sound: sof: add sof client driver for terminal.

To be used for SOF shell and GDB. WIP.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Author: lrgirdwo

sound/soc/sof/Kconfig

@@ -271,6 +271,18 @@ config SND_SOC_SOF_DEBUG_FW_GDB
 	  socket, to which GDB can then connect.
 	  If unsure, select "N".
 
+config SND_SOC_SOF_SERIAL
+	tristate "SOF serial port client driver"
+	depends on SND_SOC_SOF
+	select SND_SOC_SOF_CLIENT
+	help
+	  This enables a virtual serial port (tty) client for the SOF DSP.
+	  The driver registers a ttysof0 device that exchanges shell data
+	  with IPC4 firmware through the ADSP shell debug window using the
+	  Zephyr sys_winstream format. A debugfs file is also created to
+	  expose the shared DSP memory window for inspection and testing.
+	  Only IPC4 is supported.  If unsure, select "N".
+
 config SND_SOC_SOF_DEBUG_RETAIN_DSP_CONTEXT
 	bool "SOF retain DSP context on any FW exceptions"
 	help

sound/soc/sof/Makefile

@@ -36,6 +36,7 @@ ifneq ($(CONFIG_SND_SOC_SOF_IPC4),)
 snd-sof-probes-y += sof-client-probes-ipc4.o
 endif
 snd-sof-fw-gdb-objs := sof-client-fw-gdb.o
+snd-sof-serial-y := sof-client-serial.o
 
 snd-sof-nocodec-y := nocodec.o
 
@@ -55,6 +56,7 @@ obj-$(CONFIG_SND_SOC_SOF_DEBUG_IPC_MSG_INJECTOR) += snd-sof-ipc-msg-injector.o
 obj-$(CONFIG_SND_SOC_SOF_DEBUG_IPC_KERNEL_INJECTOR) += snd-sof-ipc-kernel-injector.o
 obj-$(CONFIG_SND_SOC_SOF_DEBUG_PROBES) += snd-sof-probes.o
 obj-$(CONFIG_SND_SOC_SOF_DEBUG_FW_GDB) += snd-sof-fw-gdb.o
+obj-$(CONFIG_SND_SOC_SOF_SERIAL) += snd-sof-serial.o
 
 obj-$(CONFIG_SND_SOC_SOF_INTEL_TOPLEVEL) += intel/
 obj-$(CONFIG_SND_SOC_SOF_IMX_TOPLEVEL) += imx/