[Intel-gfx] [PATCH 13/19] drm/i915: Document that the pll->mode_set hook is optional

[Imre Deak]

From: Daniel Vetter <daniel.vetter at ffwll.ch>

The WRPLLs won't use them.

Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
Reviewed-by: Damien Lespiau <damien.lespiau at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7b0cbe4..650a5ad 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -206,6 +206,8 @@ struct intel_shared_dpll {
 	/* should match the index in the dev_priv->shared_dplls array */
 	enum intel_dpll_id id;
 	struct intel_dpll_hw_state hw_state;
+	/* The mode_set hook is optional and should be used together with the
+	 * intel_prepare_shared_dpll function. */
 	void (*mode_set)(struct drm_i915_private *dev_priv,
 			 struct intel_shared_dpll *pll);
 	void (*enable)(struct drm_i915_private *dev_priv,
-- 
1.8.4