misc: Add Renesas Synchronization Management Unit (SMU) support

This driver supports 1588 related functions of ClockMatrix(TM)
and 82P33xxx families of timing and synchronization devices. The
supported functons are:

- set combomode
- get dpll's state
- get dpll's ffo

Please note that this driver needs to work with rsmu mfd driver
to access SMU through I2C/SPI.

Signed-off-by: Min Li <min.li.xe@renesas.com>

drivers/misc/Kconfig

@@ -466,6 +466,13 @@ config HISI_HIKEY_USB
 	  switching between the dual-role USB-C port and the USB-A host ports
 	  using only one USB controller.
 
+config RSMU
+	tristate "Renesas Synchronization Management Unit (SMU)"
+	depends on MFD_RSMU_I2C || MFD_RSMU_SPI
+	help
+	  This driver provides support for Renesas SMU,
+	  such as Clockmatrix and 82P33XXX series.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"

drivers/misc/Makefile

@@ -57,3 +57,6 @@ obj-$(CONFIG_HABANA_AI)		+= habanalabs/
 obj-$(CONFIG_UACCE)		+= uacce/
 obj-$(CONFIG_XILINX_SDFEC)	+= xilinx_sdfec.o
 obj-$(CONFIG_HISI_HIKEY_USB)	+= hisi_hikey_usb.o
+
+rsmu-objs			:= rsmu_cdev.o rsmu_cm.o rsmu_sabre.o
+obj-$(CONFIG_RSMU)		+= rsmu.o