linux-kernel - [PATCH 21/22] arm64: dts: apple: t8010: Add cpufreq nodes

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Message-ID: <20240911084353.28888-23-towinchenmi@gmail.com>
Date: Wed, 11 Sep 2024 16:41:11 +0800
From: Nick Chan <towinchenmi@...il.com>
To: Hector Martin <marcan@...can.st>,
	Sven Peter <sven@...npeter.dev>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Wim Van Sebroeck <wim@...ux-watchdog.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Mark Kettenis <kettenis@...nbsd.org>,
	asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	linux-watchdog@...r.kernel.org
Cc: Konrad Dybcio <konradybcio@...nel.org>,
	Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>,
	Nick Chan <towinchenmi@...il.com>
Subject: [PATCH 21/22] arm64: dts: apple: t8010: Add cpufreq nodes

Add cpufreq nodes for the A10 SoC.

The Apple iPod touch 7 can only go up to 1.64 GHz, so the higher operating
points are in t8010-fast.dtsi.

A10 consists of logical cores that switches between E-mode and P-mode
depending on the current p-state. Each mode have different capacities so
the E-mode frequencies are adjusted to make performance scale linearly
with clock speed.

Signed-off-by: Nick Chan <towinchenmi@...il.com>
---
 arch/arm64/boot/dts/apple/t8010-fast.dtsi | 19 +++++++
 arch/arm64/boot/dts/apple/t8010.dtsi      | 60 +++++++++++++++++++++++
 2 files changed, 79 insertions(+)

diff --git a/arch/arm64/boot/dts/apple/t8010-fast.dtsi b/arch/arm64/boot/dts/apple/t8010-fast.dtsi
index 4bdf1c3eccfe..9a263eadc776 100644
--- a/arch/arm64/boot/dts/apple/t8010-fast.dtsi
+++ b/arch/arm64/boot/dts/apple/t8010-fast.dtsi
@@ -6,3 +6,22 @@
  */
 
 #include "t8010.dtsi"
+
+/ {
+	opp: opp-table-0 {
+		opp08 {
+			opp-hz = /bits/ 64 <1944000000>;
+			opp-level = <8>;
+		};
+
+		opp09 {
+			opp-hz = /bits/ 64 <2244000000>;
+			opp-level = <9>;
+		};
+
+		opp10 {
+			opp-hz = /bits/ 64 <2340000000>;
+			opp-level = <10>;
+		};
+	};
+};
diff --git a/arch/arm64/boot/dts/apple/t8010.dtsi b/arch/arm64/boot/dts/apple/t8010.dtsi
index 926a0f501477..e7d7194b412c 100644
--- a/arch/arm64/boot/dts/apple/t8010.dtsi
+++ b/arch/arm64/boot/dts/apple/t8010.dtsi
@@ -50,6 +50,8 @@ cpu0: cpu@0 {
 			compatible = "apple,hurricane-zephyr";
 			reg = <0x0 0x0>;
 			cpu-release-addr = <0 0>; /* To be filled by loader */
+			operating-points-v2 = <&opp>;
+			performance-domains = <&cpufreq>;
 			enable-method = "spin-table";
 			device_type = "cpu";
 		};
@@ -58,11 +60,63 @@ cpu1: cpu@1 {
 			compatible = "apple,hurricane-zephyr";
 			reg = <0x0 0x1>;
 			cpu-release-addr = <0 0>; /* To be filled by loader */
+			operating-points-v2 = <&opp>;
+			performance-domains = <&cpufreq>;
 			enable-method = "spin-table";
 			device_type = "cpu";
 		};
 	};
 
+	opp: opp-table-0 {
+		compatible = "operating-points-v2";
+
+		/*
+		 * The E-core frequencies are adjusted so performance scales
+		 * linearly with reported clock speed.
+		 */
+
+		opp01 {
+			opp-hz = /bits/ 64 <149000000>; /* 396 MHz, E-core */
+			opp-level = <1>;
+		};
+
+		opp02 {
+			opp-hz = /bits/ 64 <275000000>; /* 732 MHz, E-core */
+			opp-level = <2>;
+		};
+
+		opp03 {
+			opp-hz = /bits/ 64 <410000000>; /* 1092 MHz, E-core */
+			opp-level = <3>;
+		};
+
+		/* The following operating points are handled by the P-cores */
+		opp04 {
+			opp-hz = /bits/ 64 <756000000>;
+			opp-level = <4>;
+		};
+
+		opp05 {
+			opp-hz = /bits/ 64 <1056000000>;
+			opp-level = <5>;
+		};
+
+		opp06 {
+			opp-hz = /bits/ 64 <1356000000>;
+			opp-level = <6>;
+		};
+
+		opp07 {
+			opp-hz = /bits/ 64 <1644000000>;
+			opp-level = <7>;
+		};
+
+		/*
+		 * The iPod Touch 7 supports up to 1.6 GHz, faster operating
+		 * points for other devices are in t8010-fast.dtsi
+		 */
+	};
+
 	memory@...000000 {
 		device_type = "memory";
 		reg = <0x8 0 0 0>; /* To be filled by loader */
@@ -86,6 +140,12 @@ soc {
 		nonposted-mmio;
 		ranges;
 
+		cpufreq: performance-controller@...f20000 {
+			compatible = "apple,t8010-cluster-cpufreq", "apple,t8103-cluster-cpufreq", "apple,cluster-cpufreq";
+			reg = <0x2 0x2f20000 0 0x1000>;
+			#performance-domain-cells = <0>;
+		};
+
 		serial0: serial@...0c0000 {
 			compatible = "apple,s5l-uart";
 			reg = <0x2 0x0a0c0000 0x0 0x4000>;
-- 
2.46.0