CREG GPIO: add device tree bindings

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index fe84235..1bd583c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -74,6 +74,7 @@
 M:	Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
 S:	Maintained
 L:	uboot-snps-arc@synopsys.com
+F:	doc/device-tree-bindings/gpio/snps,creg-gpio.txt
 F:	drivers/gpio/hsdk-creg-gpio.c
 
 ARM