platform/x86: Add Silicom Platform Driver

Add Silicom platform (silicom-platform) Linux driver for Swisscom
Business Box (Swisscom BB) as well as Cordoba family products.

This platform driver provides support for various functions via
the Linux LED framework, GPIO framework, Hardware Monitoring (HWMON)
and device attributes.
Signed-off-by: Henry Shi <henryshi2018@gmail.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20231124200334.5318-1-henryshi2018@gmail.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>

Documentation/ABI/testing/sysfs-platform-silicom

+What:		/sys/devices/platform/silicom-platform/uc_version
+Date:		November 2023
+KernelVersion:	6.7
+Contact:	Henry Shi <henrys@silicom-usa.com>
+Description:
+		This file allows to read microcontroller firmware
+		version of current platform.
+
+What:		/sys/devices/platform/silicom-platform/power_cycle
+Date:		November 2023
+KernelVersion:	6.7
+Contact:	Henry Shi <henrys@silicom-usa.com>
+		This file allow user to power cycle the platform.
+		Default value is 0; when set to 1, it powers down
+		the platform, waits 5 seconds, then powers on the
+		device. It returns to default value after power cycle.
+
+		0 - default value.
+
+What:		/sys/devices/platform/silicom-platform/efuse_status
+Date:		November 2023
+KernelVersion:	6.7
+Contact:	Henry Shi <henrys@silicom-usa.com>
+Description:
+		This file is read only. It returns the current
+		OTP status:
+
+		0 - not programmed.
+		1 - programmed.

drivers/platform/x86/Kconfig

@@ -1089,6 +1089,21 @@ config INTEL_SCU_IPC_UTIL
 
 source "drivers/platform/x86/siemens/Kconfig"
 
+config SILICOM_PLATFORM
+	tristate "Silicom Edge Networking device support"
+	depends on HWMON
+	depends on GPIOLIB
+	depends on LEDS_CLASS_MULTICOLOR
+	help
+	  This option enables support for the LEDs/GPIO/etc downstream of the
+	  embedded controller on Silicom "Cordoba" hardware and derivatives.
+
+	  This platform driver provides support for various functions via
+	  the Linux LED framework, GPIO framework, Hardware Monitoring (HWMON)
+	  and device attributes.
+
+	  If you have a Silicom network appliance, say Y or M here.
+
 config WINMATE_FM07_KEYS
 	tristate "Winmate FM07/FM07P front-panel keys driver"
 	depends on INPUT

drivers/platform/x86/Makefile

@@ -136,6 +136,9 @@ obj-$(CONFIG_X86_INTEL_LPSS)		+= pmc_atom.o
 # Siemens Simatic Industrial PCs
 obj-$(CONFIG_SIEMENS_SIMATIC_IPC)	+= siemens/
 
+# Silicom
+obj-$(CONFIG_SILICOM_PLATFORM)		+= silicom-platform.o
+
 # Winmate
 obj-$(CONFIG_WINMATE_FM07_KEYS)		+= winmate-fm07-keys.o