00/11] Device Tree support for FPGA Programming

index ce3e84f..d056d69 100644
@@ -38,11 +38,13 @@ To get/put a reference to a FPGA manager:
 -----------------------------------------
 
 	struct fpga_manager *of_fpga_mgr_get(struct device_node *node);
+	struct fpga_manager *fpga_mgr_get(struct device *dev);
+
+Given a DT node or device, get an exclusive reference to a FPGA manager.
 
 	void fpga_mgr_put(struct fpga_manager *mgr);
 
-Given a DT node, get an exclusive reference to a FPGA manager or release
-the reference.
+Release the reference.
 
 
 To register or unregister the low level FPGA-specific driver:

new file mode 100644
index 0000000..312ae2c
@@ -0,0 +1,11 @@
+What:		/sys/class/fpga_bridge/<bridge>/name
+Date:		January 2016
+KernelVersion:	4.5
+Contact:	Alan Tull <[email protected]>
+Description:	Name of low level FPGA bridge driver.
+
+What:		/sys/class/fpga_bridge/<bridge>/state
+Date:		January 2016
+KernelVersion:	4.5
+Contact:	Alan Tull <[email protected]>
+Description:	Show bridge state as "enabled" or "disabled"

new file mode 100644
index 0000000..3b32ba1
@@ -0,0 +1,494 @@
+FPGA Region Device Tree Binding
+
+Alan Tull 2016
+
+ CONTENTS
+ - Introduction
+ - Terminology
+ - Sequence
+ - FPGA Region
+ - Supported Use Models
+ - Device Tree Examples
+ - Constraints
+
+
+Introduction
+============
+
+FPGA Regions represent FPGA's and partial reconfiguration regions of FPGA's in
+the Device Tree.  FPGA Regions provide a way to program FPGAs under device tree
+control.
+
+This device tree binding document hits some of the high points of FPGA usage and
+attempts to include terminology used by both major FPGA manufacturers.  This
+document isn't a replacement for any manufacturers specifications for FPGA
+usage.
+
+
+Terminology
+===========
+
+Full Reconfiguration
+ * The entire FPGA is programmed.
+
+Partial Reconfiguration (PR)
+ * A section of an FPGA is reprogrammed while the rest of the FPGA is not
+   affected.
+ * Not all FPGA's support PR.
+
+Partial Reconfiguration Region (PRR)
+ * Also called a "reconfigurable partition"
+ * A PRR is a specific section of a FPGA reserved for reconfiguration.
+ * A base (or static) FPGA image may create a set of PRR's that later may
+   be independently reprogrammed many times.
+ * The size and specific location of each PRR is fixed.
+ * The connections at the edge of each PRR are fixed.  The image that is loaded
+   into a PRR must fit and must use a subset of the region's connections.
+ * The busses within the FPGA are split such that each region gets its own
+   branch that may be gated independently.
+
+Persona
+ * Also called a "partial bit stream"
+ * An FPGA image that is designed to be loaded into a PRR.  There may be
+   any number of personas designed to fit into a PRR, but only one at at time
+   may be loaded.
+ * A persona may create more regions.
+
+FPGA Bridge
+ * FPGA Bridges gate bus signals between a host and FPGA.
+ * FPGA Bridges should be disabled while the FPGA is being programmed to
+   prevent spurious signals on the cpu bus and to the soft logic.
+ * FPGA bridges may be actual hardware or soft logic on an FPGA.
+ * During Full Reconfiguration, hardware bridges between the host and FPGA
+   will be disabled.
+ * During Partial Reconfiguration of a specific region, that region's bridge
+   will be used to gate the busses.  Traffic to other regions is not affected.
+ * In some implementations, the FPGA Manager transparantly handles gating the
+   buses, eliminating the need to show the hardware FPGA bridges in the
+   device tree.
+ * An FPGA image may create a set of reprogrammable regions, each having its
+   own bridge and its own split of the busses in the FPGA.
+
+FPGA Manager
+ * An FPGA Manager is a hardware block that programs an FPGA under the control
