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authorBjorn Andersson <bjorn.andersson@sonymobile.com>2015-03-24 10:11:04 -0700
committerOhad Ben-Cohen <ohad@wizery.com>2015-05-02 10:17:53 +0300
commit5b5711f0f1aff1b25ee48da279de4f0c202f7a68 (patch)
tree6a5dec5e4858667fb478ce6810755b99ef189793 /Documentation/devicetree
parent65bd4341d61678494ea14994d0d7df73644ca014 (diff)
downloadop-kernel-dev-5b5711f0f1aff1b25ee48da279de4f0c202f7a68.zip
op-kernel-dev-5b5711f0f1aff1b25ee48da279de4f0c202f7a68.tar.gz
DT: hwspinlock: Add binding documentation for Qualcomm hwmutex
Add binding documentation for the Qualcomm Hardware Mutex. Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> Acked-by: Kumar Gala <galak@codeaurora.org> Reviewed-by: Andy Gross <agross@codeaurora.org> Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org> Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
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-rw-r--r--Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt39
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diff --git a/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt b/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt
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+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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