diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 3c1fbdc92468..6c62af108710 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -966,6 +966,33 @@ void omap_mcbsp_stop(unsigned int id, int tx, int rx)
 }
 EXPORT_SYMBOL(omap_mcbsp_stop);
 
+/*
+ * The following functions are only required on an OMAP1-only build.
+ * mach-omap2/mcbsp.c contains the real functions
+ */
+#ifndef CONFIG_ARCH_OMAP2PLUS
+int omap2_mcbsp_set_clks_src(u8 id, u8 fck_src_id)
+{
+	WARN(1, "%s: should never be called on an OMAP1-only kernel\n",
+	     __func__);
+	return -EINVAL;
+}
+
+void omap2_mcbsp1_mux_clkr_src(u8 mux)
+{
+	WARN(1, "%s: should never be called on an OMAP1-only kernel\n",
+	     __func__);
+	return;
+}
+
+void omap2_mcbsp1_mux_fsr_src(u8 mux)
+{
+	WARN(1, "%s: should never be called on an OMAP1-only kernel\n",
+	     __func__);
+	return;
+}
+#endif
+
 #ifdef CONFIG_ARCH_OMAP3
 #define max_thres(m)			(mcbsp->pdata->buffer_size)
 #define valid_threshold(m, val)		((val) <= max_thres(m))