aspeed: AST2500 Pinctrl Driver

This driver uses Generic Pinctrl framework and is compatible with
the Linux driver for ast2500: it uses the same device tree
configuration.

Not all pins are supported by the driver at the moment, so it actually
compatible with ast2400. In general, however, there are differences that
in the future would be easier to maintain separately.

Signed-off-by: Maxim Sloyko <maxims@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 9cea6f2..f6616c5 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -248,6 +248,15 @@
 	  the GPIO definitions and pin control functions for each available
 	  multiplex function.
 
+config ASPEED_AST2500_PINCTRL
+  bool "Aspeed AST2500 pin control driver"
+  depends on DM && PINCTRL_GENERIC && ASPEED_AST2500
+  default y
+  help
+    Support pin multiplexing control on Aspeed ast2500 SoC. The driver uses
+	Generic Pinctrl framework and is compatible with the Linux driver,
+	i.e. it uses the same device tree configuration.
+
 endif
 
 source "drivers/pinctrl/meson/Kconfig"