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arm64: dts: rockchip: Add rk3528 CPU frequency scaling support

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By default, the CPUs on RK3528 operates at 1.5GHz. Add CPU frequency and
voltage mapping to the device tree to enable dynamic scaling via cpufreq.

The OPP values come from downstream kernel[1], using a voltage close to
the actual frequency. Frequencies below 1.2GHz have been removed due to
the same voltage.

[1] https://github.com/rockchip-linux/kernel/blob/develop-5.10/arch/arm64/boot/dts/rockchip/rk3528.dtsi

Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Link: https://lore.kernel.org/r/20250801080025.558935-2-amadeus@jmu.edu.cn
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Chukun Pan 2025-08-01 16:00:25 +08:00 committed by Heiko Stuebner
parent fdab018643
commit 42bbc32c7e
1 changed files with 39 additions and 0 deletions
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39
arch/arm64/boot/dts/rockchip/rk3528.dtsi
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@ -54,6 +54,7 @@ cpu0: cpu@0 {
device_type = "cpu";
enable-method = "psci";
clocks = <&scmi_clk SCMI_CLK_CPU>;
operating-points-v2 = <&cpu_opp_table>;
};
cpu1: cpu@1 {
@ -62,6 +63,7 @@ cpu1: cpu@1 {
device_type = "cpu";
enable-method = "psci";
clocks = <&scmi_clk SCMI_CLK_CPU>;
operating-points-v2 = <&cpu_opp_table>;
};
cpu2: cpu@2 {
@ -70,6 +72,7 @@ cpu2: cpu@2 {
device_type = "cpu";
enable-method = "psci";
clocks = <&scmi_clk SCMI_CLK_CPU>;
operating-points-v2 = <&cpu_opp_table>;
};
cpu3: cpu@3 {
@ -78,6 +81,7 @@ cpu3: cpu@3 {
device_type = "cpu";
enable-method = "psci";
clocks = <&scmi_clk SCMI_CLK_CPU>;
operating-points-v2 = <&cpu_opp_table>;
};
};
@ -96,6 +100,41 @@ scmi_clk: protocol@14 {
};
};
cpu_opp_table: opp-table-cpu {
compatible = "operating-points-v2";
opp-shared;
opp-1200000000 {
opp-hz = /bits/ 64 <1200000000>;
opp-microvolt = <875000 875000 1100000>;
clock-latency-ns = <40000>;
};
opp-1416000000 {
opp-hz = /bits/ 64 <1416000000>;
opp-microvolt = <925000 925000 1100000>;
clock-latency-ns = <40000>;
};
opp-1608000000 {
opp-hz = /bits/ 64 <1608000000>;
opp-microvolt = <975000 975000 1100000>;
clock-latency-ns = <40000>;
};
opp-1800000000 {
opp-hz = /bits/ 64 <1800000000>;
opp-microvolt = <1037500 1037500 1100000>;
clock-latency-ns = <40000>;
};
opp-2016000000 {
opp-hz = /bits/ 64 <2016000000>;
opp-microvolt = <1100000 1100000 1100000>;
clock-latency-ns = <40000>;
};
};
gpu_opp_table: opp-table-gpu {
compatible = "operating-points-v2";