[PATCH v3 0/4] media: synopsys: hdmirx: add HDMI audio capture support

[Igor Paunovic <royalnet026@gmail.com>]

This series adds audio capture support to the Synopsys DesignWare HDMI
RX controller used on the Rockchip RK3588: the controller's audio FIFO
is exposed through an ASoC hdmi-codec device, with a periodic worker
that keeps the local audio clock locked to the incoming stream by
tracking the FIFO fill level. Together with the two new dts patches
this yields a capture-only ALSA card fed by the HDMI input.

Validated on the Orange Pi 5 Plus against multiple HDMI sources:
capture follows the source sample rate (44.1/48 kHz switches
included), survives repeated stream start/stop cycles and SIGKILL of
the capturing process, and stays free of FIFO under/overruns via the
clock tracking.

Changes in v3:
- Restored the v1 audio teardown in remove(): the worker is only
  armed while a capture stream is active and audio_shutdown() already
  stops it, so the extra flag clear and trailing cancel added in v2
  were redundant (Dmitry Osipenko's review; the v2 change came from
  an incorrect automated-review finding)
- Renamed the ACR read locals and added a comment documenting the
  register byte packing that makes the swap correct
- Dropped the get_dai_id stub so OF-graph cards resolve the DAI index
  from the reg property naturally
- New patches 3 and 4: dts enablement, so the series is testable end
  to end (requested by Dmitry). Patch 3 adds #sound-dai-cells to the
  RK3588 hdmi_receiver node, patch 4 wires up the Orange Pi 5 Plus
  hdmiin sound card. Both can go through the rockchip tree instead if
  preferred.

Link to v2: https://lore.kernel.org/linux-media/20260715200834.8486-1-royalnet026@gmail.com/
Link to v1 (RFC): https://lore.kernel.org/linux-media/20260715051939.64652-1-royalnet026@gmail.com/

Igor Paunovic (4):
  dt-bindings: media: snps,dw-hdmi-rx: add #sound-dai-cells
  media: synopsys: hdmirx: add HDMI audio capture support
  arm64: dts: rockchip: add #sound-dai-cells to the RK3588 HDMI receiver
  arm64: dts: rockchip: enable HDMI RX audio capture on Orange Pi 5 Plus

 .../bindings/media/snps,dw-hdmi-rx.yaml       |   9 +
 .../arm64/boot/dts/rockchip/rk3588-extra.dtsi |   1 +
 .../dts/rockchip/rk3588-orangepi-5-plus.dts   |  20 ++
 .../platform/synopsys/hdmirx/snps_hdmirx.c    | 271 ++++++++++++++++++
 .../platform/synopsys/hdmirx/snps_hdmirx.h    |   8 +
 5 files changed, 309 insertions(+)

-- 
2.53.0