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Commit 2c91e61d authored by Boris Brezillon's avatar Boris Brezillon Committed by Nicolas Ferre
Browse files

rtc: at91sam9: add DT bindings documentation 



Add RTT bindings documentation.

Signed-off-by: default avatarBoris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: default avatarJohan Hovold <johan@kernel.org>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
parent a975f47f

Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt

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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>;

};