The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/hwlock/qcom-hwspinlock.txt

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    1 Qualcomm Hardware Mutex Block:
    2 
    3 The hardware block provides mutexes utilized between different processors on
    4 the SoC as part of the communication protocol used by these processors.
    5 
    6 - compatible:
    7         Usage: required
    8         Value type: <string>
    9         Definition: must be one of:
   10                     "qcom,sfpb-mutex",
   11                     "qcom,tcsr-mutex"
   12 
   13 - syscon:
   14         Usage: required
   15         Value type: <prop-encoded-array>
   16         Definition: one cell containing:
   17                     syscon phandle
   18                     offset of the hwmutex block within the syscon
   19                     stride of the hwmutex registers
   20 
   21 - #hwlock-cells:
   22         Usage: required
   23         Value type: <u32>
   24         Definition: must be 1, the specified cell represent the lock id
   25                     (hwlock standard property, see hwlock.txt)
   26 
   27 Example:
   28 
   29         tcsr_mutex_block: syscon@fd484000 {
   30                 compatible = "syscon";
   31                 reg = <0xfd484000 0x2000>;
   32         };
   33 
   34         hwlock@fd484000 {
   35                 compatible = "qcom,tcsr-mutex";
   36                 syscon = <&tcsr_mutex_block 0 0x80>;
   37 
   38                 #hwlock-cells = <1>;
   39         };

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