内核报错信息查看

include/uapi/asm-generic/errno-base.h                        

设备树的读取操作

    struct device_node *nc
    of_property_read_bool(nc, "spi-cpha")
    if (!of_node_name_eq(nc, "slave"))
    rc = of_property_read_u32(nc, "reg", &value);
    if (!of_property_read_u32(nc, "spi-max-frequency", &value))

 获取字符串：

    //dts
    spi-product = "rtk8370";
    // c
     ret = of_property_read_string_array(spi->dev.of_node, "spi-product", spiProduct, 1);
     printk("#### zkwlfile:%s func:%s line:%d ret:%d spiProduct->%s \n",                 
             __FILE__, __func__, __LINE__, ret, spiProduct[0]);          

 linux符号操作

用于设置全局变量操作

https://blog.csdn.net/u010798513/article/details/144257206https://blog.csdn.net/u010798513/article/details/144257206