arm64: dts: allwinner: h616: Add CPU OPPs table

Add an Operating Performance Points table for the CPU cores to enable
Dynamic Voltage & Frequency Scaling (DVFS) on the H616.
The values were taken from the BSP sources. There is a separate OPP set
seen on some H700 devices, but they didn't really work out in testing, so
they are not included for now.

Also add the needed cpu_speed_grade nvmem cell and the cooling cells
properties, to enable passive cooling.

Signed-off-by: Martin Botka <martin.botka@somainline.org>
[Andre: rework to minimise opp-microvolt properties]
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

arch/arm64/boot/dts/allwinner/sun50i-h616-cpu-opp.dtsi

@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+// Copyright (C) 2023 Martin Botka <martin@somainline.org>
+
+/ {
+	cpu_opp_table: opp-table-cpu {
+		compatible = "allwinner,sun50i-h616-operating-points";
+		nvmem-cells = <&cpu_speed_grade>;
+		opp-shared;
+
+		opp-480000000 {
+			opp-hz = /bits/ 64 <480000000>;
+			opp-microvolt = <900000>;
+			clock-latency-ns = <244144>; /* 8 32k periods */
+			opp-supported-hw = <0x1f>;
+		};
+
+		opp-600000000 {
+			opp-hz = /bits/ 64 <600000000>;
+			opp-microvolt = <900000>;
+			clock-latency-ns = <244144>; /* 8 32k periods */
+			opp-supported-hw = <0x12>;
+		};
+
+		opp-720000000 {
+			opp-hz = /bits/ 64 <720000000>;
+			opp-microvolt = <900000>;
+			clock-latency-ns = <244144>; /* 8 32k periods */
+			opp-supported-hw = <0x0d>;
+		};
+
+		opp-792000000 {
+			opp-hz = /bits/ 64 <792000000>;
+			opp-microvolt-speed1 = <900000>;
+			opp-microvolt-speed4 = <940000>;
+			clock-latency-ns = <244144>; /* 8 32k periods */
+			opp-supported-hw = <0x12>;
+		};
+
+		opp-936000000 {
+			opp-hz = /bits/ 64 <936000000>;
+			opp-microvolt = <900000>;
+			clock-latency-ns = <244144>; /* 8 32k periods */
+			opp-supported-hw = <0x0d>;
+		};
+
+		opp-1008000000 {
+			opp-hz = /bits/ 64 <1008000000>;
+			opp-microvolt-speed0 = <950000>;
+			opp-microvolt-speed1 = <940000>;
+			opp-microvolt-speed2 = <950000>;
+			opp-microvolt-speed3 = <950000>;
+			opp-microvolt-speed4 = <1020000>;
+			clock-latency-ns = <244144>; /* 8 32k periods */
+			opp-supported-hw = <0x1f>;
+		};
+
+		opp-1104000000 {
+			opp-hz = /bits/ 64 <1104000000>;
+			opp-microvolt-speed0 = <1000000>;
+			opp-microvolt-speed2 = <1000000>;
+			opp-microvolt-speed3 = <1000000>;
+			clock-latency-ns = <244144>; /* 8 32k periods */
+			opp-supported-hw = <0x0d>;
+		};
+
+		opp-1200000000 {
+			opp-hz = /bits/ 64 <1200000000>;
+			opp-microvolt-speed0 = <1050000>;
+			opp-microvolt-speed1 = <1020000>;
+			opp-microvolt-speed2 = <1050000>;
+			opp-microvolt-speed3 = <1050000>;
+			opp-microvolt-speed4 = <1100000>;
+			clock-latency-ns = <244144>; /* 8 32k periods */
+			opp-supported-hw = <0x1f>;
+		};
+
+		opp-1320000000 {
+			opp-hz = /bits/ 64 <1320000000>;
+			opp-microvolt = <1100000>;
+			clock-latency-ns = <244144>; /* 8 32k periods */
+			opp-supported-hw = <0x1d>;
+		};
+
+		opp-1416000000 {
+			opp-hz = /bits/ 64 <1416000000>;
+			opp-microvolt = <1100000>;
+			clock-latency-ns = <244144>; /* 8 32k periods */
+			opp-supported-hw = <0x0d>;
+		};
+
+		opp-1512000000 {
+			opp-hz = /bits/ 64 <1512000000>;
+			opp-microvolt-speed1 = <1100000>;
+			opp-microvolt-speed3 = <1100000>;
+			clock-latency-ns = <244144>; /* 8 32k periods */
+			opp-supported-hw = <0x0a>;
+		};
+	};
+};
+
+&cpu0 {
+	operating-points-v2 = <&cpu_opp_table>;
+};
+
+&cpu1 {
+	operating-points-v2 = <&cpu_opp_table>;
+};
+
+&cpu2 {
+	operating-points-v2 = <&cpu_opp_table>;
+};
+
+&cpu3 {
+	operating-points-v2 = <&cpu_opp_table>;
+};

arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi

@@ -26,6 +26,7 @@
 			reg = <0>;
 			enable-method = "psci";
 			clocks = <&ccu CLK_CPUX>;
+			#cooling-cells = <2>;
 		};
 
 		cpu1: cpu@1 {
@@ -34,6 +35,7 @@
 			reg = <1>;
 			enable-method = "psci";
 			clocks = <&ccu CLK_CPUX>;
+			#cooling-cells = <2>;
 		};
 
 		cpu2: cpu@2 {
@@ -42,6 +44,7 @@
 			reg = <2>;
 			enable-method = "psci";
 			clocks = <&ccu CLK_CPUX>;
+			#cooling-cells = <2>;
 		};
 
 		cpu3: cpu@3 {
@@ -50,6 +53,7 @@
 			reg = <3>;
 			enable-method = "psci";
 			clocks = <&ccu CLK_CPUX>;
+			#cooling-cells = <2>;
 		};
 	};
 
@@ -156,6 +160,10 @@
 			ths_calibration: thermal-sensor-calibration@14 {
 				reg = <0x14 0x8>;
 			};
+
+			cpu_speed_grade: cpu-speed-grade@0 {
+				reg = <0x0 2>;
+			};
 		};
 
 		watchdog: watchdog@30090a0 {