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>
