ASoC: Add codec_ch_mask to snd_soc_dai_link_ch_map

Add a codec_ch_mask member to snd_soc_dai_link_ch_map.

The CPU and codec channel masks are not necessarily the same, and are
quite likely different. SoundWire and I2S/TDM both support assigning
different sample slots to each codec, so for example channel 0 on each
codec could map to different channels at the CPU.

It is also possible for one TX channel to map to multiple RX channels.
So it isn't _always_ safe to assume that the total number of set bits
in the CPU ch_mask is the same as the total number of enabled channels
on the codec.

For example consider this mapping on a capture stream:

CPU0 CODEC0 cpu_ch_mask = 0x03
CPU1 CODEC0 cpu_ch_mask = 0x03

This could be either four TX channels on the codec split across two
receiving CPUs, or two TX channels on the codec duplicated to two CPUs.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20260910114500.1586637-3-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

0 files changed, 0 insertions, 0 deletions