[PATCH] arm64: dts: mediatek: mt7981b: Add PMU

[Peter Collingbourne]

The interrupt number was taken from a downstream DTS of the similar MT7987
[1] and verified on my OpenWrt One.

Signed-off-by: Peter Collingbourne <peter at pcc.me.uk>
Link: [1] https://github.com/openwrt/openwrt/blob/e4b3d5c799aef3be20b7f6079e8e5a14b215c116/target/linux/mediatek/dts/mt7987.dtsi#L246
---
 arch/arm64/boot/dts/mediatek/mt7981b.dtsi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt7981b.dtsi b/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
index 4084f4dfa3e5..3c6fbb6c5333 100644
--- a/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
@@ -38,6 +38,12 @@ oscillator-40m {
 		#clock-cells = <0>;
 	};
 
+	pmu {
+		compatible = "arm,cortex-a53-pmu";
+		interrupt-parent = <&gic>;
+		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW>;
+	};
+
 	psci {
 		compatible = "arm,psci-1.0";
 		method = "smc";
-- 
2.54.0