powerpc: ppc4xx: Add a gpio.h header file
This is required at present for device tree control. The ppc4xx does support
GPIOs but does not seem to have a proper driver. So this file is empty.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/powerpc/include/asm/arch-ppc4xx/gpio.h b/arch/powerpc/include/asm/arch-ppc4xx/gpio.h
new file mode 100644
index 0000000..3d960c3
--- /dev/null
+++ b/arch/powerpc/include/asm/arch-ppc4xx/gpio.h
@@ -0,0 +1,7 @@
+/*
+ * (C) Copyright 2014 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/* This is empty for now as we don't support the generic GPIO interface */