+   of a host processor.
+
+Base Image
+ * Also called the "static image"
+ * An FPGA image that is designed to do full reconfiguration of the FPGA.
+ * A base image may set up a set of partial reconfiguration regions that may
+   later be reprogrammed.
+
+    ----------------       ----------------------------------
+    |  Host CPU    |       |             FPGA               |
+    |              |       |                                |
+    |          ----|       |       -----------    --------  |
+    |          | H |       |   |==>| Bridge0 |<==>| PRR0 |  |
+    |          | W |       |   |   -----------    --------  |
+    |          |   |       |   |                            |
+    |          | B |<=====>|<==|   -----------    --------  |
+    |          | R |       |   |==>| Bridge1 |<==>| PRR1 |  |
+    |          | I |       |   |   -----------    --------  |
+    |          | D |       |   |                            |
+    |          | G |       |   |   -----------    --------  |
+    |          | E |       |   |==>| Bridge2 |<==>| PRR2 |  |
+    |          ----|       |       -----------    --------  |
+    |              |       |                                |
+    ----------------       ----------------------------------
+
+Figure 1: An FPGA set up with a base image that created three regions.  Each
+region (PRR0-2) gets its own split of the busses that is independently gated by
+a soft logic bridge (Bridge0-2) in the FPGA.  The contents of each PRR can be
+reprogrammed independently while the rest of the system continues to function.
+
+
+Sequence
+========
+
+When a DT overlay that targets a FPGA Region is applied, the FPGA Region will
+do the following:
+
+ 1. Disable appropriate FPGA bridges.
+ 2. Program the FPGA using the FPGA manager.
+ 3. Enable the FPGA bridges.
+ 4. The Device Tree overlay is accepted into the live tree.
+ 5. Child devices are populated.
+
+When the overlay is removed, the child nodes will be removed and the FPGA Region
+will disable the bridges.
+
+
+FPGA Region
+===========
+
+FPGA Regions represent FPGA's and FPGA PR regions in the device tree.  An FPGA
+Region brings together the elements needed to program on a running system and
+add the child devices:
+
+ * FPGA Manager
+ * FPGA Bridges
+ * image-specific information needed to to the programming.
+ * child nodes
+
+The intended use is that a Device Tree overlay (DTO) can be used to reprogram an
+FPGA while an operating system is running.
+
+An FPGA Region that exists in the live Device Tree reflects the current state.
+If the live tree shows a "firmware-name" property or child nodes under a FPGA
+Region, the FPGA already has been programmed.  A DTO that targets a FPGA Region
+and adds the "firmware-name" property is taken as a request to reprogram the
+FPGA.  After reprogramming is successful, the overlay is accepted into the live
+tree.
+
+The base FPGA Region in the device tree represents the FPGA and supports full
+reconfiguration.  It must include a phandle to an FPGA Manager.  The base
+FPGA region will be the child of one of the hardware bridges (the bridge that
+allows register access) between the cpu and the FPGA.  If there are more than
+one bridge to control during FPGA programming, the region will also contain a
+list of phandles to the additional hardware FPGA Bridges.
+
+For partial reconfiguration (PR), each PR region will have an FPGA Region.
+These FPGA regions are children of FPGA bridges which are then children of the
+base FPGA region.  The "Full Reconfiguration to add PRR's" example below shows
+this.
+
+If an FPGA Region does not specify a FPGA Manager, it will inherit the FPGA
+Manager specified by its ancestor FPGA Region.  This supports both the case
