ASoC: fsl_asrc: Add ASRC ASoC CPU DAI and platform drivers

The Asynchronous Sample Rate Converter (ASRC) converts the sampling rate of a
signal associated with an input clock into a signal associated with a different
output clock. The driver currently works as a Front End of DPCM with other Back
Ends DAI links such as ESAI<->CS42888 and SSI<->WM8962 and SAI. It converts the
original sample rate to a common rate supported by Back Ends for playback while
converts the common rate of Back Ends to a desired rate for capture. It has 3
pairs to support three different substreams within totally 10 channels.

Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Reviewed-by: Varka Bhadram <varkabhadram@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
index 37933629cbed..56fd32b3a881 100644
--- a/sound/soc/fsl/Kconfig
+++ b/sound/soc/fsl/Kconfig
@@ -2,6 +2,15 @@ menu "SoC Audio for Freescale CPUs"
 
 comment "Common SoC Audio options for Freescale CPUs:"
 
+config SND_SOC_FSL_ASRC
+        tristate "Asynchronous Sample Rate Converter (ASRC) module support"
+        select REGMAP_MMIO
+        help
+          Say Y if you want to add Asynchronous Sample Rate Converter (ASRC)
+          support for the Freescale CPUs.
+          This option is only useful for out-of-tree drivers since
+          in-tree drivers select it automatically.
+
 config SND_SOC_FSL_SAI
         tristate "Synchronous Audio Interface (SAI) module support"
         select REGMAP_MMIO