linux-kernel - Re: [PATCH v3 10/13] ASoC: dt-bindings: Add WCD9335 MBHC specific properties

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Date:   Mon, 10 Sep 2018 15:06:53 -0500
From:   Rob Herring <robh@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     lee.jones@...aro.org, broonie@...nel.org, mark.rutland@....com,
        lgirdwood@...il.com, bgoswami@...eaurora.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        vkoul@...nel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH v3 10/13] ASoC: dt-bindings: Add WCD9335 MBHC specific
 properties

On Tue, Sep 04, 2018 at 11:24:57AM +0100, Srinivas Kandagatla wrote:
> This patch add new bindings required to support MBHC
> (Multi Button Headset Control) block in the codec.
> This block is used for jack insert/removal detection,
> headset type detection and 8 button press/release events.
> 
> All these properties are very much specific to board.
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  .../bindings/sound/qcom,wcd9335.txt           | 20 +++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/qcom,wcd9335.txt b/Documentation/devicetree/bindings/sound/qcom,wcd9335.txt
> index 5d6ea66a863f..4d56c3ca9fa8 100644
> --- a/Documentation/devicetree/bindings/sound/qcom,wcd9335.txt
> +++ b/Documentation/devicetree/bindings/sound/qcom,wcd9335.txt
> @@ -55,6 +55,26 @@ Required properties with SLIMbus Interface:
>  	Value type: <string>
>  	Definition: Must contain "mclk", "mclk2" and "slimbus" strings.
>  
> +- qcom,mbhc-vthreshold:

Needs unit suffix.

> +	Usage: Optional, only required if headset button support required.
> +	Value type: <u32 array>
> +	Definition: Must contain an array of 8 threshold voltages in mV for
> +		 8 buttons detection on headset.
> +
> +- qcom,hphl-jack-type-normally-open:
> +	Usage: Optional, only required if headset button support required.

It's not required if the pin is NC, right?

> +	Value type: <boolean>
> +	Definition: present if hphl pin on jack is a NO (Normally Open).
> +		If not specified, then its assumed that hphl pin on jack
> +		is NC (Normally Closed).

Is the not specified case the more common case? If not, it should be.

> +
> +- qcom,gnd-jack-type-normally-open:
> +	Usage: Optional, only required if headset button support required.

Same here.

> +	Value type: <boolean>
> +	Definition: present if gnd pin on jack is NO (Normally Open).
> +		 If not specified, then its assumed that gnd pin on
> +		 jack is NC  (Normally Closed).
> +
>  - vdd-buck-supply:
>  	Usage: required
>  	Value type: <phandle>
> -- 
> 2.18.0
>