Hi all,

On 25/07/2023 08:12, Shengjiu Wang wrote:

Audio signal processing has the requirement for memory to
memory similar as Video.

This patch is to add this support in v4l2 framework, defined
new buffer type V4L2_BUF_TYPE_AUDIO_CAPTURE and
V4L2_BUF_TYPE_AUDIO_OUTPUT, defined new format v4l2_audio_format
for audio case usage.

The created audio device is named "/dev/audioX".

And add memory to memory support for two kinds of i.MX ASRC
module

Before I spend time on this: are the audio maintainers OK with doing
this in V4L2?

I do want to have a clear statement on this as it is not something I
can decide.

Regards,

	Hans

changes in v2:
- decouple the implementation in v4l2 and ALSA
- implement the memory to memory driver as a platfrom driver
  and move it to driver/media
- move fsl_asrc_common.h to include/sound folder

Shengjiu Wang (7):
  ASoC: fsl_asrc: define functions for memory to memory usage
  ASoC: fsl_easrc: define functions for memory to memory usage
  ASoC: fsl_asrc: move fsl_asrc_common.h to include/sound
  media: v4l2: Add audio capture and output support
  media: imx: fsl_asrc: Add memory to memory driver
  ASoC: fsl_asrc: register m2m platform device
  ASoC: fsl_easrc: register m2m platform device

 .../media/common/videobuf2/videobuf2-v4l2.c   |   4 +
 drivers/media/platform/nxp/Kconfig            |  12 +
 drivers/media/platform/nxp/Makefile           |   1 +
 drivers/media/platform/nxp/fsl_asrc_m2m.c     | 962 ++++++++++++++++++
 drivers/media/v4l2-core/v4l2-dev.c            |  17 +
 drivers/media/v4l2-core/v4l2-ioctl.c          |  52 +
 include/media/v4l2-dev.h                      |   2 +
 include/media/v4l2-ioctl.h                    |  34 +
 .../fsl => include/sound}/fsl_asrc_common.h   |  48 +
 include/uapi/linux/videodev2.h                |  19 +
 sound/soc/fsl/fsl_asrc.c                      | 150 +++
 sound/soc/fsl/fsl_asrc.h                      |   4 +-
 sound/soc/fsl/fsl_asrc_dma.c                  |   2 +-
 sound/soc/fsl/fsl_easrc.c                     | 227 +++++
 sound/soc/fsl/fsl_easrc.h                     |   8 +-
 15 files changed, 1539 insertions(+), 3 deletions(-)
 create mode 100644 drivers/media/platform/nxp/fsl_asrc_m2m.c
 rename {sound/soc/fsl => include/sound}/fsl_asrc_common.h (63%)