ARM: at91/dt: enable the RTT block on the sam9g20ek board

Enable the RTT and GPBR devices and specify the general purpose register
used to store the current time.

Enable wakeup on RTT event on the shutdown controller device.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/at91sam9g20ek_common.dtsi b/arch/arm/boot/dts/at91sam9g20ek_common.dtsi
index d2919108e92d..dfaacb113f2e 100644
--- a/arch/arm/boot/dts/at91sam9g20ek_common.dtsi
+++ b/arch/arm/boot/dts/at91sam9g20ek_common.dtsi
@@ -112,9 +112,23 @@
                                 };
                         };
 
+                        shdwc@fffffd10 {
+                                atmel,wakeup-counter = <10>;
+                                atmel,wakeup-rtt-timer;
+                        };
+
+                        rtc@fffffd20 {
+                                atmel,rtt-rtc-time-reg = <&gpbr 0x0>;
+                                status = "okay";
+                        };
+
                         watchdog@fffffd40 {
                                 status = "okay";
                         };
+
+                        gpbr: syscon@fffffd50 {
+                                status = "okay";
+                        };
                 };
 
                 nand0: nand@40000000 {