arch/arm/boot/dts/arm/integratorap.dts

Source file repositories/reference/linux-study-clean/arch/arm/boot/dts/arm/integratorap.dts

File Facts

System
Linux kernel
Corpus path
arch/arm/boot/dts/arm/integratorap.dts
Extension
.dts
Size
7957 bytes
Lines
288
Domain
Architecture Layer
Bucket
arch/arm
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
/*
 * Device Tree for the ARM Integrator/AP platform
 */

/dts-v1/;
#include "integrator.dtsi"
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/input/input.h>

/ {
	model = "ARM Integrator/AP";
	compatible = "arm,integrator-ap";

	cpus {
		#address-cells = <1>;
		#size-cells = <0>;

		cpu@0 {
			device_type = "cpu";
			/*
			 * Since the board has pluggable CPU modules, we
			 * cannot define a proper compatible here. Let the
			 * boot loader fill in the apropriate compatible
			 * string if necessary.
			 */
			/* compatible = "arm,arm926ej-s"; */
			reg = <0>;
			/*
			 * The documentation in ARM DUI 0138E page 3-12 states
			 * that the maximum frequency for this clock is 200 MHz
			 * but painful trial-and-error has proved to me that it
			 * is actually just hanging the system above 71 MHz.
			 * Sad but true.
			 */
					 /* kHz     uV   */
			operating-points = <71000  0
					    66000  0
					    60000  0
					    48000  0
					    36000  0
					    24000  0
					    12000  0>;
			clocks = <&cmosc>;
			clock-names = "cpu";
			clock-latency = <1000000>; /* 1 ms */
		};
	};

	aliases {
		arm,timer-primary = &timer2;
		arm,timer-secondary = &timer1;
	};

	chosen {
		bootargs = "root=/dev/ram0 console=ttyAM0,38400n8 earlyprintk";
	};

	/* 24 MHz chrystal on the Integrator/AP development board */
	xtal24mhz: pclk: clock-24000000 {
		#clock-cells = <0>;
		compatible = "fixed-clock";
		clock-frequency = <24000000>;
	};

	/* The UART clock is 14.74 MHz divided by an ICS525 */
	uartclk: clock-14745600 {
		#clock-cells = <0>;
		compatible = "fixed-clock";
		clock-frequency = <14745600>;

Annotation

Implementation Notes