drm/doc: Add GEM/CMA helpers to kerneldoc

Most of the functions already have the beginnings of kerneldoc comments
but are using the wrong opening marker. Use the correct opening marker
and flesh out the comments so that they can be integrated with the DRM
DocBook document.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thierry Reding <treding@nvidia.com>

Documentation/DocBook/drm.tmpl

@@ -963,6 +963,12 @@ struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
 !Edrivers/gpu/drm/drm_mm.c
 !Iinclude/drm/drm_mm.h
     </sect2>
+    <sect2>
+      <title>CMA Helper Functions Reference</title>
+!Pdrivers/gpu/drm/drm_gem_cma_helper.c cma helpers
+!Edrivers/gpu/drm/drm_gem_cma_helper.c
+!Iinclude/drm/drm_gem_cma_helper.h
+    </sect2>
   </sect1>
 
   <!-- Internals: mode setting -->

include/drm/drm_gem_cma_helper.h

@@ -4,6 +4,13 @@
 #include <drm/drmP.h>
 #include <drm/drm_gem.h>
 
+/**
+ * struct drm_gem_cma_object - GEM object backed by CMA memory allocations
+ * @base: base GEM object
+ * @paddr: physical address of the backing memory
+ * @sgt: scatter/gather table for imported PRIME buffers
+ * @vaddr: kernel virtual address of the backing memory
+ */
 struct drm_gem_cma_object {
 	struct drm_gem_object base;
 	dma_addr_t paddr;
@@ -19,23 +26,25 @@ to_drm_gem_cma_obj(struct drm_gem_object *gem_obj)
 	return container_of(gem_obj, struct drm_gem_cma_object, base);
 }
 
-/* free gem object. */
+/* free GEM object */
 void drm_gem_cma_free_object(struct drm_gem_object *gem_obj);
 
-/* create memory region for drm framebuffer. */
+/* create memory region for DRM framebuffer */
 int drm_gem_cma_dumb_create(struct drm_file *file_priv,
-		struct drm_device *drm, struct drm_mode_create_dumb *args);
+			    struct drm_device *drm,
+			    struct drm_mode_create_dumb *args);
 
-/* map memory region for drm framebuffer to user space. */
+/* map memory region for DRM framebuffer to user space */
 int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv,
-		struct drm_device *drm, uint32_t handle, uint64_t *offset);
+				struct drm_device *drm, u32 handle,
+				u64 *offset);
 
-/* set vm_flags and we can change the vm attribute to other one at here. */
+/* set vm_flags and we can change the VM attribute to other one at here */
 int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma);
 
-/* allocate physical memory. */
+/* allocate physical memory */
 struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
-		unsigned int size);
+					      size_t size);
 
 extern const struct vm_operations_struct drm_gem_cma_vm_ops;