linux-kernel - Re: [PATCH 4/5] mfd: arizona: Add micdet ranges and polarity device tree bindings

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Date:	Mon, 23 Sep 2013 15:41:26 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
CC:	lee.jones@...aro.org, sameo@...ux.intel.com,
	rob.herring@...xeda.com, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, rob@...dley.net, broonie@...nel.org,
	patches@...nsource.wolfsonmicro.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] mfd: arizona: Add micdet ranges and polarity device
 tree bindings

On 09/23/2013 12:30 PM, Charles Keepax wrote:
> Add device tree bindings for the pdata that configures the microphone
> button detection and microphone detection polarity configurations.

> diff --git a/Documentation/devicetree/bindings/mfd/arizona.txt b/Documentation/devicetree/bindings/mfd/arizona.txt

> +  - wlf,micd-ranges : Microphone detection level and key configuration, this
> +    field can be of variable length but should always be a multiple of 2 cells
> +    long, each two cell group represents one button configuration
> +    The first cell is the maximum impedance for this button in ohms
> +    The second cell the key that should be reported to the input layer

Is there a limit on how many ranges can be specified? Are the impedance
values arbitrary, or limited to some pre-determined set of values
supported by HW?

> +  - wlf,micd-configs : Headset polarity configurations, the field can be of
> +    variable length but should always be a multiple of 3 cells long, each two

s/two/three/

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