centos man page for __root_device_register

__ROOT_DEVICE_REGIST(9) 				   Device drivers infrastructure				   __ROOT_DEVICE_REGIST(9)

NAME
       __root_device_register - allocate and register a root device

SYNOPSIS
       struct device * __root_device_register(const char * name, struct module * owner);

ARGUMENTS
       name
	   root device name

       owner
	   owner module of the root device, usually THIS_MODULE

DESCRIPTION
       This function allocates a root device and registers it using device_register. In order to free the returned device, use
       root_device_unregister.

       Root devices are dummy devices which allow other devices to be grouped under /sys/devices. Use this function to allocate a root device and
       then use it as the parent of any device which should appear under /sys/devices/{name}

       The /sys/devices/{name} directory will also contain a 'module' symlink which points to the owner directory in sysfs.

       Returns struct device pointer on success, or ERR_PTR on error.

NOTE
       You probably want to use root_device_register.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   __ROOT_DEVICE_REGIST(9)