典型 ARM 设备的设备树源将包含中断 Controller 部分:
interrupt-controller@f8f01000 {
compatible = "arm,cortex-a9-gic";
#interrupt-cells = <0x3>;
interrupt-controller;
reg = <0xf8f01000 0x1000 0xf8f00100 0x100>;
num_cpus = <0x2>;
num_interrupts = <0x60>;
linux,phandle = <0x3>;
phandle = <0x3>;
};
属性(property)#interrupt-cells定义用于注册中断的元组的大小。因此，在定义设备时，必须定义三个整数来指定中断及其属性。
ocmc@f800c000 {
compatible = "xlnx,zynq-ocmc-1.0";
interrupt-parent = <0x3>;
interrupts = <0x0 0x3 0x4>;
reg = <0xf800c000 0x1000>;
};
问题是，这三个值分别代表什么？那么，interrupts = <0x0 0x3 0x4>; 行是什么意思？意思是？以及在为其注册中断处理程序时必须添加什么偏移量(通过 signal.h/csignal 和 signal(<signal id>, <function name>); )
最佳答案
从链接的网站解析:
The first number is a flag indicating if the interrupt is an SPI (shared peripheral interrupt). A nonzero value means it is an SPI. This impacts offsets added to translate the interrupt number (16 for SPI, 32 for non-SPI).
The second number is the interrupt number.
The third number is the type of interrupt: 0 = Leave it as it was (power-up default or what the bootloader set it to, if it did). 1 = Rising edge. 4 = Level sensitive, active high.
关于c - ARM设备树文件中，三个中断值是什么意思，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48188392/