+where the same FPGA Manager is used for all of a FPGA as well the case where
+a different FPGA Manager is used for each region.
+
+FPGA Regions do not inherit their ancestor FPGA regions' bridges.  This prevents
+shutting down bridges that are upstream from the other active regions while one
+region is getting reconfigured (see Figure 1 above).  During PR, the FPGA's
+hardware bridges remain enabled.  The PR regions' bridges will be FPGA bridges
+within the static image of the FPGA.
+
+Required properties:
+- compatible : should contain "fpga-region"
+- fpga-mgr : should contain a phandle to an FPGA Manager.  Child FPGA Regions
+	inherit this property from their ancestor regions.  A fpga-mgr property
+	in a region will override any inherited FPGA manager.
+- #address-cells, #size-cells, ranges : must be present to handle address space
+	mapping for child nodes.
+
+Optional properties:
+- firmware-name : should contain the name of an FPGA image file located on the
+	firmware search path.  If this property shows up in a live device tree
+	it indicates that the FPGA has already been programmed with this image.
+	If this property is in an overlay targeting a FPGA region, it is a
+	request to program the FPGA with that image.
+- fpga-bridges : should contain a list of phandles to FPGA Bridges that must be
+	controlled during FPGA programming along with the parent FPGA bridge.
+	This property is optional if the FPGA Manager handles the bridges.
+        If the fpga-region is  the child of a fpga-bridge, the list should not
+        contain the parent bridge.
+- partial-fpga-config : boolean, set if partial reconfiguration is to be done,
+	otherwise full reconfiguration is done.
+- external-fpga-config : boolean, set if the FPGA has already been configured
+	prior to OS boot up.
+- region-unfreeze-timeout-us : The maximum time in microseconds to wait for
+	bridges to successfully become enabled after the region has been
+	programmed.
+- region-freeze-timeout-us : The maximum time in microseconds to wait for
+	bridges to successfully become disabled before the region has been
+	programmed.
+- child nodes : devices in the FPGA after programming.
+
+In the example below, when an overlay is applied targeting fpga-region0,
+fpga_mgr is used to program the FPGA.  Two bridges are controlled during
+programming: the parent fpga_bridge0 and fpga_bridge1.  Because the region is
+the child of fpga_bridge0, only fpga_bridge1 needs to be specified in the
+fpga-bridges property.  During programming, these bridges are disabled, the
+firmware specified in the overlay is loaded to the FPGA using the FPGA manager
+specified in the region.  If FPGA programming succeeds, the bridges are
+reenabled and the overlay makes it into the live device tree.  The child devices
+are then populated.  If FPGA programming fails, the bridges are left disabled
+and the overlay is rejected.  The overlay's ranges property maps the lwhps
+bridge's region (0xff200000) and the hps bridge's region (0xc0000000) for use by
+the two child devices.
+
+Example:
+Base tree contains:
+
+	fpga_mgr: fpga-mgr@ff706000 {
+		compatible = "altr,socfpga-fpga-mgr";
+		reg = <0xff706000 0x1000
+		       0xffb90000 0x20>;
+		interrupts = <0 175 4>;
+	};
+
+	fpga_bridge0: fpga-bridge@ff400000 {
+		compatible = "altr,socfpga-lwhps2fpga-bridge";
+		reg = <0xff400000 0x100000>;
+		resets = <&rst LWHPS2FPGA_RESET>;
+		clocks = <&l4_main_clk>;
+
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		fpga_region0: fpga-region0 {
+			compatible = "fpga-region";
+			fpga-mgr = <&fpga_mgr>;
+		};
+	};
+
+	fpga_bridge1: fpga-bridge@ff500000 {
+		compatible = "altr,socfpga-hps2fpga-bridge";
+		reg = <0xff500000 0x10000>;
+		resets = <&rst HPS2FPGA_RESET>;
+		clocks = <&l4_main_clk>;
