diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 3f6ea4d..765499d 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -13,6 +13,7 @@
 #include <serial.h>
 #include <watchdog.h>
 #include <linux/types.h>
+#include <linux/compiler.h>
 #include <asm/io.h>
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -353,8 +354,8 @@
 {
 	struct ns16550_platdata *plat = dev->platdata;
 	fdt_addr_t addr;
-	struct clk clk;
-	int err;
+	__maybe_unused struct clk clk;
+	__maybe_unused int err;
 
 	/* try Processor Local Bus device first */
 	addr = dev_get_addr(dev);
@@ -401,6 +402,7 @@
 	plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
 					 "reg-shift", 0);
 
+#ifdef CONFIG_CLK
 	err = clk_get_by_index(dev, 0, &clk);
 	if (!err) {
 		err = clk_get_rate(&clk);
@@ -410,6 +412,7 @@
 		debug("ns16550 failed to get clock\n");
 		return err;
 	}
+#endif
 
 	if (!plat->clock)
 		plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
diff --git a/include/clk.h b/include/clk.h
index 94c0037..7273127 100644
--- a/include/clk.h
+++ b/include/clk.h
@@ -98,19 +98,6 @@
  * @return 0 if OK, or a negative error code.
  */
 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk);
-#else
-static inline int clk_get_by_index(struct udevice *dev, int index,
-				   struct clk *clk)
-{
-	return -ENOSYS;
-}
-
-static inline int clk_get_by_name(struct udevice *dev, const char *name,
-			   struct clk *clk)
-{
-	return -ENOSYS;
-}
-#endif
 
 /**
  * clk_request - Request a clock by provider-specific ID.
@@ -175,5 +162,17 @@
 int clk_disable(struct clk *clk);
 
 int soc_clk_dump(void);
+#else
+static inline int clk_get_by_index(struct udevice *dev, int index,
+				   struct clk *clk)
+{
+	return -ENOSYS;
+}
 
+static inline int clk_get_by_name(struct udevice *dev, const char *name,
+			   struct clk *clk)
+{
+	return -ENOSYS;
+}
+#endif
 #endif