2026-01-21 18:59:54 +08:00
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Motorola mc146818 compatible RTC
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Required properties:
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- compatible : "motorola,mc146818"
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- reg : should contain registers location and length.
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Optional properties:
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- interrupts : should contain interrupt.
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- ctrl-reg : Contains the initial value of the control register also
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called "Register B".
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- freq-reg : Contains the initial value of the frequency register also
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2026-01-29 22:25:33 +08:00
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called "Register A".
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2026-01-21 18:59:54 +08:00
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"Register A" and "B" are usually initialized by the firmware (BIOS for
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instance). If this is not done, it can be performed by the driver.
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ISA Example:
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rtc@70 {
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compatible = "motorola,mc146818";
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interrupts = <8 3>;
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interrupt-parent = <&ioapic1>;
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ctrl-reg = <2>;
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freq-reg = <0x26>;
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reg = <1 0x70 2>;
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};
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