1 Motorola mc146818 compatible RTC 2~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3 4Required properties: 5 - compatible : "motorola,mc146818" 6 - reg : should contain registers location and length. 7 8Optional properties: 9 - interrupts : should contain interrupt. 10 - interrupt-parent : interrupt source phandle. 11 - ctrl-reg : Contains the initial value of the control register also 12 called "Register B". 13 - freq-reg : Contains the initial value of the frequency register also 14 called "Regsiter A". 15 16"Register A" and "B" are usually initialized by the firmware (BIOS for 17instance). If this is not done, it can be performed by the driver. 18 19ISA Example: 20 21 rtc@70 { 22 compatible = "motorola,mc146818"; 23 interrupts = <8 3>; 24 interrupt-parent = <&ioapic1>; 25 ctrl-reg = <2>; 26 freq-reg = <0x26>; 27 reg = <1 0x70 2>; 28 }; 29