linux-kernel - [PATCH v2 4/4] arm64: dts: amlogic: a1: setup CPU power management

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Date: Fri, 10 May 2024 12:12:26 +0300
From: Dmitry Rokosov <ddrokosov@...utedevices.com>
To: <neil.armstrong@...aro.org>, <jbrunet@...libre.com>,
	<mturquette@...libre.com>, <sboyd@...nel.org>, <robh+dt@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <khilman@...libre.com>,
	<martin.blumenstingl@...glemail.com>
CC: <kernel@...utedevices.com>, <rockosov@...il.com>,
	<linux-amlogic@...ts.infradead.org>, <linux-clk@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, Dmitry Rokosov
	<ddrokosov@...utedevices.com>
Subject: [PATCH v2 4/4] arm64: dts: amlogic: a1: setup CPU power management

The Amlogic A1 SoC family utilizes static operating points and a
PWM-controlled core voltage regulator, which is specific to the board.
As the main CPU clock input, the SoC uses CLKID_CPU_CLK from the CPU
clock controller, which can be inherited from the system PLL (syspll) or
a fixed CPU clock.

Currently, the stable operating points at all frequencies are set to
800mV. This value is obtained from the vendor setup of several A1
boards.

Signed-off-by: Dmitry Rokosov <ddrokosov@...utedevices.com>
---
 arch/arm64/boot/dts/amlogic/meson-a1.dtsi | 44 +++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/arch/arm64/boot/dts/amlogic/meson-a1.dtsi b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
index 785778f3a7da..fa13dd6ed03d 100644
--- a/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-a1.dtsi
@@ -33,6 +33,13 @@ cpu0: cpu@0 {
 			reg = <0x0 0x0>;
 			enable-method = "psci";
 			next-level-cache = <&l2>;
+			clocks = <&clkc_cpu CLKID_CPU_CLK>;
+			clock-names = "core_clk";
+			operating-points-v2 = <&cpu_opp_table0>;
+			voltage-tolerance = <0>;
+			clock-latency = <50000>;
+			capacity-dmips-mhz = <400>;
+			dynamic-power-coefficient = <80>;
 			#cooling-cells = <2>;
 		};
 
@@ -42,6 +49,13 @@ cpu1: cpu@1 {
 			reg = <0x0 0x1>;
 			enable-method = "psci";
 			next-level-cache = <&l2>;
+			clocks = <&clkc_cpu CLKID_CPU_CLK>;
+			clock-names = "core_clk";
+			operating-points-v2 = <&cpu_opp_table0>;
+			voltage-tolerance = <0>;
+			clock-latency = <50000>;
+			capacity-dmips-mhz = <400>;
+			dynamic-power-coefficient = <80>;
 			#cooling-cells = <2>;
 		};
 
@@ -52,6 +66,36 @@ l2: l2-cache0 {
 		};
 	};
 
+	cpu_opp_table0: cpu_opp_table0 {
+		compatible = "operating-points-v2";
+		opp-shared;
+
+		opp00 {
+			opp-hz = /bits/ 64 <128000000>;
+			opp-microvolt = <800000>;
+		};
+		opp01 {
+			opp-hz = /bits/ 64 <256000000>;
+			opp-microvolt = <800000>;
+		};
+		opp02 {
+			opp-hz = /bits/ 64 <512000000>;
+			opp-microvolt = <800000>;
+		};
+		opp03 {
+			opp-hz = /bits/ 64 <768000000>;
+			opp-microvolt = <800000>;
+		};
+		opp04 {
+			opp-hz = /bits/ 64 <1008000000>;
+			opp-microvolt = <800000>;
+		};
+		opp05 {
+			opp-hz = /bits/ 64 <1200000000>;
+			opp-microvolt = <800000>;
+		};
+	};
+
 	efuse: efuse {
 		compatible = "amlogic,meson-gxbb-efuse";
 		clocks = <&clkc_periphs CLKID_OTP>;
-- 
2.43.0