[PATCH v2 21/22] arm64: dts: apple: t8010: Add cpufreq nodes

[Nick Chan <towinchenmi@xxxxxxxxx>]

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@xxxxxxxxx>
---
 arch/arm64/boot/dts/apple/t8010-fast.dtsi | 22 ++++++++
 arch/arm64/boot/dts/apple/t8010.dtsi      | 67 +++++++++++++++++++++++
 2 files changed, 89 insertions(+)

diff --git a/arch/arm64/boot/dts/apple/t8010-fast.dtsi b/arch/arm64/boot/dts/apple/t8010-fast.dtsi
index 4bdf1c3eccfe..b5a2c78ca9e9 100644
--- a/arch/arm64/boot/dts/apple/t8010-fast.dtsi
+++ b/arch/arm64/boot/dts/apple/t8010-fast.dtsi
@@ -6,3 +6,25 @@
  */
 
 #include "t8010.dtsi"
+
+/ {
+	opp: opp-table {
+		opp08 {
+			opp-hz = /bits/ 64 <1944000000>;
+			opp-level = <8>;
+			opp-microvolt = <816000>;
+		};
+
+		opp09 {
+			opp-hz = /bits/ 64 <2244000000>;
+			opp-level = <9>;
+			opp-microvolt = <922000>;
+		};
+
+		opp10 {
+			opp-hz = /bits/ 64 <2340000000>;
+			opp-level = <10>;
+			opp-microvolt = <922000>;
+		};
+	};
+};
diff --git a/arch/arm64/boot/dts/apple/t8010.dtsi b/arch/arm64/boot/dts/apple/t8010.dtsi
index 926a0f501477..e27d2b5e3df1 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 +60,70 @@ 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 {
+		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>;
+			opp-microvolt = <525000>;
+		};
+
+		opp02 {
+			opp-hz = /bits/ 64 <275000000>; /* 732 MHz, E-core */
+			opp-level = <2>;
+			opp-microvolt = <541000>;
+		};
+
+		opp03 {
+			opp-hz = /bits/ 64 <410000000>; /* 1092 MHz, E-core */
+			opp-level = <3>;
+			opp-microvolt = <603000>;
+		};
+
+		/* The following operating points are handled by the P-cores */
+		opp04 {
+			opp-hz = /bits/ 64 <756000000>;
+			opp-level = <4>;
+			opp-microvolt = <559000>;
+		};
+
+		opp05 {
+			opp-hz = /bits/ 64 <1056000000>;
+			opp-level = <5>;
+			opp-microvolt = <609000>;
+		};
+
+		opp06 {
+			opp-hz = /bits/ 64 <1356000000>;
+			opp-level = <6>;
+			opp-microvolt = <650000>;
+		};
+
+		opp07 {
+			opp-hz = /bits/ 64 <1644000000>;
+			opp-level = <7>;
+			opp-microvolt = <725000>;
+		};
+
+		/*
+		 * The iPod touch 7 supports up to 1.6 GHz, faster operating
+		 * points for other devices are in t8010-fast.dtsi
+		 */
+	};
+
 	memory@800000000 {
 		device_type = "memory";
 		reg = <0x8 0 0 0>; /* To be filled by loader */
@@ -86,6 +147,12 @@ soc {
 		nonposted-mmio;
 		ranges;
 
+		cpufreq: performance-controller@202f20000 {
+			compatible = "apple,t8010-cluster-cpufreq", "apple,t8103-cluster-cpufreq", "apple,cluster-cpufreq";
+			reg = <0x2 0x2f20000 0 0x1000>;
+			#performance-domain-cells = <0>;
+		};
+
 		serial0: serial@20a0c0000 {
 			compatible = "apple,s5l-uart";
 			reg = <0x2 0x0a0c0000 0x0 0x4000>;
-- 
2.46.0