diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
index 25b1734..614444c 100644
--- a/drivers/clk/clk-mux.c
+++ b/drivers/clk/clk-mux.c
@@ -86,8 +86,12 @@
 	if (mux->lock)
 		spin_lock_irqsave(mux->lock, flags);
 
-	val = readl(mux->reg);
-	val &= ~(mux->mask << mux->shift);
+	if (mux->flags & CLK_MUX_HIWORD_MASK) {
+		val = mux->mask << (mux->shift + 16);
+	} else {
+		val = readl(mux->reg);
+		val &= ~(mux->mask << mux->shift);
+	}
 	val |= index << mux->shift;
 	writel(val, mux->reg);
 
@@ -111,6 +115,15 @@
 	struct clk_mux *mux;
 	struct clk *clk;
 	struct clk_init_data init;
+	u8 width = 0;
+
+	if (clk_mux_flags & CLK_MUX_HIWORD_MASK) {
+		width = fls(mask) - ffs(mask) + 1;
+		if (width + shift > 16) {
+			pr_err("mux value exceeds LOWORD field\n");
+			return ERR_PTR(-EINVAL);
+		}
+	}
 
 	/* allocate the mux */
 	mux = kzalloc(sizeof(struct clk_mux), GFP_KERNEL);