ASoC: renesas: add MSIOF sound support

Renesas MSIOF (Clock-Synchronized Serial Interface with FIFO) can work as
both SPI and I2S. Adds MSIOF-I2S driver.

MSIOF-SPI/I2S are using same DT compatible properties.
MSIOF-I2S         uses Of-Graph for Audio-Graph-Card/Card2,
MSIOF-SPI doesn't use  Of-Graph.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/87r01q2wzv.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: morimoto

sound/soc/renesas/Kconfig

@@ -46,6 +46,13 @@ config SND_SOC_RCAR
 	help
 	  This option enables R-Car SRU/SCU/SSIU/SSI sound support
 
+config SND_SOC_MSIOF
+	tristate "R-Car series MSIOF support"
+	depends on OF
+	select SND_DMAENGINE_PCM
+	help
+	  This option enables R-Car MSIOF sound support
+
 config SND_SOC_RZ
 	tristate "RZ/G2L series SSIF-2 support"
 	depends on ARCH_RZG2L || COMPILE_TEST

sound/soc/renesas/rcar/Makefile

@@ -1,3 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 snd-soc-rcar-y		:= core.o gen.o dma.o adg.o ssi.o ssiu.o src.o ctu.o mix.o dvc.o cmd.o debugfs.o
 obj-$(CONFIG_SND_SOC_RCAR)	+= snd-soc-rcar.o
+
+snd-soc-msiof-y			:= msiof.o
+obj-$(CONFIG_SND_SOC_MSIOF)	+= snd-soc-msiof.o