Add RTT bindings documentation.
Signed-off-by: Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
Acked-by: Johan Hovold <johan@xxxxxxxxxx>
---
.../devicetree/bindings/rtc/atmel,at91sam9-rtc.txt | 23 ++++++++++++++++++++++
1 file changed, 23 insertions(+)
create mode 100644 Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt
diff --git a/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt b/Documentation/devicetree/bindings/rtc/atmel,at91sam9-rtc.txt
new file mode 100644
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>;
+};
--
1.9.1
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