+	};
+
+Overlay contains:
+
+/dts-v1/ /plugin/;
+/ {
+	fragment@0 {
+		target = <&fpga_region0>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			firmware-name = "soc_system.rbf";
+			fpga-bridges = <&fpga_bridge1>;
+			ranges = <0x20000 0xff200000 0x100000>,
+				 <0x0 0xc0000000 0x20000000>;
+
+			gpio@10040 {
+				compatible = "altr,pio-1.0";
+				reg = <0x10040 0x20>;
+				altr,gpio-bank-width = <4>;
+				#gpio-cells = <2>;
+				clocks = <2>;
+				gpio-controller;
+			};
+
+			onchip-memory {
+				device_type = "memory";
+				compatible = "altr,onchipmem-15.1";
+				reg = <0x0 0x10000>;
+			};
+		};
+	};
+};
+
+
+Supported Use Models
+====================
+
+In all cases the live DT must have the FPGA Manager, FPGA Bridges (if any), and
+a FPGA Region.  The target of the Device Tree Overlay is the FPGA Region.  Some
+uses are specific to a FPGA device.
+
+ * No FPGA Bridges
+   In this case, the FPGA Manager which programs the FPGA also handles the
+   bridges behind the scenes.  No FPGA Bridge devices are needed for full
+   reconfiguration.
+
+ * Full reconfiguration with hardware bridges
+   In this case, there are hardware bridges between the processor and FPGA that
+   need to be controlled during full reconfiguration.  Before the overlay is
+   applied, the live DT must include the FPGA Manager, FPGA Bridges, and a
+   FPGA Region.  The FPGA Region is the child of the bridge that allows
+   register access to the FPGA.  Additional bridges may be listed in a
+   fpga-bridges property in the FPGA region or in the device tree overlay.
+
+ * Partial reconfiguration with bridges in the FPGA
+   In this case, the FPGA will have one or more PRR's that may be programmed
+   separately while the rest of the FPGA can remain active.  To manage this,
+   bridges need to exist in the FPGA that can gate the buses going to each FPGA
+   region while the buses are enabled for other sections.  Before any partial
+   reconfiguration can be done, a base FPGA image must be loaded which includes
+   PRR's with FPGA bridges.  The device tree should have a FPGA region for each
+   PRR.
+
+Device Tree Examples
+====================
+
+The intention of this section is to give some simple examples, focusing on
+the placement of the elements detailed above, especially:
+ * FPGA Manager
+ * FPGA Bridges
+ * FPGA Region
+ * ranges
+ * target-path or target
+
+For the purposes of this section, I'm dividing the Device Tree into two parts,
+each with its own requirements.  The two parts are:
+ * The live DT prior to the overlay being added
+ * The DT overlay
+
+The live Device Tree must contain an FPGA Region, an FPGA Manager, and any FPGA
+Bridges.  The FPGA Region's "fpga-mgr" property specifies the manager by phandle
+to handle programming the FPGA.  If the FPGA Region is the child of another FPGA
+Region, the parent's FPGA Manager is used.  If FPGA Bridges need to be involved,
+they are specified in the FPGA Region by the "fpga-bridges" property.  During
+FPGA programming, the FPGA Region will disable the bridges that are in its
+"fpga-bridges" list and will re-enable them after FPGA programming has
+succeeded.
+
+The Device Tree Overlay will contain:
+ * "target-path" or "target"
+   The insertion point where the the contents of the overlay will go into the
+   live tree.  target-path is a full path, while target is a phandle.
+ * "ranges"
+    The address space mapping from processor to FPGA bus(ses).
+ * "firmware-name"
+   Specifies the name of the FPGA image file on the firmware search
+   path.  The search path is described in the firmware class documentation.
+ * "partial-fpga-config"
+   This binding is a boolean and should be present if partial reconfiguration
+   is to be done.
