[PATCH v4 2/3] Documentation: dt: add the CSR atlas7 hwspinlock bindings document

[Barry Song <21cnbao-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

From: Wei Chen <wei.chen-kQvG35nSl+M@public.gmane.org>

The Hardware Spinlock device on atlas7 provides hardware assistance
for synchronization between the multiple processors in the system
(dual Cortex-A7, CAN bus Cortex-M3 and audio DSP).
This patch adds the DT bindings information for this hwspinlock
module.

Cc: Suman Anna <s-anna-l0cyMroinI0@public.gmane.org>
Cc: Bjorn Andersson <bjorn-UYDU3/A3LUY@public.gmane.org>
Signed-off-by: Wei Chen <wei.chen-kQvG35nSl+M@public.gmane.org>
Signed-off-by: Barry Song <Baohua.Song-kQvG35nSl+M@public.gmane.org>
---
 -v4: add description for "#hwlock-cells"
 thanks suman!

 .../devicetree/bindings/hwlock/sirf,hwspinlock.txt | 28 ++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwlock/sirf,hwspinlock.txt

diff --git a/Documentation/devicetree/bindings/hwlock/sirf,hwspinlock.txt b/Documentation/devicetree/bindings/hwlock/sirf,hwspinlock.txt
new file mode 100644
index 0000000..9bb1240a6
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwlock/sirf,hwspinlock.txt
@@ -0,0 +1,28 @@
+SIRF Hardware spinlock device Binding
+-----------------------------------------------
+
+Required properties :
+- compatible : shall contain only one of the following:
+	"sirf,hwspinlock"
+
+- reg : the register address of hwspinlock
+
+- #hwlock-cells : hwlock users only use the hwlock id to represent a specific
+	hwlock, so the number of cells should be <1> here.
+
+Please look at the generic hwlock binding for usage information for consumers,
+"Documentation/devicetree/bindings/hwlock/hwlock.txt"
+
+Example of hwlock provider:
+	hwlock {
+		compatible = "sirf,hwspinlock";
+		reg = <0x13240000 0x00010000>;
+		#hwlock-cells = <1>;
+	};
+
+Example of hwlock users:
+	node {
+		...
+		hwlocks = <&hwlock 2>;
+		...
+	};
-- 
2.3.5

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