rtc: at91sam9: add DT bindings documentation

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>

diff --git a/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt b/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt
new file mode 100644 (file)
index 0000000..6ae79d1
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt
@@ -0,0 +1,23 @@
+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>;
+};