[PATCH 1/2] dt-bindings: power: reset: document the QEMU RISC-V virt machine poweroff device

From: Christoph Hellwig <hch@lst.de>
To: Sebastian Reichel <sre@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>
Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
	linux-riscv@lists.infradead.org
Subject: [PATCH 1/2] dt-bindings: power: reset: document the QEMU RISC-V virt machine poweroff device
Date: Thu,  7 Nov 2019 22:24:07 +0100	[thread overview]
Message-ID: <20191107212408.11857-2-hch@lst.de> (raw)
In-Reply-To: <20191107212408.11857-1-hch@lst.de>

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@lst.de>
---
 .../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.
+
+Required Properties:
+-compatible: "sifive,test0"
+-reg: Specifies the physical address of the register
+
+Example:
+
+	test@100000 {
+		compatible = "sifive,test0";
+		reg = <0x100000 0x1000>;
+	};
-- 
2.20.1

