drivers: char: ipmi: Add Aspeed SSIF BMC driver

The SMBus system interface (SSIF) IPMI BMC driver can be used to perform
in-band IPMI communication with their host in management (BMC) side.

This commits adds support specifically for Aspeed AST2500 which commonly
used as Board Management Controllers.

Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>

drivers/char/ipmi/Kconfig

@@ -133,6 +133,28 @@ config ASPEED_BT_IPMI_BMC
 	  found on Aspeed SOCs (AST2400 and AST2500). The driver
 	  implements the BMC side of the BT interface.
 
+config SSIF_IPMI_BMC
+	tristate "SSIF IPMI BMC driver"
+	help
+	  This enables the IPMI SMBus system interface (SSIF) at the
+	  management (BMC) side.
+
+	  The driver implements the BMC side of the SMBus system
+	  interface (SSIF).
+
+config ASPEED_SSIF_IPMI_BMC
+	depends on ARCH_ASPEED || COMPILE_TEST
+	depends on I2C
+	select SSIF_IPMI_BMC
+	select I2C_SLAVE
+	tristate "Aspeed SSIF IPMI BMC driver"
+	help
+	  Provides a driver for the SSIF IPMI interface found on
+	  Aspeed AST2500 SoC.
+
+	  The driver implements the BMC side of the SMBus system
+	  interface (SSIF), specific for Aspeed AST2500 SoC.
+
 config IPMB_DEVICE_INTERFACE
 	tristate 'IPMB Interface handler'
 	depends on I2C

drivers/char/ipmi/Makefile

@@ -27,3 +27,5 @@ obj-$(CONFIG_ASPEED_BT_IPMI_BMC) += bt-bmc.o
 obj-$(CONFIG_ASPEED_KCS_IPMI_BMC) += kcs_bmc_aspeed.o
 obj-$(CONFIG_NPCM7XX_KCS_IPMI_BMC) += kcs_bmc_npcm7xx.o
 obj-$(CONFIG_IPMB_DEVICE_INTERFACE) += ipmb_dev_int.o
+obj-$(CONFIG_SSIF_IPMI_BMC) += ssif_bmc.o
+obj-$(CONFIG_ASPEED_SSIF_IPMI_BMC) += ssif_bmc_aspeed.o