diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
index 76d14486b3a5..2d47f1f756a2 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
@@ -4408,6 +4408,13 @@ void intel_update_active_dpll(struct intel_atomic_state *state,
 	dpll_mgr->update_active_dpll(state, crtc, encoder);
 }
 
+/**
+ * intel_dpll_get_freq - calculate the DPLL's output frequency
+ * @i915: i915 device
+ * @pll: DPLL for which to calculate the output frequency
+ *
+ * Return the output frequency corresponding to @pll's current state.
+ */
 int intel_dpll_get_freq(struct drm_i915_private *i915,
 			const struct intel_shared_dpll *pll)
 {
diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
index 5c847627580a..5d9a2bc371e7 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
@@ -279,6 +279,12 @@ struct intel_shared_dpll_funcs {
 			     struct intel_shared_dpll *pll,
 			     struct intel_dpll_hw_state *hw_state);
 
+	/**
+	 * @get_freq:
+	 *
+	 * Hook for calculating the pll's output frequency based on its
+	 * current state.
+	 */
 	int (*get_freq)(struct drm_i915_private *i915,
 			const struct intel_shared_dpll *pll);
 };