根据dev_name 找到对应的驱动文件

开机的log中打印下面的log，那怎么根据这个log找到对应的驱动呢？
00:01: ttyS0 at MMIO 0x3f00002f8 (irq = 15, base_baud = 115200) is a 16550A
这段对应的源码如下：
static inline void
uart_report_port(struct uart_driver *drv, struct uart_port *port)
{
	char address[64];
	switch (port->iotype) {
	case UPIO_PORT:
		snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase);
		break;
	case UPIO_HUB6:
		snprintf(address, sizeof(address),
			 "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
		break;
	case UPIO_MEM:
	case UPIO_MEM16:
	case UPIO_MEM32:
	case UPIO_MEM32BE:
	case UPIO_AU:
	case UPIO_TSI:
		snprintf(address, sizeof(address),
			 "MMIO 0x%llx", (unsigned long long)port->mapbase);
		break;
	default:
		strlcpy(address, "*unknown*", sizeof(address));
		break;
	}
#可以知道这里的00:01 对应的是dev_name
	pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n",
	       port->dev ? dev_name(port->dev) : "",
	       port->dev ? ": " : "",
	       port->name,
	       address, port->irq, port->uartclk / 16, uart_type(port));
}

那么我们在/sys/devices 中找到对应的devname 如下：
[root@localhost ~]# cat /sys/devices/pnp0/
00:00/  00:01/  power/  uevent
[root@localhost 00:01]# ls
driver  firmware_node  id  options  power  resources  subsystem  tty  uevent
[root@localhost 00:01]# cat resources
state = active
mem 0x3f00002f8-0x3f00002ff
irq 15
在结合makefile可以知道用的驱动是8250_pnp.c