FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/rtc/maxim,ds3231.txt

     * Maxim DS3231 Real Time Clock
     
     Required properties:
     - compatible: Should contain "maxim,ds3231".
     - reg: I2C address for chip.
     
     Optional property:
     - #clock-cells: Should be 1.
     - clock-output-names:
      overwrite the default clock names "ds3231_clk_sqw" and "ds3231_clk_32khz".
    
    Each clock is assigned an identifier and client nodes can use this identifier
    to specify the clock which they consume. Following indices are allowed:
        - 0: square-wave output on the SQW pin
        - 1: square-wave output on the 32kHz pin
    
    - interrupts: rtc alarm/event interrupt. When this property is selected,
      clock on the SQW pin cannot be used.
    
    Example:
    
    ds3231: ds3231@51 {
            compatible = "maxim,ds3231";
            reg = <0x68>;
            #clock-cells = <1>;
    };
    
    device1 {
    ...
            clocks = <&ds3231 0>;
    ...
    };
    
    device2 {
    ...
            clocks = <&ds3231 1>;
    ...
    };

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