rtc-cmos.txt

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    1  Motorola mc146818 compatible RTC
    2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    3 
    4 Required properties:
    5   - compatible : "motorola,mc146818"
    6   - reg : should contain registers location and length.
    7 
    8 Optional properties:
    9   - interrupts : should contain interrupt.
   10   - ctrl-reg : Contains the initial value of the control register also
   11     called "Register B".
   12   - freq-reg : Contains the initial value of the frequency register also
   13     called "Regsiter A".
   14 
   15 "Register A" and "B" are usually initialized by the firmware (BIOS for
   16 instance). If this is not done, it can be performed by the driver.
   17 
   18 ISA Example:
   19 
   20         rtc@70 {
   21                  compatible = "motorola,mc146818";
   22                  interrupts = <8 3>;
   23                  interrupt-parent = <&ioapic1>;
   24                  ctrl-reg = <2>;
   25                  freq-reg = <0x26>;
   26                  reg = <1 0x70 2>;
   27          };

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

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