linux-kernel - [PATCH V8 18/21] dt-bindings: csky CPU Bindings

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Message-Id: <1c77e479a1dc0119912ac146b1038963b3653381.1539315391.git.ren_guo@c-sky.com>
Date:   Fri, 12 Oct 2018 12:42:53 +0800
From:   Guo Ren <ren_guo@...ky.com>
To:     akpm@...ux-foundation.org, arnd@...db.de,
        daniel.lezcano@...aro.org, davem@...emloft.net,
        gregkh@...uxfoundation.org, hch@...radead.org,
        marc.zyngier@....com, mark.rutland@....com, peterz@...radead.org,
        robh@...nel.org, tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        c-sky_gcc_upstream@...ky.com, Guo Ren <ren_guo@...ky.com>
Subject: [PATCH V8 18/21] dt-bindings: csky CPU Bindings

This patch adds the documentation to describe that how to add cpu nodes in
dts for SMP.

Signed-off-by: Guo Ren <ren_guo@...ky.com>
Cc: Rob Herring <robh@...nel.org>
---
 Documentation/devicetree/bindings/csky/cpus.txt | 70 +++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/csky/cpus.txt

diff --git a/Documentation/devicetree/bindings/csky/cpus.txt b/Documentation/devicetree/bindings/csky/cpus.txt
new file mode 100644
index 0000000..ee3901d
--- /dev/null
+++ b/Documentation/devicetree/bindings/csky/cpus.txt
@@ -0,0 +1,70 @@
+==================
+C-SKY CPU Bindings
+==================
+
+The device tree allows to describe the layout of CPUs in a system through
+the "cpus" node, which in turn contains a number of subnodes (ie "cpu")
+defining properties for every cpu.
+
+Only SMP system need to care about the cpus node and single processor
+needn't define cpus node at all.
+
+=====================================
+cpus and cpu node bindings definition
+=====================================
+
+- cpus node
+
+        Description: Container of cpu nodes
+
+        The node name must be "cpus".
+
+        A cpus node must define the following properties:
+
+        - #address-cells
+                Usage: required
+                Value type: <u32>
+                Definition: must be set to 1
+        - #size-cells
+                Usage: required
+                Value type: <u32>
+                Definition: must be set to 0
+
+- cpu node
+
+        Description: Describes one of SMP cores
+
+        PROPERTIES
+
+        - device_type
+                Usage: required
+                Value type: <string>
+                Definition: must be "cpu"
+        - reg
+                Usage: required
+                Value type: <u32>
+                Definition: CPU index
+        - status:
+                Usage: required
+                Value type: <string>
+                Definition: "ok"       means enable  the cpu-core
+                            "disabled" means disable the cpu-core
+
+Example:
+--------
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		cpu@0 {
+			device_type = "cpu";
+			reg = <0>;
+			status = "ok";
+		};
+
+		cpu@1 {
+			device_type = "cpu";
+			reg = <1>;
+			status = "ok";
+		};
+	};
-- 
2.7.4