soc: amd: Add support for AMD Pensando SoC Controller

The Pensando SoC controller is a SPI connected companion device
that is present in all Pensando SoC board designs.  The essential
board management registers are accessed on chip select 0 with
board mgmt IO support accessed using additional chip selects.

Signed-off-by: Brad Larson <blarson@amd.com>

drivers/soc/Kconfig

@@ -2,6 +2,7 @@
 menu "SOC (System On Chip) specific Drivers"
 
 source "drivers/soc/actions/Kconfig"
+source "drivers/soc/amd/Kconfig"
 source "drivers/soc/amlogic/Kconfig"
 source "drivers/soc/apple/Kconfig"
 source "drivers/soc/aspeed/Kconfig"

drivers/soc/Makefile

@@ -4,6 +4,7 @@
 #
 
 obj-$(CONFIG_ARCH_ACTIONS)	+= actions/
+obj-y				+= amd/
 obj-y				+= apple/
 obj-y				+= aspeed/
 obj-$(CONFIG_ARCH_AT91)		+= atmel/

drivers/soc/amd/Kconfig

@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menu "AMD Pensando SoC drivers"
+
+config AMD_PENSANDO_CTRL
+	tristate "AMD Pensando SoC Controller"
+	depends on SPI_MASTER=y
+	depends on (ARCH_PENSANDO && OF) || COMPILE_TEST
+	default ARCH_PENSANDO
+	select REGMAP_SPI
+	select MFD_SYSCON
+	help
+	  Enables AMD Pensando SoC controller device support.  This is a SPI
+	  attached companion device in all Pensando SoC board designs which
+	  provides essential board control/status registers and management IO
+	  support.
+endmenu

drivers/soc/amd/Makefile

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_AMD_PENSANDO_CTRL)	+= pensando-ctrl.o