dt-bindings: hwlock: Document STM32 hwspinlock bindings

Add bindings for STM32 hardware spinlock device

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

diff --git a/Documentation/devicetree/bindings/hwlock/st,stm32-hwspinlock.txt b/Documentation/devicetree/bindings/hwlock/st,stm32-hwspinlock.txt
new file mode 100644 (file)
index 0000000..adf4f00
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+++ b/Documentation/devicetree/bindings/hwlock/st,stm32-hwspinlock.txt
@@ -0,0 +1,23 @@
+STM32 Hardware Spinlock Device Binding
+-------------------------------------
+
+Required properties :
+- compatible : should be "st,stm32-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.
+- clock-names : Must contain "hsem".
+- clocks : Must contain a phandle entry for the clock in clock-names, see the
+       common clock bindings.
+
+Please look at the generic hwlock binding for usage information for consumers,
+"Documentation/devicetree/bindings/hwlock/hwlock.txt"
+
+Example of hwlock provider:
+       hwspinlock@4c000000 {
+               compatible = "st,stm32-hwspinlock";
+               #hwlock-cells = <1>;
+               reg = <0x4c000000 0x400>;
+               clocks = <&rcc HSEM>;
+               clock-names = "hsem";
+       };