documentation for TSC2005 touchscreen.
> 
> Signed-off-by: Sebastian Reichel <sre@...ian.org>
> ---
>  .../bindings/input/touchscreen/tsc2005.txt         | 49 ++++++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt b/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt
> new file mode 100644
> index 0000000..4e7df0b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt
> @@ -0,0 +1,49 @@
> +* TSC2005 Touchscreen
> +
> +Required properties:
> + - compatible		      : "ti,tsc2005"
> + - reg			      : SPI device address
> + - spi-max-frequency	      : Maximal SPI speed
> + - interrupts		      : IRQ specifier
> + - reset-gpio		      : GPIO specifier
> +
> +Optional properties:
> + - ti,fuzz-x		      : integer, X noise value of the touchscreen
> +				(defaults to 4)
> + - ti,fuzz-y		      : integer, Y noise value of the touchscreen
> +				(defaults to 8)
> + - ti,fuzz-pressure	      : integer, pressure noise value of the touchscreen
> +				(defaults to 2)
> + - ti,max-x		      : integer, maximum reported x value
> +				(defaults to 4096)
> + - ti,max-y		      : integer, maximum reported y value
> +				(defaults to 4096)
> + - ti,max-pressure	      : integer, maximum reported pressure
> +				(defaults to 4096)
> + - ti,x-plate-resistance      : integer, resistance of the touchscreen's X plates
> +				in ohm (defaults to 280)
> + - ti,esd-recovery-timeout-ms : integer, if the touchscreen does not respond after
> +				the configured time (in milli seconds), the driver
> +				will reset it. This is disabled by default.

Instead of adding these optional ti,* properties you can set them in the
driver directly in the of_match table based on the compatible flag. Then
you can pass compatible flag like ti,tsc2005-nokia-n900, or the name of
the LCD panel. Most likely these depend on the LCD panel selected.

Regards,

Tony


> +Example:
> +
> +&mcspi1 {
> +	tsc2005@0 {
> +		compatible = "ti,tsc2005";
> +		spi-max-frequency = <6000000>;
> +		reg = <0>;
> +		reset-gpio = <&gpio4 8 GPIO_ACTIVE_HIGH>; /* 104 */
> +		interrupt-parent = <&gpio4>;
> +		interrupts = <4 IRQ_TYPE_NONE>; /* gpio line 100 */
> +
> +		ti,fuzz-x = <4>;
> +		ti,fuzz-y = <7>;
> +		ti,fuzz-pressure = <2>;
> +		ti,max-x = <4096>;
> +		ti,max-y = <4096>;
> +		ti,max-pressure = <2048>;
> +		ti,x-plate-resistance = <280>;
> +		ti,esd-recovery-timeout-ms = <8000>;
> +	};
> +}
> -- 
> 1.8.4.3
> 
> --
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