diff --git a/drivers/clk/mediatek/clk-mux.c b/drivers/clk/mediatek/clk-mux.c
index cd5f9fd8cb98e..4421e48592576 100644
--- a/drivers/clk/mediatek/clk-mux.c
+++ b/drivers/clk/mediatek/clk-mux.c
@@ -4,6 +4,7 @@
  * Author: Owen Chen <owen.chen@mediatek.com>
  */
 
+#include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/compiler_types.h>
 #include <linux/container_of.h>
@@ -259,4 +260,41 @@ void mtk_clk_unregister_muxes(const struct mtk_mux *muxes, int num,
 }
 EXPORT_SYMBOL_GPL(mtk_clk_unregister_muxes);
 
+/*
+ * This clock notifier is called when the frequency of the parent
+ * PLL clock is to be changed. The idea is to switch the parent to a
+ * stable clock, such as the main oscillator, while the PLL frequency
+ * stabilizes.
+ */
+static int mtk_clk_mux_notifier_cb(struct notifier_block *nb,
+				   unsigned long event, void *_data)
+{
+	struct clk_notifier_data *data = _data;
+	struct clk_hw *hw = __clk_get_hw(data->clk);
+	struct mtk_mux_nb *mux_nb = to_mtk_mux_nb(nb);
+	int ret = 0;
+
+	switch (event) {
+	case PRE_RATE_CHANGE:
+		mux_nb->original_index = mux_nb->ops->get_parent(hw);
+		ret = mux_nb->ops->set_parent(hw, mux_nb->bypass_index);
+		break;
+	case POST_RATE_CHANGE:
+	case ABORT_RATE_CHANGE:
+		ret = mux_nb->ops->set_parent(hw, mux_nb->original_index);
+		break;
+	}
+
+	return notifier_from_errno(ret);
+}
+
+int devm_mtk_clk_mux_notifier_register(struct device *dev, struct clk *clk,
+				       struct mtk_mux_nb *mux_nb)
+{
+	mux_nb->nb.notifier_call = mtk_clk_mux_notifier_cb;
+
+	return devm_clk_notifier_register(dev, clk, &mux_nb->nb);
+}
+EXPORT_SYMBOL_GPL(devm_mtk_clk_mux_notifier_register);
+
 MODULE_LICENSE("GPL");
diff --git a/drivers/clk/mediatek/clk-mux.h b/drivers/clk/mediatek/clk-mux.h
index 6539c58f5d7df..83ff420f4ebe6 100644
--- a/drivers/clk/mediatek/clk-mux.h
+++ b/drivers/clk/mediatek/clk-mux.h
@@ -7,12 +7,14 @@
 #ifndef __DRV_CLK_MTK_MUX_H
 #define __DRV_CLK_MTK_MUX_H
 
+#include <linux/notifier.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 
 struct clk;
 struct clk_hw_onecell_data;
 struct clk_ops;
+struct device;
 struct device_node;
 
 struct mtk_mux {
@@ -89,4 +91,17 @@ int mtk_clk_register_muxes(const struct mtk_mux *muxes,
 void mtk_clk_unregister_muxes(const struct mtk_mux *muxes, int num,
 			      struct clk_hw_onecell_data *clk_data);
 
+struct mtk_mux_nb {
+	struct notifier_block	nb;
+	const struct clk_ops	*ops;
+
+	u8	bypass_index;	/* Which parent to temporarily use */
+	u8	original_index;	/* Set by notifier callback */
+};
+
+#define to_mtk_mux_nb(_nb)	container_of(_nb, struct mtk_mux_nb, nb)
+
+int devm_mtk_clk_mux_notifier_register(struct device *dev, struct clk *clk,
+				       struct mtk_mux_nb *mux_nb);
+
 #endif /* __DRV_CLK_MTK_MUX_H */