ASoC: Add initial ZL38060 driver

The ZL38060 is a "Connected Home Audio Processor" from Microsemi,
which consists of a Digital Signal Processor (DSP), several Digital
Audio Interfaces (DAIs), analog outputs, and a block of 14 GPIOs.

This driver supports only a tiny subset of the chip's functionality
and possible configurations:
- bypass mode (whole dsp block is bypassed)
- chip's I2S DAI routed directly to/from DACs and microphone
- chip's internal clock is driven by a 12 MHz external crystal
- chip's DAI connected to CPU is I2S, and bit + frame clock master
- chip must be strapped for "host boot": in this mode, firmware will
  be provided by this driver.

Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com>
Link: https://lore.kernel.org/r/20200417221341.31428-2-TheSven73@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/Kconfig

@@ -272,6 +272,7 @@ config SND_SOC_ALL_CODECS
 	imply SND_SOC_WM9712
 	imply SND_SOC_WM9713
 	imply SND_SOC_WSA881X
+	imply SND_SOC_ZL38060
 	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
@@ -1645,6 +1646,16 @@ config SND_SOC_WSA881X
 	  This enables support for Qualcomm WSA8810/WSA8815 Class-D
 	  Smart Speaker Amplifier.
 
+config SND_SOC_ZL38060
+	tristate "Microsemi ZL38060 Connected Home Audio Processor"
+	depends on SPI_MASTER
+	select GPIOLIB
+	select REGMAP
+	help
+	  Support for ZL38060 Connected Home Audio Processor from Microsemi,
+	  which consists of a Digital Signal Processor (DSP), several Digital
+	  Audio Interfaces (DAIs), analog outputs, and a block of 14 GPIOs.
+
 config SND_SOC_ZX_AUD96P22
 	tristate "ZTE ZX AUD96P22 CODEC"
 	depends on I2C

sound/soc/codecs/Makefile

@@ -288,6 +288,7 @@ 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-zl38060-objs := zl38060.o
 snd-soc-zx-aud96p22-objs := zx_aud96p22.o
 # Amp
 snd-soc-max9877-objs := max9877.o
@@ -588,6 +589,7 @@ 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-$(CONFIG_SND_SOC_ZL38060)	+= snd-soc-zl38060.o
 obj-$(CONFIG_SND_SOC_ZX_AUD96P22) += snd-soc-zx-aud96p22.o
 
 # Amp