Commit 1174a469 authored by Nick Chan's avatar Nick Chan Committed by Sven Peter
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arm64: dts: apple: t8011: Add cpufreq nodes 



Add cpufreq nodes for Apple A10 SoC. There is a transparent hardware
big.LITTLE switcher in this SoC. Spoof E-core p-state frequencies such
that CPU capacity does not appear to change when switching between core
types.

Signed-off-by: default avatarNick Chan <towinchenmi@gmail.com>
Reviewed-by: default avatarNeal Gompa <neal@gompa.dev>
Signed-off-by: default avatarSven Peter <sven@svenpeter.dev>
parent 029e1d60

arch/arm64/boot/dts/apple/t8011.dtsi

+79 −0
Original line number Diff line number Diff line
@@ -32,6 +32,8 @@ cpu0: cpu@0 { 
			compatible = "apple,hurricane-zephyr";

			reg = <0x0 0x0>;

			cpu-release-addr = <0 0>; /* To be filled by loader */

			operating-points-v2 = <&fusion_opp>;

			performance-domains = <&cpufreq>;

			enable-method = "spin-table";

			device_type = "cpu";

		};
@@ -40,6 +42,8 @@ cpu1: cpu@1 { 
			compatible = "apple,hurricane-zephyr";

			reg = <0x0 0x1>;

			cpu-release-addr = <0 0>; /* To be filled by loader */

			operating-points-v2 = <&fusion_opp>;

			performance-domains = <&cpufreq>;

			enable-method = "spin-table";

			device_type = "cpu";

		};
@@ -48,11 +52,80 @@ cpu2: cpu@2 { 
			compatible = "apple,hurricane-zephyr";

			reg = <0x0 0x2>;

			cpu-release-addr = <0 0>; /* To be filled by loader */

			operating-points-v2 = <&fusion_opp>;

			performance-domains = <&cpufreq>;

			enable-method = "spin-table";

			device_type = "cpu";

		};

	};



	fusion_opp: opp-table {

		compatible = "operating-points-v2";



		/*

		 * Apple Fusion Architecture: Hardwired big.LITTLE switcher

		 * that use p-state transitions to switch between cores.

		 *

		 * The E-core frequencies are adjusted so performance scales

		 * linearly with reported clock speed.

		 */



		opp01 {

			opp-hz = /bits/ 64 <172000000>; /* 300 MHz, E-core */

			opp-level = <1>;

			clock-latency-ns = <12000>;

		};

		opp02 {

			opp-hz = /bits/ 64 <230000000>; /* 396 MHz, E-core */

			opp-level = <2>;

			clock-latency-ns = <135000>;

		};

		opp03 {

			opp-hz = /bits/ 64 <448000000>; /* 768 MHz, E-core */

			opp-level = <3>;

			clock-latency-ns = <105000>;

		};

		opp04 {

			opp-hz = /bits/ 64 <662000000>; /* 1152 MHz, E-core */

			opp-level = <4>;

			clock-latency-ns = <115000>;

		};

		opp05 {

			opp-hz = /bits/ 64 <804000000>;

			opp-level = <5>;

			clock-latency-ns = <122000>;

		};

		opp06 {

			opp-hz = /bits/ 64 <1140000000>;

			opp-level = <6>;

			clock-latency-ns = <120000>;

		};

		opp07 {

			opp-hz = /bits/ 64 <1548000000>;

			opp-level = <7>;

			clock-latency-ns = <125000>;

		};

		opp08 {

			opp-hz = /bits/ 64 <1956000000>;

			opp-level = <8>;

			clock-latency-ns = <135000>;

		};

		opp09 {

			opp-hz = /bits/ 64 <2316000000>;

			opp-level = <9>;

			clock-latency-ns = <140000>;

		};

#if 0

		/* Not available until CPU deep sleep is implemented */

		opp10 {

			opp-hz = /bits/ 64 <2400000000>;

			opp-level = <10>;

			clock-latency-ns = <140000>;

			turbo-mode;

		};

#endif

	};



	soc {

		compatible = "simple-bus";

		#address-cells = <2>;
@@ -60,6 +133,12 @@ soc { 
		nonposted-mmio;

		ranges;



		cpufreq: performance-controller@202f20000 {

			compatible = "apple,t8010-cluster-cpufreq", "apple,t8103-cluster-cpufreq", "apple,cluster-cpufreq";

			reg = <0x2 0x02f20000 0 0x1000>;

			#performance-domain-cells = <0>;

		};



		serial0: serial@20a0c0000 {

			compatible = "apple,s5l-uart";

			reg = <0x2 0x0a0c0000 0x0 0x4000>;