arch/arm64/boot/dts/apple/s8000.dtsi

Source file repositories/reference/linux-study-clean/arch/arm64/boot/dts/apple/s8000.dtsi

File Facts

System
Linux kernel
Corpus path
arch/arm64/boot/dts/apple/s8000.dtsi
Extension
.dtsi
Size
1427 bytes
Lines
69
Domain
Architecture Layer
Bucket
arch/arm64
Inferred role
Architecture Layer: configuration, schema, or hardware description
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0+ OR MIT
/*
 * Apple S8000 "A9" (Samsung) SoC
 *
 * Other names: H8P, "Maui"
 *
 * Copyright (c) 2024, Nick Chan <towinchenmi@gmail.com>
 */

#include "s800-0-3.dtsi"

/ {
	twister_opp: opp-table {
		compatible = "operating-points-v2";

		opp01 {
			opp-hz = /bits/ 64 <300000000>;
			opp-level = <1>;
			clock-latency-ns = <650>;
		};
		opp02 {
			opp-hz = /bits/ 64 <396000000>;
			opp-level = <2>;
			clock-latency-ns = <75000>;
		};
		opp03 {
			opp-hz = /bits/ 64 <600000000>;
			opp-level = <3>;
			clock-latency-ns = <27000>;
		};
		opp04 {
			opp-hz = /bits/ 64 <912000000>;
			opp-level = <4>;
			clock-latency-ns = <32000>;
		};
		opp05 {
			opp-hz = /bits/ 64 <1200000000>;
			opp-level = <5>;
			clock-latency-ns = <35000>;
		};
		opp06 {
			opp-hz = /bits/ 64 <1512000000>;
			opp-level = <6>;
			clock-latency-ns = <45000>;
		};
		opp07 {
			opp-hz = /bits/ 64 <1800000000>;
			opp-level = <7>;
			clock-latency-ns = <58000>;
		};
#if 0
		/* Not available until CPU deep sleep is implemented */
		opp08 {
			opp-hz = /bits/ 64 <1844000000>;
			opp-level = <8>;
			clock-latency-ns = <58000>;
			turbo-mode;
		};
#endif
	};
};

/*
 * The A9 was made by two separate fabs on two different process
 * nodes: Samsung made the S8000 (APL0898) on 14nm and TSMC made
 * the S8003 (APL1022) on 16nm. There are some minor differences
 * such as timing in cpufreq state transistions.
 */

Annotation

Implementation Notes