ASoC: codecs: add wsa881x amplifier support

This patch adds support to WSA8810/WSA8815 Class-D Smart Speaker
Amplifier. This Amplifier is primarily interfaced with SoundWire.
One WSA is used for mono speaker configuration and second one
would give stereo setup.

This patch is tested on SDM845 based DragonBoard DB845c and
Lenovo YOGA C630 Laptop based on SDM850 with WSA8815
speaker amplifiers.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200107135929.3267-3-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/Kconfig

@@ -262,6 +262,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_WM9705 if (SND_SOC_AC97_BUS || SND_SOC_AC97_BUS_NEW)
 	select SND_SOC_WM9712 if (SND_SOC_AC97_BUS || SND_SOC_AC97_BUS_NEW)
 	select SND_SOC_WM9713 if (SND_SOC_AC97_BUS || SND_SOC_AC97_BUS_NEW)
+	select SND_SOC_WSA881X if SOUNDWIRE
 	help
 	  Normally ASoC codec drivers are only built if a machine driver which
 	  uses them is also built since they are only usable with a machine
@@ -1481,6 +1482,15 @@ config SND_SOC_WM9713
 	select REGMAP_AC97
 	select AC97_BUS_COMPAT if AC97_BUS_NEW
 
+config SND_SOC_WSA881X
+	tristate "WSA881X Codec"
+	depends on SOUNDWIRE
+	select REGMAP_SOUNDWIRE
+	tristate
+	help
+	  This enables support for Qualcomm WSA8810/WSA8815 Class-D
+	  Smart Speaker Amplifier.
+
 config SND_SOC_ZX_AUD96P22
 	tristate "ZTE ZX AUD96P22 CODEC"
 	depends on I2C

sound/soc/codecs/Makefile

@@ -278,6 +278,7 @@ snd-soc-wm9705-objs := wm9705.o
 snd-soc-wm9712-objs := wm9712.o
 snd-soc-wm9713-objs := wm9713.o
 snd-soc-wm-hubs-objs := wm_hubs.o
+snd-soc-wsa881x-objs := wsa881x.o
 snd-soc-zx-aud96p22-objs := zx_aud96p22.o
 # Amp
 snd-soc-max9877-objs := max9877.o
@@ -568,6 +569,7 @@ obj-$(CONFIG_SND_SOC_WM9712)	+= snd-soc-wm9712.o
 obj-$(CONFIG_SND_SOC_WM9713)	+= snd-soc-wm9713.o
 obj-$(CONFIG_SND_SOC_WM_ADSP)	+= snd-soc-wm-adsp.o
 obj-$(CONFIG_SND_SOC_WM_HUBS)	+= snd-soc-wm-hubs.o
+obj-$(CONFIG_SND_SOC_WSA881X)	+= snd-soc-wsa881x.o
 obj-$(CONFIG_SND_SOC_ZX_AUD96P22) += snd-soc-zx-aud96p22.o
 
 # Amp