ASoC: atmel-pdmic: add the Pulse Density Modulation Interface Controller

Add driver for the Pulse Density Modulation Interface
Controller. It comes with digitallly controlled gain,
a High-Pass and a SINCC filter.

Signed-off-by: Songjun Wu <songjun.wu@atmel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/atmel/Kconfig b/sound/soc/atmel/Kconfig
index 2d30464..06e099e 100644
--- a/sound/soc/atmel/Kconfig
+++ b/sound/soc/atmel/Kconfig
@@ -68,4 +68,13 @@
 	help
 	  Say Y if you want to add support for Atmel ASoC driver for boards using
 	  CLASSD.
+
+config SND_ATMEL_SOC_PDMIC
+	tristate "Atmel ASoC driver for boards using PDMIC"
+	depends on OF && (ARCH_AT91 || COMPILE_TEST)
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	select REGMAP_MMIO
+	help
+	  Say Y if you want to add support for Atmel ASoC driver for boards using
+	  PDMIC.
 endif