FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/regmap/regmap.txt

     Devicetree binding for regmap
     
     Optional properties:
     
        little-endian,
        big-endian,
        native-endian:       See common-properties.txt for a definition
     
     Note:
    Regmap defaults to little-endian register access on MMIO based
    devices, this is by far the most common setting. On CPU
    architectures that typically run big-endian operating systems
    (e.g. PowerPC), registers can be defined as big-endian and must
    be marked that way in the devicetree.
    
    On SoCs that can be operated in both big-endian and little-endian
    modes, with a single hardware switch controlling both the endianness
    of the CPU and a byteswap for MMIO registers (e.g. many Broadcom MIPS
    chips), "native-endian" is used to allow using the same device tree
    blob in both cases.
    
    Examples:
    Scenario 1 : a register set in big-endian mode.
    dev: dev@40031000 {
                  compatible = "syscon";
                  reg = <0x40031000 0x1000>;
                  big-endian;
                  ...
    };

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