linux/linux-5.4.31/Documentation/devicetree/bindings/misc/pvpanic-mmio.txt

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* QEMU PVPANIC MMIO Configuration bindings
QEMU's emulation / virtualization targets provide the following PVPANIC
MMIO Configuration interface on the "virt" machine.
type:
- a read-write, 16-bit wide data register.
QEMU exposes the data register to guests as memory mapped registers.
Required properties:
- compatible: "qemu,pvpanic-mmio".
- reg: the MMIO region used by the device.
* Bytes 0x0 Write panic event to the reg when guest OS panics.
* Bytes 0x1 Reserved.
Example:
/ {
#size-cells = <0x2>;
#address-cells = <0x2>;
pvpanic-mmio@9060000 {
compatible = "qemu,pvpanic-mmio";
reg = <0x0 0x9060000 0x0 0x2>;
};
};