linux-kernel - Re: [PATCH v3 2/3] Input: cyttsp

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Message-ID: <20160111030156.GA18656@rob-hp-laptop>
Date:	Sun, 10 Jan 2016 21:01:56 -0600
From:	Rob Herring <robh@...nel.org>
To:	Oreste Salerno <oreste.salerno@...tom.com>
Cc:	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	fery@...ress.com, dmitry.torokhov@...il.com, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 2/3] Input: cyttsp - add device tree bindings

On Sun, Jan 10, 2016 at 06:36:08PM +0100, Oreste Salerno wrote:
> Signed-off-by: Oreste Salerno <oreste.salerno@...tom.com>
> ---
>  .../bindings/input/touchscreen/cyttsp.txt          |  82 +++++++++++++
>  drivers/input/touchscreen/cyttsp_core.c            | 134 +++++++++++++++++++--
>  include/linux/input/cyttsp.h                       |   3 +
>  3 files changed, 212 insertions(+), 7 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/cyttsp.txt
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/cyttsp.txt b/Documentation/devicetree/bindings/input/touchscreen/cyttsp.txt
> new file mode 100644
> index 0000000..2dc5c65
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/cyttsp.txt
> @@ -0,0 +1,82 @@
> +* Cypress cyttsp touchscreen controller
> +
> +Required properties:
> +- compatible		: must be "cypress,cyttsp-i2c" or "cypress,cyttsp-spi"
> +- reg			: Device I2C address or SPI chip select number
> +- spi-max-frequency 	: Maximum SPI clocking speed of the device (for cyttsp-spi)
> +- 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]).
> +- reset-gpios		: the reset gpio the chip is connected to
> +			  (see GPIO binding[1] for more details).
> +- touchscreen-size-x	: horizontal resolution of touchscreen (in pixels)
> +- touchscreen-size-y	: vertical resolution of touchscreen (in pixels)
> +- bootloader-key	: the 8-byte bootloader key that is required to switch
> +			  the chip from bootloader mode (default mode) to
> +			  application mode.
> +			  This property has to be specified as an array of 8
> +			  '/bits/ 8' values.
> +
> +Optional properties:
> +- active-distance	: the distance in pixels beyond which a touch must move
> +			  before movement is detected and reported by the device.
> +			  Valid values: 0-15.

Wouldn't this be the same as touchscreen-fuzz-(x|y) which is the 
replacement for the deprecated moving-threshold? 

> +- active-interval-ms	: the minimum period in ms between consecutive
> +			  scanning/processing cycles when the chip is in active mode.
> +			  Valid values: 0-255.
> +- lowpower-interval-ms	: the minimum period in ms between consecutive
> +			  scanning/processing cycles when the chip is in low-power mode.
> +			  Valid values: 0-2550
> +- touch-timeout-ms	: minimum time in ms spent in the active power state while no
> +			  touches are detected before entering low-power mode.
> +			  Valid values: 0-2550
> +

Otherwise, looks fine.