On Thu, 07 Nov 2019 13:24:07 PST (-0800), Christoph Hellwig wrote:
Add the binding for the trivial Qemu RISC-V poweroff mechanism, which is just a single MMIO register exposed through the DT. Signed-off-by: Christoph Hellwig <hch@xxxxxx> --- .../power/reset/qemu-riscv-virt-poweroff.txt | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) create mode 100644 Documentation/devicetree/bindings/power/reset/qemu-riscv-virt-poweroff.txt diff --git a/Documentation/devicetree/bindings/power/reset/qemu-riscv-virt-poweroff.txt b/Documentation/devicetree/bindings/power/reset/qemu-riscv-virt-poweroff.txt new file mode 100644 index 000000000000..80ff6fd4e3b7 --- /dev/null +++ b/Documentation/devicetree/bindings/power/reset/qemu-riscv-virt-poweroff.txt @@ -0,0 +1,16 @@ +QEMU RISC-V virt machine poweroff device + +This is a device in Qemu that can signal successful or error exit +by writing two magic numbers to a trivial mmio register. +A Linux poweroff is implemented as successful exit.
There's a third value that reboots the system, but it's only implemented in qemu-4.2 (not released yet) and above. It'll be 'compatible = "sifive,test1", "sifive,test0";' (or at least will be when I merge my patch to do so).
+ +Required Properties: +-compatible: "sifive,test0" +-reg: Specifies the physical address of the register + +Example: + + test@100000 { + compatible = "sifive,test0"; + reg = <0x100000 0x1000>; + };
Reviewed-by: Palmer Dabbelt <palmer@xxxxxxxxxxx>