[PATCH v8 1/2] DT: hwspinlock: Add binding documentation for Qualcomm hwmutex
From: Bjorn Andersson <hidden>
Date: 2015-03-24 17:11:22
Also in:
linux-arm-msm, lkml
Subsystem:
arm/qualcomm mailing list, hardware spinlock core, open firmware and flattened device tree bindings, the rest · Maintainers:
Bjorn Andersson, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Add binding documentation for the Qualcomm Hardware Mutex. Reviewed-by: Andy Gross <redacted> Reviewed-by: Jeffrey Hugo <redacted> Signed-off-by: Bjorn Andersson <redacted> --- Changes since v7: - Corrected address, compatible and naming of the tcsr block Changes since v6: - Corrected indentation error in example 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..4563f52
--- /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_mutex_block: syscon@fd484000 { + compatible = "syscon"; + reg = <0xfd484000 0x2000>; + }; + + hwlock@fd484000 { + compatible = "qcom,tcsr-mutex"; + syscon = <&tcsr_mutex_block 0 0x80>; + + #hwlock-cells = <1>; + };
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1.8.2.2