rockchip: rk322x: add pinctrl driver

Add init pinctrl driver support for:
- i2c;
- spi;
- uart;
- pwm;
- emmc/sdmmc;

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index f948783..4ab0b3a 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -178,6 +178,16 @@
 	  the GPIO definitions and pin control functions for each available
 	  multiplex function.
 
+config PINCTRL_ROCKCHIP_RK322X
+	bool "Rockchip rk322x pin control driver"
+	depends on DM
+	help
+	  Support pin multiplexing control on Rockchip rk322x 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_RK3288
 	bool "Rockchip rk3288 pin control driver"
 	depends on DM