Add memory range handled by ARM Trusted Firmware

Signed-off-by: Sjoerd Simons <sjoerd@collabora.com>
---
 arch/arm64/boot/dts/mediatek/mt7981b.dtsi | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt7981b.dtsi b/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
index 6b024156fa7c5..b477375078ccd 100644
--- a/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
@@ -41,6 +41,18 @@ psci {
 		method = "smc";
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		/* 192 KiB reserved for ARM Trusted Firmware (BL31) */
+		secmon_reserved: secmon@43000000 {
+			reg = <0 0x43000000 0 0x30000>;
+			no-map;
+		};
+	};
+
 	soc {
 		compatible = "simple-bus";
 		ranges;

-- 
2.51.0