[PATCH] Fix Linux reboot on MT7988 using EFI and PSCI

[EasyNetDev]

Signed-off-by: EasyNetDev <devel at easynet.dev>

I'm proposing adding PSCI in DTS for MT7988 SoC which solves the problem
when U-Boot is compiled with CONFIG_PSCI_RESET=y.
If this code in DTS is missing and the system is using U-Boot EFI -> GRUB EFI -> Linux Kernel,
then the Linux kernel is not able to reboot the board on systemctl reboot.

This simple code fixes this issue.

---
 arch/arm/dts/mt7988.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/dts/mt7988.dtsi b/arch/arm/dts/mt7988.dtsi
index 2d57c6f5709..e907cf89396 100644
--- a/arch/arm/dts/mt7988.dtsi
+++ b/arch/arm/dts/mt7988.dtsi
@@ -51,6 +51,11 @@
 		};
 	};
 
+	psci {
+		compatible  = "arm,psci-0.2";
+		method      = "smc";
+	};
+
 	system_clk: dummy40m {
 		compatible = "fixed-clock";
 		clock-frequency = <40000000>;
-- 
2.51.0