fpga: region: add fpga-region.h header

* Create fpga-region.h.
* Export fpga_region_program_fpga.
* Move struct fpga_region and other things to the header.

This is a step in separating FPGA region common code
from Device Tree support.

Signed-off-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/fpga/fpga-region.h

@@ -0,0 +1,28 @@
+#ifndef _FPGA_REGION_H
+#define _FPGA_REGION_H
+
+#include <linux/device.h>
+#include <linux/fpga/fpga-mgr.h>
+#include <linux/fpga/fpga-bridge.h>
+
+/**
+ * struct fpga_region - FPGA Region structure
+ * @dev: FPGA Region device
+ * @mutex: enforces exclusive reference to region
+ * @bridge_list: list of FPGA bridges specified in region
+ * @mgr: FPGA manager
+ * @info: FPGA image info
+ */
+struct fpga_region {
+	struct device dev;
+	struct mutex mutex; /* for exclusive reference to region */
+	struct list_head bridge_list;
+	struct fpga_manager *mgr;
+	struct fpga_image_info *info;
+};
+
+#define to_fpga_region(d) container_of(d, struct fpga_region, dev)
+
+int fpga_region_program_fpga(struct fpga_region *region);
+
+#endif /* _FPGA_REGION_H */