Add binding documentation for the Qualcomm Hardware Mutex.
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>
---
I think the conclusion on the dt binding discussion for hwspinlocks was that
we're down to having the #hwlock-cells intact. So this version includes that,
but non of the other previously discussed properties.
Changes since v5:
- Extracted the dt binding documentation into a separate patch
- Moved the driver to consume a syscon
- Dropped previously suggested generic hwlock dt bindings
.../devicetree/bindings/hwlock/qcom-hwspinlock.txt | 39 ++++++++++++++++++++++
1 file changed, 39 insertions(+)
create mode 100644 Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt
diff --git a/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt b/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt
new file mode 100644
index 0000000..28ade7d
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt
@@ -0,0 +1,39 @@
+Qualcomm Hardware Mutex Block:
+
+The hardware block provides mutexes utilized between different processors on
+the SoC as part of the communication protocol used by these processors.
+
+- compatible:
+ Usage: required
+ Value type: <string>
+ Definition: must be one of:
+ "qcom,sfpb-mutex",
+ "qcom,tcsr-mutex"
+
+- syscon:
+ Usage: required
+ Value type: <prop-encoded-array>
+ Definition: one cell containing:
+ syscon phandle
+ offset of the hwmutex block within the syscon
+ stride of the hwmutex registers
+
+- #hwlock-cells:
+ Usage: required
+ Value type: <u32>
+ Definition: must be 1, the specified cell represent the lock id
+ (hwlock standard property, see hwlock.txt)
+
+Example:
+
+ tcsr: syscon@1a400000 {
+ compatible = "qcom,tcsr-msm8974", "syscon";
+ reg = <0xfd484000 0x2000>;
+ };
+
+ hwlock@fd484000 {
+ compatible = "qcom,tcsr-mutex";
+ syscon = <&tcsr 0 0x80>;
+
+ #hwlock-cells = <1>;
+ };
--
1.8.2.2
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