drivers: misc: add Gateworks System Controller driver

Add a driver for the Gateworks System Controller used on Gateworks boards
which provides a boot watchdog, power control, temperature monitor,
and voltage ADCs.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 7029bb7..10fd601 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -46,6 +46,14 @@
 	   CryptoAuthentication module found for example on the Turris Omnia
 	   board.
 
+config GATEWORKS_SC
+	bool "Gateworks System Controller Support"
+	depends on MISC
+	help
+	  Enable access for the Gateworks System Controller used on Gateworks
+	  boards to provide a boot watchdog, power control, temperature monitor,
+	  voltage ADCs, and EEPROM.
+
 config ROCKCHIP_EFUSE
         bool "Rockchip e-fuse support"
 	depends on MISC