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rtc: at91sam9: add DT bindings documentation

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Add RTT bindings documentation.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Johan Hovold <johan@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
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Boris BREZILLON 2014-09-23 16:45:12 +02:00 committed by Nicolas Ferre
parent a975f47f6e
commit 2c91e61dc9
1 changed files with 23 additions and 0 deletions
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Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt Normal file
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Atmel AT91SAM9260 Real Time Timer
Required properties:
- compatible: should be: "atmel,at91sam9260-rtt"
- reg: should encode the memory region of the RTT controller
- interrupts: rtt alarm/event interrupt
- clocks: should contain the 32 KHz slow clk that will drive the RTT block.
- atmel,rtt-rtc-time-reg: should encode the GPBR register used to store
the time base when the RTT is used as an RTC.
The first cell should point to the GPBR node and the second one
encode the offset within the GPBR block (or in other words, the
GPBR register used to store the time base).
Example:
rtt@fffffd20 {
compatible = "atmel,at91sam9260-rtt";
reg = <0xfffffd20 0x10>;
interrupts = <1 4 7>;
clocks = <&clk32k>;
atmel,rtt-rtc-time-reg = <&gpbr 0x0>;
};