drm: Document that drm_dev_alloc doesn't need a parent
Possible for purely virtual debug devices. Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -535,6 +535,8 @@ static void drm_fs_inode_free(struct inode *inode)
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* The initial ref-count of the object is 1. Use drm_dev_ref() and
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* drm_dev_unref() to take and drop further ref-counts.
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*
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* Note that for purely virtual devices @parent can be NULL.
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*
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* RETURNS:
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* Pointer to new DRM device, or NULL if out of memory.
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*/
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