Masayuki Ishikawa fb07bd7e27 Adds loopback test for digital MIC on lc823450 via i2schar driver.
Squashed commit of:

  configs/lc823450-xgevk: Enable DMDIN0 (Digital MIC)
  I2S: Add ioctl interface to i2s_ops_s and i2schar driver
  arch/arm/src/lc823450: Add DGMIC in lc823450_i2s.c
  configs/lc823450-xgevk: Add i2schar driver to lc823450_wm8776.c
  configs/lc824350-xgevk: Enable AUDIO_I2SCHAR in audio/defconfig
  configs/lc823450-xgevk: Update README.txt
2018-06-05 10:34:22 -06:00
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