6.2设备树中时钟的使用

 

 

s3c2440.dtsi

xti: xti_clock {
		compatible = "fixed-clock";
		clock-frequency = <12000000>;//晶振
		clock-output-names = "xti";
		#clock-cells = <0>;
	};

	clocks: [e-mail] {
		compatible = "samsung,s3c2440-clock";
		reg = <0x4c000000 0x20>;//时钟控制寄存器
		#clock-cells = <1>;
	};

文档:
内核 Documentation/devicetree/bindings/clock/clock-bindings.txt
内核 Documentation/devicetree/bindings/clock/samsung,s3c2410-clock.txt

a. 设备树中定义了各种时钟, 在文档中称之为"Clock providers", 比如:
clocks: [e-mail] {
compatible = “samsung,s3c2440-clock”;
reg = <0x4c000000 0x20>;
#clock-cells = <1>; /