drivers: pinctrl: Add simple pinctrl driver for Qualcomm/Atheros ar933x.

This is a simple pinctrl driver, it just support uart and spi pin-mux now.

Signed-off-by: Wills Wang <wills.wang@live.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
[fixed typo in commit subject line]
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 2a69bab..854d5a5 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -105,6 +105,15 @@
 
 if PINCTRL || SPL_PINCTRL
 
+config AR933X_PINCTRL
+	bool "QCA/Athores ar933x pin control driver"
+	depends on DM && SOC_AR933X
+	help
+	  Support pin multiplexing control on QCA/Athores ar933x SoCs.
+	  The driver is controlled by a device tree node which contains
+	  both the GPIO definitions and pin control functions for each
+	  available multiplex function.
+
 config ROCKCHIP_PINCTRL
 	bool "Rockchip pin control driver"
 	depends on DM