The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/rtc/atmel,at91sam9-rtc.txt

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    1 Atmel AT91SAM9260 Real Time Timer
    2 
    3 Required properties:
    4 - compatible: should be one of the following:
    5         - "atmel,at91sam9260-rtt"
    6         - "microchip,sam9x60-rtt", "atmel,at91sam9260-rtt"
    7 - reg: should encode the memory region of the RTT controller
    8 - interrupts: rtt alarm/event interrupt
    9 - clocks: should contain the 32 KHz slow clk that will drive the RTT block.
   10 - atmel,rtt-rtc-time-reg: should encode the GPBR register used to store
   11         the time base when the RTT is used as an RTC.
   12         The first cell should point to the GPBR node and the second one
   13         encode the offset within the GPBR block (or in other words, the
   14         GPBR register used to store the time base).
   15 
   16 
   17 Example:
   18 
   19 rtt@fffffd20 {
   20         compatible = "atmel,at91sam9260-rtt";
   21         reg = <0xfffffd20 0x10>;
   22         interrupts = <1 4 7>;
   23         clocks = <&clk32k>;
   24         atmel,rtt-rtc-time-reg = <&gpbr 0x0>;
   25 };

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