v4.19.13 snapshot.
diff --git a/arch/arm/mach-iop13xx/msi.h b/arch/arm/mach-iop13xx/msi.h
new file mode 100644
index 0000000..766dcfa
--- /dev/null
+++ b/arch/arm/mach-iop13xx/msi.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _IOP13XX_MSI_H_
+#define _IOP13XX_MSI_H_
+#ifdef CONFIG_PCI_MSI
+void iop13xx_msi_init(void);
+#else
+static inline void iop13xx_msi_init(void)
+{
+	return;
+}
+#endif
+#endif