0001 Motorola mc146818 compatible RTC
0002 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0003
0004 Required properties:
0005 - compatible : "motorola,mc146818"
0006 - reg : should contain registers location and length.
0007
0008 Optional properties:
0009 - interrupts : should contain interrupt.
0010 - ctrl-reg : Contains the initial value of the control register also
0011 called "Register B".
0012 - freq-reg : Contains the initial value of the frequency register also
0013 called "Regsiter A".
0014
0015 "Register A" and "B" are usually initialized by the firmware (BIOS for
0016 instance). If this is not done, it can be performed by the driver.
0017
0018 ISA Example:
0019
0020 rtc@70 {
0021 compatible = "motorola,mc146818";
0022 interrupts = <8 3>;
0023 interrupt-parent = <&ioapic1>;
0024 ctrl-reg = <2>;
0025 freq-reg = <0x26>;
0026 reg = <1 0x70 2>;
0027 };
