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-rw-r--r--include/drm/drm_property.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/include/drm/drm_property.h b/include/drm/drm_property.h
index bbf5c1fdd7b0..65bc9710a470 100644
--- a/include/drm/drm_property.h
+++ b/include/drm/drm_property.h
@@ -31,7 +31,6 @@
/**
* struct drm_property_enum - symbolic values for enumerations
- * @value: numeric property value for this enum entry
* @head: list of enum values, linked to &drm_property.enum_list
* @name: symbolic name for the enum
*
@@ -39,6 +38,14 @@
* decoding for each value. This is used for example for the rotation property.
*/
struct drm_property_enum {
+ /**
+ * @value: numeric property value for this enum entry
+ *
+ * If the property has the type &DRM_MODE_PROP_BITMASK, @value stores a
+ * bitshift, not a bitmask. In other words, the enum entry is enabled
+ * if the bit number @value is set in the property's value. This enum
+ * entry has the bitmask ``1 << value``.
+ */
uint64_t value;
struct list_head head;
char name[DRM_PROP_NAME_LEN];