RK3568-pinctrl子系统

pinctrl子系统

pinctrl子系统主要用于配置引脚复用，驱动强度，上下拉配置等。

驱动程序：/kernel/drivers/pinctrl/pinctrl-rockchip.c
	
rk3568.dtsi设备树配置：
pinctrl: pinctrl {
	compatible = "rockchip,rk3568-pinctrl";
	rockchip,grf = <&grf>;
	rockchip,pmu = <&pmugrf>;
	#address-cells = <2>;
	#size-cells = <2>;
	ranges;

	gpio0: gpio@fdd60000 {
		compatible = "rockchip,gpio-bank";
		reg = <0x0 0xfdd60000 0x0 0x100>;
		interrupts = ;
		clocks = <&pmucru PCLK_GPIO0>, <&pmucru DBCLK_GPIO0>;

		gpio-controller;
		#gpio-cells = <2>;
		gpio-ranges = <&pinctrl 0 0 32>;
		interrupt-controller;
		#interrupt-cells = <2>;
	};
};
	
板级文件设备树配置：
&pinctrl {
	key {
 		key_gpio: key-gpio {
 			rockchip,pins =
				<3 RK_PB6 RK_FUNC_GPIO &pcfg_pull_up>;