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static struct resource s3c_rtc_resource[] = {
[0] = {
.start = S3C2410_PA_RTC, //IO设备的物理地址
.end   = S3C2410_PA_RTC + 0xff,
.flags = IORESOURCE_MEM,
},

[1] = {
.start = IRQ_RTC,
.end   = IRQ_RTC,
.flags = IORESOURCE_IRQ,
},
[2] = {
.start = IRQ_TICK,
.end   = IRQ_TICK,
.flags = IORESOURCE_IRQ
}
};

struct resource *platform_get_resource(struct platform_device *dev, unsigned int type,unsigned int num)
{
int i;
for (i = 0; i < dev->num_resources; i++)  //num_resource 的个数
{
struct resource *r = &dev->resource; //resource应该s3c2410_rtc_resource是通过下标来对resource赋值

if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM|IORESOURCE_IRQ|IORESOURCE_DMA))== type)
if (num-- == 0)
return r;
}
return NULL;
}

s3c2410_rtc_tickno =IRQ_TICK
s3c2410_rtc_alarmno= IRQ_RTC

int platform_get_irq(struct platform_device *dev, unsigned int num)
{
struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
return r ? r->start : 0;
}