linux-kernel - Re: [PATCH v2 2/3] ASoC: tlv320adcx140: Add device tree property for PDM edges

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Date:   Thu, 14 May 2020 07:09:23 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Ricard Wanderlof <ricardw@...s.com>
CC:     "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>, Rob Herring <robh@...nel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] ASoC: tlv320adcx140: Add device tree property for
 PDM edges

Richard

On 5/14/20 3:09 AM, Ricard Wanderlof wrote:
> On Wed, 13 May 2020, Dan Murphy wrote:
>
>> Add a device tree property to configure the PDM sampling edge for each
>> digital microphone.
>>
>> CC: Rob Herring <robh@...nel.org>
>> Signed-off-by: Dan Murphy <dmurphy@...com>
>> ---
>>   .../devicetree/bindings/sound/tlv320adcx140.yaml   | 14 ++++++++++++++
>>   1 file changed, 14 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/sound/tlv320adcx140.yaml
>> b/Documentation/devicetree/bindings/sound/tlv320adcx140.yaml
>> index ab2268c0ee67..55668c7d261d 100644
>> --- a/Documentation/devicetree/bindings/sound/tlv320adcx140.yaml
>> +++ b/Documentation/devicetree/bindings/sound/tlv320adcx140.yaml
>> @@ -63,6 +63,19 @@ properties:
>>         - $ref: /schemas/types.yaml#/definitions/uint32
>>         - enum: [0, 1, 2]
>>   
>> +  ti,pdm-edge-select:
>> +    description: |
>> +       Defines the sampling edge configuration for the PDM inputs.  This is
>> an
>> +       array defined as <PDMIN1 PDMIN2 PDMIN3 PDMIN4>. 0 (default) is
>> negative
>> +       sampling edge and 1 is positive sampling edge.
> A bit of a nitpick, but I would think of the edges as
> negative-going/positive-going, or rising/falling. Not sure if anyone would
> misunderstand 'negative edge' in practice though.

I will re-write the description to be more descriptive.

>> +    allOf:
>> +      - $ref: /schemas/types.yaml#/definitions/uint32-array
>> +      - minItems: 1
>> +        maxItems: 4
>> +        items:
>> +          maximum: 1
>> +        default: [0, 0, 0, 0]
>> +
>>   required:
>>     - compatible
>>     - reg
>> @@ -77,6 +90,7 @@ examples:
>>           compatible = "ti,tlv320adc5140";
>>           reg = <0x4c>;
>>           ti,mic-bias-source = <6>;
>> +        ti,pdm-edge-select = < 0 1 0 1>;
> Should there really be a space between < and 0 ?

I will remove the space

Dan

>
> /Ricard