ASoC: fsl_easrc: Add EASRC ASoC CPU DAI drivers

EASRC (Enhanced Asynchronous Sample Rate Converter) is a new IP module
found on i.MX8MN. It is different with old ASRC module.

The primary features for the EASRC are as follows:
- 4 Contexts - groups of channels with an independent time base
- Fully independent and concurrent context control
- Simultaneous processing of up to 32 audio channels
- Programmable filter charachteristics for each context
- 32, 24, 20, and 16-bit fixed point audio sample support
- 32-bit floating point audio sample support
- 8kHz to 384kHz sample rate
- 1/16 to 8x sample rate conversion ratio

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Cosmin-Gabriel Samoila <cosmin.samoila@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Link: https://lore.kernel.org/r/260d7a9fbddf9fa90760d30095df60a4c25fd0a1.1587038908.git.shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/Kconfig

@@ -84,6 +84,17 @@ config SND_SOC_FSL_MICFIL
 	  Say Y if you want to add Pulse Density Modulation microphone
 	  interface (MICFIL) support for NXP.
 
+config SND_SOC_FSL_EASRC
+	tristate "Enhanced Asynchronous Sample Rate Converter (EASRC) module support"
+	depends on SND_SOC_FSL_ASRC
+	select REGMAP_MMIO
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	help
+	  Say Y if you want to add Enhanced ASRC support for NXP. The ASRC is
+	  a digital module that converts audio from a source sample rate to a
+	  destination sample rate. It is a new design module compare with the
+	  old ASRC.
+
 config SND_SOC_FSL_UTILS
 	tristate
 

sound/soc/fsl/Makefile

@@ -24,6 +24,7 @@ snd-soc-fsl-micfil-objs := fsl_micfil.o
 snd-soc-fsl-utils-objs := fsl_utils.o
 snd-soc-fsl-dma-objs := fsl_dma.o
 snd-soc-fsl-mqs-objs := fsl_mqs.o
+snd-soc-fsl-easrc-objs := fsl_easrc.o
 
 obj-$(CONFIG_SND_SOC_FSL_AUDMIX) += snd-soc-fsl-audmix.o
 obj-$(CONFIG_SND_SOC_FSL_ASOC_CARD) += snd-soc-fsl-asoc-card.o
@@ -35,6 +36,7 @@ obj-$(CONFIG_SND_SOC_FSL_ESAI) += snd-soc-fsl-esai.o
 obj-$(CONFIG_SND_SOC_FSL_MICFIL) += snd-soc-fsl-micfil.o
 obj-$(CONFIG_SND_SOC_FSL_UTILS) += snd-soc-fsl-utils.o
 obj-$(CONFIG_SND_SOC_FSL_MQS) += snd-soc-fsl-mqs.o
+obj-$(CONFIG_SND_SOC_FSL_EASRC) += snd-soc-fsl-easrc.o
 obj-$(CONFIG_SND_SOC_POWERPC_DMA) += snd-soc-fsl-dma.o
 
 # MPC5200 Platform Support