Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 479 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/fpga/fpga-region.txt b/Documentation/devicetree/bindings/fpga/fpga-region.txt
new file mode 100644
index 000000000..6694ef29a
--- /dev/null
+++ b/Documentation/devicetree/bindings/fpga/fpga-region.txt
@@ -0,0 +1,479 @@
+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 an 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 an 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 an FPGA
+Region, the FPGA already has been programmed.  A DTO that targets an 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 an 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 an 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.  An 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 an 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 an 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.
+- encrypted-fpga-config : boolean, set if the bitstream is encrypted
+- 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.
+- config-complete-timeout-us : The maximum time in microseconds time for the
+	FPGA to go to operating mode after 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/;
+
+&fpga_region0 {
+	#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,ngpio = <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 an 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 an 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 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/;
+
+&fpga_region0 {
+	#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/;
+
+&fpga_region0 {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	firmware-name = "base.rbf";
+
+	fpga-bridge@4400 {
+		compatible = "altr,freeze-bridge-controller";
+		reg = <0x4400 0x10>;
+
+		fpga_region1: fpga-region1 {
+			compatible = "fpga-region";
+			#address-cells = <0x1>;
+			#size-cells = <0x1>;
+			ranges;
+		};
+	};
+
+	fpga-bridge@4420 {
+		compatible = "altr,freeze-bridge-controller";
+		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/;
+
+&fpga_region1 {
+	#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,ngpio = <0x4>;
+		#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] https://www.xilinx.com/support/documentation/sw_manuals/xilinx14_1/ug702.pdf