xref: /OK3568_Linux_fs/kernel/Documentation/devicetree/bindings/misc/pvpanic-mmio.txt (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun* QEMU PVPANIC MMIO Configuration bindings
2*4882a593Smuzhiyun
3*4882a593SmuzhiyunQEMU's emulation / virtualization targets provide the following PVPANIC
4*4882a593SmuzhiyunMMIO Configuration interface on the "virt" machine.
5*4882a593Smuzhiyuntype:
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun- a read-write, 16-bit wide data register.
8*4882a593Smuzhiyun
9*4882a593SmuzhiyunQEMU exposes the data register to guests as memory mapped registers.
10*4882a593Smuzhiyun
11*4882a593SmuzhiyunRequired properties:
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun- compatible: "qemu,pvpanic-mmio".
14*4882a593Smuzhiyun- reg: the MMIO region used by the device.
15*4882a593Smuzhiyun  * Bytes 0x0  Write panic event to the reg when guest OS panics.
16*4882a593Smuzhiyun  * Bytes 0x1  Reserved.
17*4882a593Smuzhiyun
18*4882a593SmuzhiyunExample:
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun/ {
21*4882a593Smuzhiyun        #size-cells = <0x2>;
22*4882a593Smuzhiyun        #address-cells = <0x2>;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun        pvpanic-mmio@9060000 {
25*4882a593Smuzhiyun                compatible = "qemu,pvpanic-mmio";
26*4882a593Smuzhiyun                reg = <0x0 0x9060000 0x0 0x2>;
27*4882a593Smuzhiyun        };
28*4882a593Smuzhiyun};
29*4882a593Smuzhiyun
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