qemu,fw-cfg-mmio.yaml

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    1 # SPDX-License-Identifier: GPL-2.0
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/firmware/qemu,fw-cfg-mmio.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: QEMU Firmware Configuration bindings
    8 
    9 maintainers:
   10   - Rob Herring <robh@kernel.org>
   11 
   12 description: |
   13   Various QEMU emulation / virtualization targets provide the following
   14   Firmware Configuration interface on the "virt" machine type:
   15 
   16   - A write-only, 16-bit wide selector (or control) register,
   17   - a read-write, 64-bit wide data register.
   18 
   19   QEMU exposes the control and data register to guests as memory mapped
   20   registers; their location is communicated to the guest's UEFI firmware in the
   21   DTB that QEMU places at the bottom of the guest's DRAM.
   22 
   23   The authoritative guest-side hardware interface documentation to the fw_cfg
   24   device can be found in "docs/specs/fw_cfg.txt" in the QEMU source tree.
   25 
   26 
   27 properties:
   28   compatible:
   29     const: qemu,fw-cfg-mmio
   30 
   31   reg:
   32     maxItems: 1
   33     description: |
   34       * Bytes 0x0 to 0x7 cover the data register.
   35       * Bytes 0x8 to 0x9 cover the selector register.
   36       * Further registers may be appended to the region in case of future interface
   37         revisions / feature bits.
   38 
   39   dma-coherent: true
   40 
   41 required:
   42   - compatible
   43   - reg
   44 
   45 additionalProperties: false
   46 
   47 examples:
   48   - |
   49 
   50     fw-cfg@9020000 {
   51         compatible = "qemu,fw-cfg-mmio";
   52         reg = <0x9020000 0xa>;
   53     };
   54 ...

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/firmware/qemu,fw-cfg-mmio.yaml

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/firmware/qemu,fw-cfg-mmio.yaml