lnux内核初始化设备

以PXA2XX处理器为例
linux用platform_device 结构体来描述"虚拟总线platform"设备:
struct platform_device {
const char * name;
u32 id;
struct device dev;
u32 num_resources;
struct resource * resource;
};

比如mainstone.c中网卡的platform_device
static struct platform_device smc91x_device = {
    .name        = "smc91x",
    .id        = 0,
    .num_resources    = ARRAY_SIZE(smc91x_resources),
    .resource    = smc91x_resources,
};

generic.c中初始化devices数组
static struct platform_device *devices[] __initdata = {
    &pxamci_device,
    &udc_device,
    &pxafb_device,
    &ffuart_device,
    &btuart_device,
    &stuart_device,
};

内核初始化时调用platform_add_devices。
static int __init pxa_init(void)
{
    return platform_add_devices(devices, ARRAY_SIZE(devices));
}
ARRAY_SIZE(devices)获得devices数组的大小，platform_add_devices遍历数组中的devices结构指针来添加设备。