요약·해설과 원문, 전문 번역을 서로 분리했습니다. API 이름, symbol, source path는 원문 표기를 사용합니다.
1. 요약·해설
원문의 핵심 논리와 kernel programming 관점의 보충 설명입니다. 아래의 전문 번역과는 별도로 작성했습니다.
Hardware channels와 virtual clocks
sysfs-ptp:43-83Alarm·external timestamp·periodic output·pin counts와 physical/virtual clock operating mode를 관리합니다.
Programmable pins와 PPS capability
sysfs-ptp:84-105Pin function/channel assignment을 읽고 쓰며 host CPU용 PPS support 여부를 확인합니다.
External timestamps와 periodic output
sysfs-ptp:106-142External timestamp channels, FIFO event tuples, periodic waveform timing과 Linux PPS event delivery를 제어합니다.
2. 영어 원문 전체
번역 기준이 된 Linux v6.18.37 원문입니다. 줄 번호는 이 버전의 파일 좌표입니다.
원문 전체 펼치기
1
What: /sys/class/ptp/
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Date: September 2010
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This directory contains files and directories
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providing a standardized interface to the ancillary
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features of PTP hardware clocks.
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What: /sys/class/ptp/ptp<N>/
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Date: September 2010
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This directory contains the attributes of the Nth PTP
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hardware clock registered into the PTP class driver
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subsystem.
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What: /sys/class/ptp/ptp<N>/clock_name
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Date: September 2010
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This file contains the name of the PTP hardware clock
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as a human readable string. The purpose of this
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attribute is to provide the user with a "friendly
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name" and to help distinguish PHY based devices from
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MAC based ones. The string does not necessarily have
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to be any kind of unique id.
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What: /sys/class/ptp/ptp<N>/max_adjustment
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Date: September 2010
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This file contains the PTP hardware clock's maximum
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frequency adjustment value (a positive integer) in
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parts per billion.
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What: /sys/class/ptp/ptp<N>/max_vclocks
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Date: May 2021
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Contact: Yangbo Lu <yangbo.lu@nxp.com>
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Description:
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This file contains the maximum number of ptp vclocks.
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Write integer to re-configure it.
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What: /sys/class/ptp/ptp<N>/n_alarms
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Date: September 2010
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This file contains the number of periodic or one shot
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alarms offer by the PTP hardware clock.
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What: /sys/class/ptp/ptp<N>/n_external_timestamps
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Date: September 2010
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This file contains the number of external timestamp
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channels offered by the PTP hardware clock.
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What: /sys/class/ptp/ptp<N>/n_periodic_outputs
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Date: September 2010
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This file contains the number of programmable periodic
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output channels offered by the PTP hardware clock.
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What: /sys/class/ptp/ptp<N>/n_pins
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Date: March 2014
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This file contains the number of programmable pins
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offered by the PTP hardware clock.
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What: /sys/class/ptp/ptp<N>/n_vclocks
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Date: May 2021
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Contact: Yangbo Lu <yangbo.lu@nxp.com>
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Description:
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This file contains the number of virtual PTP clocks in
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use. By default, the value is 0 meaning that only the
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physical clock is in use. Setting the value creates
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the corresponding number of virtual clocks and causes
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the physical clock to become free running. Setting the
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value back to 0 deletes the virtual clocks and
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switches the physical clock back to normal, adjustable
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operation.
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What: /sys/class/ptp/ptp<N>/pins
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Date: March 2014
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This directory contains one file for each programmable
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pin offered by the PTP hardware clock. The file name
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is the hardware dependent pin name. Reading from this
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file produces two numbers, the assigned function (see
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the `PTP_PF_` enumeration values in linux/ptp_clock.h)
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and the channel number. The function and channel
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assignment may be changed by two writing numbers into
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the file.
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What: /sys/class/ptp/ptp<N>/pps_available
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Date: September 2010
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This file indicates whether the PTP hardware clock
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supports a Pulse Per Second to the host CPU. Reading
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"1" means that the PPS is supported, while "0" means
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not supported.
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What: /sys/class/ptp/ptp<N>/extts_enable
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Date: September 2010
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This write-only file enables or disables external
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timestamps. To enable external timestamps, write the
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channel index followed by a "1" into the file.
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To disable external timestamps, write the channel
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index followed by a "0" into the file.
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What: /sys/class/ptp/ptp<N>/fifo
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Date: September 2010
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This file provides timestamps on external events, in
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the form of three integers: channel index, seconds,
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and nanoseconds.
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What: /sys/class/ptp/ptp<N>/period
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Date: September 2010
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This write-only file enables or disables periodic
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outputs. To enable a periodic output, write five
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integers into the file: channel index, start time
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seconds, start time nanoseconds, period seconds, and
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period nanoseconds. To disable a periodic output, set
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all the seconds and nanoseconds values to zero.
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What: /sys/class/ptp/ptp<N>/pps_enable
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Date: September 2010
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Contact: Richard Cochran <richardcochran@gmail.com>
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Description:
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This write-only file enables or disables delivery of
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PPS events to the Linux PPS subsystem. To enable PPS
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events, write a "1" into the file. To disable events,
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write a "0" into the file.