+ * child nodes corresponding to hardware that will be loaded in this region of
+   the FPGA.
+
+Device Tree Example: Full Reconfiguration without Bridges
+=========================================================
+
+Live Device Tree contains:
+	fpga_mgr0: fpga-mgr@f8007000 {
+		compatible = "xlnx,zynq-devcfg-1.0";
+		reg = <0xf8007000 0x100>;
+		interrupt-parent = <&intc>;
+		interrupts = <0 8 4>;
+		clocks = <&clkc 12>;
+		clock-names = "ref_clk";
+		syscon = <&slcr>;
+	};
+
+	fpga_region0: fpga-region0 {
+		compatible = "fpga-region";
+		fpga-mgr = <&fpga_mgr0>;
+		#address-cells = <0x1>;
+		#size-cells = <0x1>;
+		ranges;
+	};
+
+DT Overlay contains:
+/dts-v1/ /plugin/;
+/ {
+fragment@0 {
+	target = <&fpga_region0>;
+	#address-cells = <1>;
+	#size-cells = <1>;
+	__overlay__ {
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		firmware-name = "zynq-gpio.bin";
+
+		gpio1: gpio@40000000 {
+			compatible = "xlnx,xps-gpio-1.00.a";
+			reg = <0x40000000 0x10000>;
+			gpio-controller;
+			#gpio-cells = <0x2>;
+			xlnx,gpio-width= <0x6>;
+		};
+	};
+};
+
+Device Tree Example: Full Reconfiguration to add PRR's
+======================================================
+
+The base FPGA Region is specified similar to the first example above.
+
+This example programs the FPGA to have two regions that can later be partially
+configured.  Each region has its own bridge in the FPGA fabric.
+
+DT Overlay contains:
+/dts-v1/ /plugin/;
+/ {
+	fragment@0 {
+		target = <&fpga_region0>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			firmware-name = "base.rbf";
+
+			fpga-bridge@4400 {
+				compatible = "altr,freeze-bridge";
+				reg = <0x4400 0x10>;
+
+				fpga_region1: fpga-region1 {
+					compatible = "fpga-region";
+					#address-cells = <0x1>;
+					#size-cells = <0x1>;
+					ranges;
+				};
+			};
+
+			fpga-bridge@4420 {
+				compatible = "altr,freeze-bridge";
+				reg = <0x4420 0x10>;
+
+				fpga_region2: fpga-region2 {
+					compatible = "fpga-region";
+					#address-cells = <0x1>;
+					#size-cells = <0x1>;
+					ranges;
+				};
+			};
+		};
+	};
+};
+
+Device Tree Example: Partial Reconfiguration
+============================================
+
+This example reprograms one of the PRR's set up in the previous example.
+
+The sequence that occurs when this overlay is similar to the above, the only
+differences are that the FPGA is partially reconfigured due to the
+"partial-fpga-config" boolean and the only bridge that is controlled during
+programming is the FPGA based bridge of fpga_region1.
+
+/dts-v1/ /plugin/;
+/ {
+	fragment@0 {
+		target = <&fpga_region1>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			firmware-name = "soc_image2.rbf";
+			partial-fpga-config;
+
+			gpio@10040 {
+				compatible = "altr,pio-1.0";
+				reg = <0x10040 0x20>;
+				clocks = <0x2>;
+				altr,gpio-bank-width = <0x4>;
+				resetvalue = <0x0>;
+				#gpio-cells = <0x2>;
+				gpio-controller;
+			};
+		};
+	};
+};
+
+Constraints
+===========
+
+It is beyond the scope of this document to fully describe all the FPGA design
+constraints required to make partial reconfiguration work[1] [2] [3], but a few
+deserve quick mention.
+
+A persona must have boundary connections that line up with those of the partion
+or region it is designed to go into.
+
+During programming, transactions through those connections must be stopped and
+the connections must be held at a fixed logic level.  This can be achieved by
+FPGA Bridges that exist on the FPGA fabric prior to the partial reconfiguration.
+
+--
+[1] www.altera.com/content/dam/altera-www/global/en_US/pdfs/literature/ug/ug_partrecon.pdf
+[2] tspace.library.utoronto.ca/bitstream/1807/67932/1/Byma_Stuart_A_201411_MAS_thesis.pdf
+[3] http://www.xilinx.com/support/documentation/sw_manuals/xilinx14_1/ug702.pdf

