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 padding1 - MULAW, no padding2 - Linear, no padding3 - ALAW, padding4 - MULAW, padding5 - 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 mappingto the slot, or the channel number from 1 to 32.Usage: required for tdm interface Value type: <prop-encoded-array>
- qcom,tdm-sync-mode:
@@ -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>;};