mediatek: mt7981: add reserved memory to support pstore

Add reserved memory for pstore/ramoops to device tree used by Linux
as well as U-Boot.

Signed-off-by: Alexander Couzens <[email protected]>
Signed-off-by: Daniel Golle <[email protected]>

package/boot/uboot-mediatek/patches/052-mt7981-enable-pstore.patch

@@ -0,0 +1,38 @@
+--- a/arch/arm/dts/mt7981.dtsi
++++ b/arch/arm/dts/mt7981.dtsi
+@@ -32,6 +32,35 @@
+ 		};
+ 	};
+ 
++	psci {
++		compatible  = "arm,psci-0.2";
++		method      = "smc";
++	};
++
++	reserved-memory {
++		#address-cells = <2>;
++		#size-cells = <2>;
++		ranges;
++
++		/* 64 KiB reserved for ramoops/pstore */
++		ramoops@42ff0000 {
++			compatible = "ramoops";
++			reg = <0 0x42ff0000 0 0x10000>;
++			record-size = <0x1000>;
++		};
++
++		/* 192 KiB reserved for ARM Trusted Firmware (BL31) */
++		secmon_reserved: secmon@43000000 {
++			reg = <0 0x43000000 0 0x30000>;
++			no-map;
++		};
++
++		wmcpu_emi: wmcpu-reserved@4fc00000 {
++			no-map;
++			reg = <0 0x4fc00000 0 0x00100000>;
++		};
++	};
++
+ 	gpt_clk: gpt_dummy20m {
+ 		compatible = "fixed-clock";
+ 		clock-frequency = <13000000>;

target/linux/mediatek/files-5.15/arch/arm64/boot/dts/mediatek/mt7981.dtsi

@@ -164,6 +164,13 @@
 		#size-cells = <2>;
 		ranges;
 
+		/* 64 KiB reserved for ramoops/pstore */
+		ramoops@42ff0000 {
+			compatible = "ramoops";
+			reg = <0 0x42ff0000 0 0x10000>;
+			record-size = <0x1000>;
+		};
+
 		/* 192 KiB reserved for ARM Trusted Firmware (BL31) */
 		secmon_reserved: secmon@43000000 {
 			reg = <0 0x43000000 0 0x30000>;