index e0e1257..5605ad6 100644
@@ -40,6 +40,13 @@ config FPGA_BRIDGE
 	  Say Y here if you want to support bridges connected between host
 	  processors and FPGAs or between FPGAs.
 
+config SOCFPGA_FPGA_BRIDGE
+	tristate "Altera SoCFPGA FPGA Bridges"
+	depends on ARCH_SOCFPGA && FPGA_BRIDGE
+	help
+	  Say Y to enable drivers for FPGA bridges for Altera SOCFPGA
+	  devices.
+
 endif # FPGA
 
 endmenu

index 8d746c3..e658436 100644
@@ -11,6 +11,7 @@ obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA)	+= zynq-fpga.o
 
 # FPGA Bridge Drivers
 obj-$(CONFIG_FPGA_BRIDGE)		+= fpga-bridge.o
+obj-$(CONFIG_SOCFPGA_FPGA_BRIDGE)	+= altera-hps2fpga.o altera-fpga2sdram.o
 
 # High Level Interfaces
 obj-$(CONFIG_FPGA_REGION)		+= fpga-region.o

index 8fe6a84..889e4c3 100644
@@ -26,6 +26,12 @@ config FPGA_MGR_SOCFPGA
 	help
 	  FPGA manager driver support for Altera SOCFPGA.
 
+config FPGA_MGR_SOCFPGA_A10
+	tristate "Altera SoCFPGA Arria10"
+	depends on ARCH_SOCFPGA
+	help
+	  FPGA manager driver support for Altera Arria10 SoCFPGA.
+
 config FPGA_MGR_ZYNQ_FPGA
 	tristate "Xilinx Zynq FPGA"
 	depends on ARCH_ZYNQ || COMPILE_TEST

index a6f874d..8df07bc 100644
@@ -7,6 +7,7 @@ obj-$(CONFIG_FPGA)			+= fpga-mgr.o
 
 # FPGA Manager Drivers
 obj-$(CONFIG_FPGA_MGR_SOCFPGA)		+= socfpga.o
+obj-$(CONFIG_FPGA_MGR_SOCFPGA_A10)	+= socfpga-a10.o
 obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA)	+= zynq-fpga.o
 
 # FPGA Bridge Drivers

index 5605ad6..8fe6a84 100644
@@ -47,6 +47,15 @@ config SOCFPGA_FPGA_BRIDGE
 	  Say Y to enable drivers for FPGA bridges for Altera SOCFPGA
 	  devices.
 
+config ALTERA_FREEZE_BRIDGE
+	tristate "Altera FPGA Freeze Bridge"
+	depends on ARCH_SOCFPGA && FPGA_BRIDGE
+	help
+	  Say Y to enable drivers for Altera FPGA Freeze bridges.  A
+	  freeze bridge is a bridge that exists in the FPGA fabric to
+	  isolate one region of the FPGA from the busses while that
+	  region is being reprogrammed.
+
 endif # FPGA
 
 endmenu

index e658436..a6f874d 100644
@@ -12,6 +12,7 @@ obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA)	+= zynq-fpga.o
 # FPGA Bridge Drivers
 obj-$(CONFIG_FPGA_BRIDGE)		+= fpga-bridge.o
 obj-$(CONFIG_SOCFPGA_FPGA_BRIDGE)	+= altera-hps2fpga.o altera-fpga2sdram.o
+obj-$(CONFIG_ALTERA_FREEZE_BRIDGE)	+= altera-freeze-bridge.o
 
 # High Level Interfaces
 obj-$(CONFIG_FPGA_REGION)		+= fpga-region.o

index d056d69..087924f 100644
@@ -18,21 +18,25 @@ API Functions:
 To program the FPGA from a file or from a buffer:
 -------------------------------------------------
 
-	int fpga_mgr_buf_load(struct fpga_manager *mgr, u32 flags,
+	int fpga_mgr_buf_load(struct fpga_manager *mgr,
+			      struct fpga_image_info *info,
 		              const char *buf, size_t count);
 
 Load the FPGA from an image which exists as a buffer in memory.
 
-	int fpga_mgr_firmware_load(struct fpga_manager *mgr, u32 flags,
+	int fpga_mgr_firmware_load(struct fpga_manager *mgr,
+				   struct fpga_image_info *info,
 		                   const char *image_name);
 
 Load the FPGA from an image which exists as a file.  The image file must be on
-the firmware search path (see the firmware class documentation).
-
-For both these functions, flags == 0 for normal full reconfiguration or
-FPGA_MGR_PARTIAL_RECONFIG for partial reconfiguration.  If successful, the FPGA
-ends up in operating mode.  Return 0 on success or a negative error code.
+the firmware search path (see the firmware class documentation).  If successful,
+the FPGA ends up in operating mode.  Return 0 on success or a negative error
+code.
 
