[Intel-gfx] [PATCH 3/3] drm/i915: add DOC for i915_component

[libin.yang at intel.com]

From: Libin Yang <libin.yang at intel.com>

Add the DOC for i915_component.h. Explain the struct
i915_audio_component_ops and struct i915_audio_component_audio_ops
usage.

Signed-off-by: Libin Yang <libin.yang at intel.com>
---
 drivers/gpu/drm/i915/intel_audio.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
index 72d696b..56c2f54 100644
--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -50,6 +50,11 @@
  * co-operation between the graphics and audio drivers is handled via audio
  * related registers. (The notable exception is the power management, not
  * covered here.)
+ *
+ * The struct i915_audio_component is used to interact between the graphics
+ * and audio drivers. The struct i915_audio_component_ops *ops in it is
+ * defined in graphics driver and called in audio driver. The
+ * struct i915_audio_component_audio_ops *audio_ops is called from i915 driver.
  */
 
 static const struct {
-- 
1.9.1