RK3568技术笔记十八 Linux GPIO驱动程序中设备树分析

这段代码是RK3568芯片的设备树（Device Tree）片段，用于描述GPIO控制器的配置。

pinctrl: pinctrl {

compatible = "rockchip,rk3568-pinctrl"; // 兼容性字符串，指定此设备树节点适用于RK3568的引脚控制器

rockchip,grf = <&grf>; // 引用通用寄存器（GRF）

rockchip,pmu = <&pmugrf>; // 引用GPIO控制寄存器

#address-cells = <2>; // 指定地址长度的位数为32x2，也就是64位地址

#size-cells = <2>; // 指定每个地址的长度是32x2，也就是64位长度

ranges; // 指定地址映射范围

gpio0: gpio@fdd60000 { // GPIO控制器0的描述，0xfdd60000是GPIO0的起始地址，这是从RK3568TRM里面截图出来的信息，一一对应了。

compatible = "rockchip,gpio-bank"; // 兼容性字符串，指定这是Rockchip GPIO控制器，为了通配GPIO

reg = <0x0 0xfdd60000 0x0 0x100>; // 寄存器地址和大小

interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>; // 中断配置

clocks = <&pmucru PCLK_GPIO0>, <&pmucru DBCLK_GPIO0>; // 时钟源配置

gpio-controller; // 标识这是一个GPIO控制器

#gpio-cells = <2>; // 每个GPIO单元的属性位数（标识和偏移）

gpio-ranges = <&pinctrl 0 0 32>; // GPIO范围配置

interrupt-controller; // 标识这是一个中断控制器

#interrupt-cells = <2>; // 每个中断单元的属性位数

};

cpp 复制代码

gpio1: gpio@fe740000 {
		compatible = "rockchip,gpio-bank";
		reg = <0x0 0xfe740000 0x0 0x100>;
		interrupts = <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
		clocks = <&cru PCLK_GPIO1>, <&cru DBCLK_GPIO1>;

		gpio-controller;
		#gpio-cells = <2>;
		gpio-ranges = <&pinctrl 0 32 32>;
		interrupt-controller;
		#interrupt-cells = <2>;
	};

	gpio2: gpio@fe750000 {
		compatible = "rockchip,gpio-bank";
		reg = <0x0 0xfe750000 0x0 0x100>;
		interrupts = <GIC_SPI 35 IRQ_TYPE_LEVEL_HIGH>;
		clocks = <&cru PCLK_GPIO2>, <&cru DBCLK_GPIO2>;

		gpio-controller;
		#gpio-cells = <2>;
		gpio-ranges = <&pinctrl 0 64 32>;
		interrupt-controller;
		#interrupt-cells = <2>;
	};

	gpio3: gpio@fe760000 {
		compatible = "rockchip,gpio-bank";
		reg = <0x0 0xfe760000 0x0 0x100>;
		interrupts = <GIC_SPI 36 IRQ_TYPE_LEVEL_HIGH>;
		clocks = <&cru PCLK_GPIO3>, <&cru DBCLK_GPIO3>;

		gpio-controller;
		#gpio-cells = <2>;
		gpio-ranges = <&pinctrl 0 96 32>;
		interrupt-controller;
		#interrupt-cells = <2>;
	};