rockchip: rk3368: Add pinctrl driver

Add driver to support iomux setup for the most commonly
used peripherals on rk3368.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index f6616c5..79249e0 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -197,6 +197,16 @@
 	  the GPIO definitions and pin control functions for each available
 	  multiplex function.
 
+config PINCTRL_ROCKCHIP_RK3368
+	bool "Rockchip RK3368 pin control driver"
+	depends on DM
+	help
+	  Support pin multiplexing control on Rockchip rk3368 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 PINCTRL_ROCKCHIP_RK3399
 	bool "Rockchip rk3399 pin control driver"
 	depends on DM