Writing this bit can be handled by the syscon-reboot driver.
Add this node to DT.

Signed-off-by: Andrew Davis <redacted>
Reviewed-by: Linus Walleij <redacted>
Tested-by: Fabian Vogt <redacted>
Reviewed-by: Fabian Vogt <redacted>
---
 arch/arm/boot/dts/nspire/nspire.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/nspire/nspire.dtsi b/arch/arm/boot/dts/nspire/nspire.dtsi
index bb240e6a3a6f1..48fbc9d533c39 100644
--- a/arch/arm/boot/dts/nspire/nspire.dtsi
+++ b/arch/arm/boot/dts/nspire/nspire.dtsi

@@ -172,7 +172,14 @@ rtc: rtc@90090000 {
 			};
 
 			misc: misc@900a0000 {
+				compatible = "ti,nspire-misc", "syscon", "simple-mfd";
 				reg = <0x900a0000 0x1000>;
+
+				reboot {
+					compatible = "syscon-reboot";
+					offset = <0x08>;
+					value = <0x02>;
+				};
 			};
 
 			pwr: pwr@900b0000 {

-- 
2.39.2