drivers: add new audio dai driver interface

The DAI (digital audio interface) API is a high level audio driver
abstraction. It provides support for the standard I2S (SSP), DMIC, HDA
and SDW backends. The API has a config function with bespoke data
argument for device/vendor specific config. There are also optional
timestamping functions to get device specific audio clock time.

Signed-off-by: Jaska Uimonen <jaska.uimonen@linux.intel.com>

doc/develop/api/overview.rst

@@ -67,6 +67,11 @@ current :ref:`stability level <api_lifecycle>`.
      - 2.3
      - 2.3
 
+   * - :ref:`dai_api`
+     - Experimental
+     - 3.2
+     - 3.2
+
    * - :ref:`dma_api`
      - Stable
      - 1.5

doc/hardware/peripherals/audio/dai.rst

@@ -0,0 +1,23 @@
+.. _dai_api:
+
+
+DAI
+####
+
+Overview
+********
+
+The DAI (Digital Audio Interface) is a generic high level API for audio drivers.
+It can be configured with bespoke data for vendor specific configuration.
+
+Configuration Options
+*********************
+
+Related configuration options:
+
+* :kconfig:option:`CONFIG_DAI`
+
+API Reference
+*************
+
+.. doxygengroup:: dai_interface

doc/hardware/peripherals/audio/index.rst

@@ -9,3 +9,4 @@ Audio
    codec.rst
    dmic.rst
    i2s.rst
+   dai.rst