ultrasoc: Add System Memory Buffer driver

This patch adds driver for System Memory Buffer. It includes
a platform driver for the SMB device.

Signed-off-by: Jonathan Zhou <jonathan.zhouwen@huawei.com>
Signed-off-by: Qi Liu <liuqi115@huawei.com>

drivers/hwtracing/ultrasoc/Kconfig

@@ -22,4 +22,13 @@ config ULTRASOC_AXI_COM
 	  the upstream channel is used to transmit user configuration, and
 	  downstream channel to carry response and trace data to the users.
 
+config ULTRASOC_SMB
+	tristate "Ultrasoc System memory buffer drivers"
+	help
+	  This config enables support for Ultrasoc System Memory Buffer
+	  drivers. The System Memory Buffer provides a way to buffer and
+	  store messages in system memory. It provides a capability to
+	  store messages received on its input message interface to an
+	  area of system memory.
+
 endif

drivers/hwtracing/ultrasoc/Makefile

@@ -8,3 +8,6 @@ ultrasoc-drv-objs := ultrasoc.o
 
 obj-$(CONFIG_ULTRASOC_AXI_COM) += ultrasoc-axi-com-drv.o
 ultrasoc-axi-com-drv-objs := ultrasoc-axi-com.o
+
+obj-$(CONFIG_ULTRASOC_SMB) += ultrasoc-smb-drv.o
+ultrasoc-smb-drv-objs := ultrasoc-smb.o