linux-kernel - Re: [PATCH v2 1/2] Input: bcm-keypad: add device tree bindings

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Date:	Fri, 27 Feb 2015 15:39:26 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Scott Branden <sbranden@...adcom.com>
Cc:	bcm-kernel-feedback-list@...adcom.com,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Ray Jui <rjui@...adcom.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Dmitry Torokhov <dtor@...gle.com>,
	Anatol Pomazao <anatol@...gle.com>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] Input: bcm-keypad: add device tree bindings

Hi Scott,

On Thu, Feb 26, 2015 at 08:08:48AM -0800, Scott Branden wrote:
> Documents the Broadcom keypad controller device tree bindings.
> 
> Reviewed-by: Ray Jui <rjui@...adcom.com>
> Signed-off-by: Scott Branden <sbranden@...adcom.com>
> ---
>  .../devicetree/bindings/input/brcm,bcm-keypad.txt  | 108 +++++++++++++++++++++
>  1 file changed, 108 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/brcm,bcm-keypad.txt
> 
> diff --git a/Documentation/devicetree/bindings/input/brcm,bcm-keypad.txt b/Documentation/devicetree/bindings/input/brcm,bcm-keypad.txt
> new file mode 100644
> index 0000000..e16bb2d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/brcm,bcm-keypad.txt
> @@ -0,0 +1,108 @@
> +* Broadcom Keypad Controller device tree bindings
> +
> +Broadcom Keypad controller is used to interface a SoC with a matrix-type
> +keypad device. The keypad controller supports multiple row and column lines.
> +A key can be placed at each intersection of a unique row and a unique column.
> +The keypad controller can sense a key-press and key-release and report the
> +event using a interrupt to the cpu.
> +
> +This binding is based on the matrix-keymap binding with the following
> +changes:
> +
> +keypad,num-rows and keypad,num-columns are required.
> +
> +Required SoC Specific Properties:
> +- compatible: should be "brcm,bcm-keypad"
> +
> +- reg: physical base address of the controller and length of memory mapped
> +  region.
> +
> +- interrupts: The interrupt number to the cpu.
> +
> +Board Specific Properties:
> +- keypad,num-rows: Number of row lines connected to the keypad
> +  controller.
> +
> +- keypad,num-columns: Number of column lines connected to the
> +  keypad controller.
> +
> +- col-debounce-filter-period: The debounce period for the Column filter.
> +
> +	KEYPAD_DEBOUNCE_1_ms	=	0
> +	KEYPAD_DEBOUNCE_2_ms	=	1
> +	KEYPAD_DEBOUNCE_4_ms	=	2
> +	KEYPAD_DEBOUNCE_8_ms	=	3
> +	KEYPAD_DEBOUNCE_16_ms	=	4
> +	KEYPAD_DEBOUNCE_32_ms	=	5
> +	KEYPAD_DEBOUNCE_64_ms	=	6
> +	KEYPAD_DEBOUNCE_128_ms	=	7
> +
> +- status-debounce-filter-period: The debounce period for the Status filter.
> +
> +	KEYPAD_DEBOUNCE_1_ms	=	0
> +	KEYPAD_DEBOUNCE_2_ms	=	1
> +	KEYPAD_DEBOUNCE_4_ms	=	2
> +	KEYPAD_DEBOUNCE_8_ms	=	3
> +	KEYPAD_DEBOUNCE_16_ms	=	4
> +	KEYPAD_DEBOUNCE_32_ms	=	5
> +	KEYPAD_DEBOUNCE_64_ms	=	6
> +	KEYPAD_DEBOUNCE_128_ms	=	7
> +
> +- row-output-enabled: An optional property indicating whether the row or
> +  column is being used as output. If specified the row is being used
> +  as the output. Else defaults to column.
> +
> +- pull-up-enabled: An optional property indicating the Keypad scan mode.
> +  If specified implies the keypad scan pull-up has been enabled.
> +
> +- linux,keypad-no-autorepeat: An optional property indicating to
> +  not enable autorepeat feature.

Unfortunately we've accumulated a lot of bindings for turning autorepeat
on or off, I would prefer if we standardize on what gpio-keys is doing
and use "autorepeat" (no "linux,") for new drivers.

Thanks.

-- 
Dmitry
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