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SubjectRe: [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@serbinski.com>
>> CC: Andy Gross <agross@kernel.org>
>> CC: Mark Rutland <mark.rutland@arm.com>
>> CC: Liam Girdwood <lgirdwood@gmail.com>
>> CC: Patrick Lai <plai@codeaurora.org>
>> CC: Banajit Goswami <bgoswami@codeaurora.org>
>> CC: Jaroslav Kysela <perex@perex.cz>
>> CC: Takashi Iwai <tiwai@suse.com>
>> CC: alsa-devel@alsa-project.org
>> CC: linux-arm-msm@vger.kernel.org
>> CC: devicetree@vger.kernel.org
>> CC: linux-kernel@vger.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>;
>> + };
>> };
>> };
>>

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