ACPI 启动下platform_driver定义时是否要用of_match_ptr

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一般驱动要同时兼容dt和acpi的话，需要在定义platform_driver的时候同时指定of_match_table和acpi_match_table
static struct platform_driver hns_nic_dev_driver = {
   .driver = {
       .name = "hns-nic",
       .of_match_table = hns_enet_of_match,
       .acpi_match_table = ACPI_PTR(hns_enet_acpi_match),
   },
   .probe = hns_nic_dev_probe,
   .remove = hns_nic_dev_remove,
};

但是这段code，其实按照下面的写法会更好
static struct platform_driver hns_nic_dev_driver = {
   .driver = {
       .name = "hns-nic",
       .of_match_table = of_match_ptr(hns_enet_of_match),
       .acpi_match_table = ACPI_PTR(hns_enet_acpi_match),
   },
   .probe = hns_nic_dev_probe,
   .remove = hns_nic_dev_remove,
};

即和ACPI_PTR对应的是of_match_ptr
#ifdef CONFIG_OF
#define of_match_ptr(_ptr)   (_ptr)
#else
#define of_match_ptr(_ptr)   (null)
#endif

同样ACPI_PTR的定义如下：
#ifdef CONFIG_ACPI
#define ACPI_PTR(_ptr)   (_ptr)
#else
#define of_match_ptr(_ptr)   (null)
#endif

但是现实情况是CONFIG_ACPI和CONFIG_OF 会同时定义，因为ACPI启动下需要通过dt来得到systab.

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