1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c
index 20bdc52f63a5..a461095efd8a 100644
--- a/drivers/dpll/dpll_core.c
+++ b/drivers/dpll/dpll_core.c
@@ -506,6 +506,7 @@ dpll_pin_alloc(u64 clock_id, u32 pin_idx, struct module *module,
 	refcount_set(&pin->refcount, 1);
 	xa_init_flags(&pin->dpll_refs, XA_FLAGS_ALLOC);
 	xa_init_flags(&pin->parent_refs, XA_FLAGS_ALLOC);
+	xa_init_flags(&pin->ref_sync_pins, XA_FLAGS_ALLOC);
 	ret = xa_alloc_cyclic(&dpll_pin_xa, &pin->id, pin, xa_limit_32b,
 			      &dpll_pin_xa_id, GFP_KERNEL);
 	if (ret < 0)
@@ -514,6 +515,7 @@ dpll_pin_alloc(u64 clock_id, u32 pin_idx, struct module *module,
 err_xa_alloc:
 	xa_destroy(&pin->dpll_refs);
 	xa_destroy(&pin->parent_refs);
+	xa_destroy(&pin->ref_sync_pins);
 	dpll_pin_prop_free(&pin->prop);
 err_pin_prop:
 	kfree(pin);
@@ -595,6 +597,7 @@ void dpll_pin_put(struct dpll_pin *pin)
 		xa_erase(&dpll_pin_xa, pin->id);
 		xa_destroy(&pin->dpll_refs);
 		xa_destroy(&pin->parent_refs);
+		xa_destroy(&pin->ref_sync_pins);
 		dpll_pin_prop_free(&pin->prop);
 		kfree_rcu(pin, rcu);
 	}
@@ -659,11 +662,26 @@ dpll_pin_register(struct dpll_device *dpll, struct dpll_pin *pin,
 }
 EXPORT_SYMBOL_GPL(dpll_pin_register);
 
+static void dpll_pin_ref_sync_pair_del(u32 ref_sync_pin_id)
+{
+	struct dpll_pin *pin, *ref_sync_pin;
+	unsigned long i;
+
+	xa_for_each(&dpll_pin_xa, i, pin) {
+		ref_sync_pin = xa_load(&pin->ref_sync_pins, ref_sync_pin_id);
+		if (ref_sync_pin) {
+			xa_erase(&pin->ref_sync_pins, ref_sync_pin_id);
+			__dpll_pin_change_ntf(pin);
+		}
+	}
+}
+
 static void
 __dpll_pin_unregister(struct dpll_device *dpll, struct dpll_pin *pin,
 		      const struct dpll_pin_ops *ops, void *priv, void *cookie)
 {
 	ASSERT_DPLL_PIN_REGISTERED(pin);
+	dpll_pin_ref_sync_pair_del(pin->id);
 	dpll_xa_ref_pin_del(&dpll->pin_refs, pin, ops, priv, cookie);
 	dpll_xa_ref_dpll_del(&pin->dpll_refs, dpll, ops, priv, cookie);
 	if (xa_empty(&pin->dpll_refs))
@@ -783,6 +801,33 @@ void dpll_pin_on_pin_unregister(struct dpll_pin *parent, struct dpll_pin *pin,
 }
 EXPORT_SYMBOL_GPL(dpll_pin_on_pin_unregister);
 
+/**
+ * dpll_pin_ref_sync_pair_add - create a reference sync signal pin pair
+ * @pin: pin which produces the base frequency
+ * @ref_sync_pin: pin which produces the sync signal
+ *
+ * Once pins are paired, the user-space configuration of reference sync pair
+ * is possible.
+ * Context: Acquires a lock (dpll_lock)
+ * Return:
+ * * 0 on success
+ * * negative - error value
+ */
+int dpll_pin_ref_sync_pair_add(struct dpll_pin *pin,
+			       struct dpll_pin *ref_sync_pin)
+{
+	int ret;
+
+	mutex_lock(&dpll_lock);
+	ret = xa_insert(&pin->ref_sync_pins, ref_sync_pin->id,
+			ref_sync_pin, GFP_KERNEL);
+	__dpll_pin_change_ntf(pin);
+	mutex_unlock(&dpll_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dpll_pin_ref_sync_pair_add);
+
 static struct dpll_device_registration *
 dpll_device_registration_first(struct dpll_device *dpll)
 {