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Rafael J. Wysocki
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Dec 7, 2012
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--- | ||
refs/heads/master: 5e7779f0395833d80d8fa15933737c8dc48759ec | ||
refs/heads/master: 583bdc59820692eead7868e816d08bee4c55c1c6 |
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Whatt: /sys/devices/.../sun | ||
Date: October 2012 | ||
Contact: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> | ||
Description: | ||
The file contains a Slot-unique ID which provided by the _SUN | ||
method in the ACPI namespace. The value is written in Advanced | ||
Configuration and Power Interface Specification as follows: | ||
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"The _SUN value is required to be unique among the slots of | ||
the same type. It is also recommended that this number match | ||
the slot number printed on the physical slot whenever possible." | ||
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So reading the sysfs file, we can identify a physical position | ||
of the slot in the system. |
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trunk/Documentation/devicetree/bindings/cpufreq/cpufreq-spear.txt
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SPEAr cpufreq driver | ||
------------------- | ||
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SPEAr SoC cpufreq driver for CPU frequency scaling. | ||
It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) systems | ||
which share clock across all CPUs. | ||
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Required properties: | ||
- cpufreq_tbl: Table of frequencies CPU could be transitioned into, in the | ||
increasing order. | ||
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Optional properties: | ||
- clock-latency: Specify the possible maximum transition latency for clock, in | ||
unit of nanoseconds. | ||
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Both required and optional properties listed above must be defined under node | ||
/cpus/cpu@0. | ||
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Examples: | ||
-------- | ||
cpus { | ||
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<...> | ||
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cpu@0 { | ||
compatible = "arm,cortex-a9"; | ||
reg = <0>; | ||
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<...> | ||
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cpufreq_tbl = < 166000 | ||
200000 | ||
250000 | ||
300000 | ||
400000 | ||
500000 | ||
600000 >; | ||
}; | ||
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<...> | ||
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}; |
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