#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/of.h>
//设备节点类型
static struct device_node *devnode;
//节点属性类型
static struct property *prop;
static int len = 0;
static u32 value[2];
static const char *str;
static int __init test_init(void)
{
int ret = 0;
printk("test_init.....\n");
//根据节点路径寻找节点函数
devnode = of_find_node_by_path("/test1");
if (NULL == devnode)
{
printk("of_find_node_by_path failed....\n");
return 1;
}
printk("name: %s full_name: %s\n", devnode->name, devnode->full_name);
//获取节点属性
prop = of_find_property(devnode, "compatible", &len);
if (NULL == prop)
{
printk("of_find_property failed....\n");
return 1;
}
printk("property name: %s value: %s\n", prop->name, (char *)prop->value);
//获取reg的值
ret = of_property_read_u32_array(devnode, "reg", value, 2);
if (ret < 0)
{
printk("of_property_read_u32_array failed...\n");
return 1;
}
printk("value[0]: 0x%8x value[1]: 0x%8x\n", value[0], value[1]);
//获取status属性值
ret = of_property_read_string(devnode, "status", &str);
if (ret < 0)
{
printk("of_property_read_string failed....\n");
return 1;
}
printk("status = %s\n", str);
return 0;
}
static void __exit test_exit(void)
{
printk("test_exit......\n");
}
module_init(test_init);
module_exit(test_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jin.Deng");
MODULE_INFO(intree, "Y");
