misc: Add IHS FPGA driver

Add a driver for gdsys IHS (Integrated Hardware Systems) FPGAs, which
supports initialization of the FPGA, as well as information gathering.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index d589f32..48febc4 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -320,4 +320,13 @@
 	  IHS (Integrated Hardware Systems) FPGA, which holds all devices whose
 	  register maps are contained within the FPGA's register map.
 
+config IHS_FPGA
+	bool "Enable IHS FPGA driver"
+	depends on MISC
+	help
+	  Support IHS (Integrated Hardware Systems) FPGA, the main FPGAs on
+	  gdsys devices, which supply the majority of the functionality offered
+	  by the devices. This driver supports both CON and CPU variants of the
+	  devices, depending on the device tree entry.
+
 endmenu