ASoC: loongson: Combined regmap definitions

Previously, the regmap configuration for Loongson I2S controller was
duplicated in both PCI and platform glue drivers. Move the common
regmap configuration into the shared loongson_i2s.c to avoid code
duplication and centralize register access handling.

While moving, adjust the following:
- Mark RX_DATA/TX_DATA/I2S_CTRL as volatile registers. The PCI version
  incorrectly marked CFG/CFG1 as volatile, which prevented proper
  regcache synchronization.
- Change cache type from REGCACHE_FLAT to REGCACHE_MAPLE. The register
  map is sparse and the number of registers is small; MAPLE tree provides
  better scalability and is the recommended cache type for modern
  regmap users.

Also, the following warning for the i2s_plat driver will be eliminated:

loongson-i2s-plat loongson-i2s: using zero-initialized flat cache, this may cause unexpected behavior.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Link: https://patch.msgid.link/e32d24479fc382dc3de6aded6351c13b43b6391d.1780304703.git.zhoubinbin@loongson.cn
Signed-off-by: Mark Brown <broonie@kernel.org>

0 files changed, 0 insertions, 0 deletions