+A FPGA design contained in a FPGA image file will likely have particulars that
+affect how the image is programmed to the FPGA.  These are contained in struct
+fpga_image_info.  Currently the only such particular is a single flag bit
+indicating whether the image is for full or partial reconfiguration.
 
 To get/put a reference to a FPGA manager:
 -----------------------------------------

@@ -72,8 +76,11 @@ struct device_node *mgr_node = ...
 char *buf = ...
 int count = ...
 
+/* struct with information about the FPGA image to program. */
+struct fpga_image_info info;
+
 /* flags indicates whether to do full or partial reconfiguration */
-int flags = 0;
+info.flags = 0;
 
 int ret;
 

@@ -81,7 +88,7 @@ int ret;
 struct fpga_manager *mgr = of_fpga_mgr_get(mgr_node);
 
 /* Load the buffer to the FPGA */
-ret = fpga_mgr_buf_load(mgr, flags, buf, count);
+ret = fpga_mgr_buf_load(mgr, &info, buf, count);
 
 /* Release the FPGA manager */
 fpga_mgr_put(mgr);

@@ -98,8 +105,11 @@ struct device_node *mgr_node = ...
 /* FPGA image is in this file which is in the firmware search path */
 const char *path = "fpga-image-9.rbf"
 
+/* struct with information about the FPGA image to program. */
+struct fpga_image_info info;
+
 /* flags indicates whether to do full or partial reconfiguration */
-int flags = 0;
+info.flags = 0;
 
 int ret;
 

@@ -107,7 +117,7 @@ int ret;
 struct fpga_manager *mgr = of_fpga_mgr_get(mgr_node);
 
 /* Get the firmware image (path) and load it to the FPGA */
-ret = fpga_mgr_firmware_load(mgr, flags, path);
+ret = fpga_mgr_firmware_load(mgr, &info, path);
 
 /* Release the FPGA manager */
 fpga_mgr_put(mgr);

index 9b20f45..e0e1257 100644
@@ -13,6 +13,13 @@ config FPGA
 
 if FPGA
 
+config FPGA_REGION
+	tristate "FPGA Region"
+	depends on OF && FPGA_BRIDGE
+	help
+	  FPGA Regions allow loading FPGA images under control of
+	  the Device Tree.
+
 config FPGA_MGR_SOCFPGA
 	tristate "Altera SOCFPGA FPGA Manager"
 	depends on ARCH_SOCFPGA

index 4baef00..8d746c3 100644
@@ -11,3 +11,6 @@ obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA)	+= zynq-fpga.o
 
 # FPGA Bridge Drivers
 obj-$(CONFIG_FPGA_BRIDGE)		+= fpga-bridge.o
+
+# High Level Interfaces
+obj-$(CONFIG_FPGA_REGION)		+= fpga-region.o

index cd84934..9b20f45 100644
@@ -26,6 +26,13 @@ config FPGA_MGR_ZYNQ_FPGA
 	help
 	  FPGA manager driver support for Xilinx Zynq FPGAs.
 
+config FPGA_BRIDGE
+	tristate "FPGA Bridge Framework"
+	depends on OF
+	help
+	  Say Y here if you want to support bridges connected between host
+	  processors and FPGAs or between FPGAs.
+
 endif # FPGA
 
 endmenu

index 8d83fc6..4baef00 100644
@@ -8,3 +8,6 @@ obj-$(CONFIG_FPGA)			+= fpga-mgr.o
 # FPGA Manager Drivers
 obj-$(CONFIG_FPGA_MGR_SOCFPGA)		+= socfpga.o
 obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA)	+= zynq-fpga.o
+
+# FPGA Bridge Drivers
+obj-$(CONFIG_FPGA_BRIDGE)		+= fpga-bridge.o