linux-kernel - Re: [PATCH v3 6/6] ASoC: qdsp6: dt-bindings: Add q6afe pcm dt binding documentation

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Message-ID: <2989c09149976a28d13d4b4eb10b7c7e@serbinski.com>
Date:   Wed, 12 Feb 2020 06:01:46 -0500
From:   Adam Serbinski <adam@...binski.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Patrick Lai <plai@...eaurora.org>,
        Banajit Goswami <bgoswami@...eaurora.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 6/6] ASoC: qdsp6: dt-bindings: Add q6afe pcm dt binding
 documentation

On 2020-02-12 04:59, Srinivas Kandagatla wrote:
> On 12/02/2020 01:52, Adam Serbinski wrote:
>> This patch adds documentation of bindings required for PCM ports on 
>> AFE.
>> 
>> Signed-off-by: Adam Serbinski <adam@...binski.com>
>> CC: Andy Gross <agross@...nel.org>
>> CC: Mark Rutland <mark.rutland@....com>
>> CC: Liam Girdwood <lgirdwood@...il.com>
>> CC: Patrick Lai <plai@...eaurora.org>
>> CC: Banajit Goswami <bgoswami@...eaurora.org>
>> CC: Jaroslav Kysela <perex@...ex.cz>
>> CC: Takashi Iwai <tiwai@...e.com>
>> CC: alsa-devel@...a-project.org
>> CC: linux-arm-msm@...r.kernel.org
>> CC: devicetree@...r.kernel.org
>> CC: linux-kernel@...r.kernel.org
>> ---
>>   .../devicetree/bindings/sound/qcom,q6afe.txt  | 42 
>> +++++++++++++++++++
>>   1 file changed, 42 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/sound/qcom,q6afe.txt 
>> b/Documentation/devicetree/bindings/sound/qcom,q6afe.txt
>> index d74888b9f1bb..6b1b17d31a2a 100644
>> --- a/Documentation/devicetree/bindings/sound/qcom,q6afe.txt
>> +++ b/Documentation/devicetree/bindings/sound/qcom,q6afe.txt
>> @@ -51,6 +51,24 @@ configuration of each dai. Must contain the 
>> following properties.
>>   	Definition: Must be list of serial data lines used by this dai.
>>   	should be one or more of the 0-3 sd lines.
>>   + - qcom,pcm-quantype
>> +	Usage: required for pcm interface
>> +	Value type: <u32>
>> +	Definition: PCM quantization type
>> +		0 - ALAW, no padding
>> +		1 - MULAW, no padding
>> +		2 - Linear, no padding
>> +		3 - ALAW, padding
>> +		4 - MULAW, padding
>> +		5 - Linear, padding
>> +
>> + - qcom,pcm-slot-mapping
>> +	Usage: required for pcm interface
> 
> Are these not specific to 8k and 16k mode ?
> We should probably list values for both modes here.

No, this is just the offset that the audio sample is placed in with 
respect to a maximum of 4 slots, 16 bits wide, beginning with the sync 
pulse.

When switching between 8 and 16k sample rate, it is just the sync pulse 
rate that is changed. The audio sample will be delivered in the same 
slot, just at a different frequency.


>> +	Value type: <prop-encoded-array>
>> +	Definition: Slot mapping for audio channels. Array size is the 
>> number
>> +		of slots, minimum 1, maximum 4. The value is 0 for no mapping
>> +		to the slot, or the channel number from 1 to 32.
>> +
>>    - qcom,tdm-sync-mode:
>>   	Usage: required for tdm interface
>>   	Value type: <prop-encoded-array>
>> @@ -174,5 +192,29 @@ q6afe@4 {
>>   			reg = <23>;
>>   			qcom,sd-lines = <1>;
>>   		};
>> +
>> +		pri-pcm-rx@105 {
>> +			reg = <105>;
>> +			qcom,pcm-quantype = <2>;
>> +			qcom,pcm-slot-mapping = <1>;
>> +		};
>> +
>> +		pri-pcm-tx@106 {
>> +			reg = <106>;
>> +			qcom,pcm-quantype = <2>;
>> +			qcom,pcm-slot-mapping = <1>;
>> +		};
>> +
>> +		quat-pcm-rx@111 {
>> +			reg = <111>;
>> +			qcom,pcm-quantype = <5>;
>> +			qcom,pcm-slot-mapping = <0 0 1>;
>> +		};
>> +
>> +		quat-pcm-tx@112 {
>> +			reg = <112>;
>> +			qcom,pcm-quantype = <5>;
>> +			qcom,pcm-slot-mapping = <0 0 1>;
>> +		};
>>   	};
>>   };
>>