3. 한국어 전문 번역
영어 원문의 문단 순서와 의미를 유지한 전체 번역입니다. 코드, 함수명, symbol과 URL은 원문 표기를 유지합니다.
PTP hardware-clock sysfs ABI: ptp
1-8| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ |
| Date | 2010년 9월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/` directory에는 PTP hardware clocks의 ancillary features에 대한 standardized interface를 제공하는 files와 directories가 들어 있습니다. |
PTP hardware-clock sysfs ABI: ptp<N>
9-16| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/ |
| Date | 2010년 9월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/` directory에는 PTP class-driver subsystem에 register된 N번째 PTP hardware clock의 attributes가 들어 있습니다. |
PTP hardware-clock sysfs ABI: clock name
17-27| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/clock_name |
| Date | 2010년 9월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/clock_name`은 PTP hardware clock의 human-readable name을 담습니다. Friendly name을 제공하고 PHY-based device와 MAC-based device를 구분하는 데 도움을 주며 unique ID일 필요는 없습니다. |
AttributeMeaning
clock_nameFriendly, not necessarily unique clock name
max_adjustmentMaximum positive adjustment in ppb
max_vclocksConfigurable virtual-clock maximum
User-facing identity와 frequency-control limit를 비교합니다.
PTP hardware-clock sysfs ABI: max adjustment
28-35| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/max_adjustment |
| Date | 2010년 9월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/max_adjustment`는 PTP hardware clock의 maximum frequency adjustment positive integer를 parts per billion 단위로 담습니다. |
PTP hardware-clock sysfs ABI: max vclocks
36-42| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/max_vclocks |
| Date | 2021년 5월 |
| KernelVersion | |
| Contact | Yangbo Lu <yangbo.lu@nxp.com> |
| Description | `/sys/class/ptp/ptp<N>/max_vclocks`는 maximum PTP virtual clocks 수를 담습니다. Integer를 쓰면 reconfigure합니다. |
PTP hardware-clock sysfs ABI: n alarms
43-49| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/n_alarms |
| Date | 2010년 9월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/n_alarms`는 PTP hardware clock이 제공하는 periodic 또는 one-shot alarms 수입니다. |
AttributeResource count
n_alarmsPeriodic or one-shot alarms
n_external_timestampsExternal timestamp channels
n_periodic_outputsProgrammable periodic outputs
n_pinsProgrammable pins
Clock이 제공하는 programmable resources를 정리합니다.
PTP hardware-clock sysfs ABI: n external timestamps
50-56| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/n_external_timestamps |
| Date | 2010년 9월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/n_external_timestamps`는 PTP hardware clock이 제공하는 external timestamp channels 수입니다. |
PTP hardware-clock sysfs ABI: n periodic outputs
57-63| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/n_periodic_outputs |
| Date | 2010년 9월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/n_periodic_outputs`는 PTP hardware clock이 제공하는 programmable periodic-output channels 수입니다. |
PTP hardware-clock sysfs ABI: n pins
64-70| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/n_pins |
| Date | 2014년 3월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/n_pins`는 PTP hardware clock이 제공하는 programmable pins 수입니다. |
PTP hardware-clock sysfs ABI: n vclocks
71-83| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/n_vclocks |
| Date | 2021년 5월 |
| KernelVersion | |
| Contact | Yangbo Lu <yangbo.lu@nxp.com> |
| Description | `/sys/class/ptp/ptp<N>/n_vclocks`는 사용 중인 virtual PTP clocks 수입니다. Default `0`은 physical clock만 사용함을 뜻합니다. Nonzero value를 설정하면 그 수만큼 virtual clocks를 만들고 physical clock은 free-running 상태가 됩니다. 다시 `0`으로 설정하면 virtual clocks를 삭제하고 physical clock을 normal adjustable operation으로 되돌립니다. |
n_vclocks = 0→Physical clock adjustable→No virtual clocks
Set n_vclocks = N→Create N virtual clocks→Physical clock free running
Set back to 0→Delete virtual clocks→Restore adjustable physical clock
n_vclocks가 physical clock mode와 virtual-clock objects를 함께 전환합니다.
PTP hardware-clock sysfs ABI: pins
84-96| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/pins |
| Date | 2014년 3월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/pins` directory에는 PTP hardware clock이 제공하는 programmable pin마다 file 하나가 있습니다. Filename은 hardware-dependent pin name입니다. Read하면 assigned function과 channel number의 두 numbers를 반환하며 function은 `linux/ptp_clock.h`의 `PTP_PF_` enumeration values를 사용합니다. 두 numbers를 쓰면 function과 channel assignment를 변경할 수 있습니다. |
PositionFieldDefinition
1Assigned functionPTP_PF_ value from linux/ptp_clock.h
2Channel numberClock channel assigned to pin
Pin file read/write tuple의 두 values와 source enumeration을 보존합니다.
PTP hardware-clock sysfs ABI: pps available
97-105| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/pps_available |
| Date | 2010년 9월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/pps_available`은 PTP hardware clock이 host CPU에 Pulse Per Second를 제공하는지 나타냅니다. `1`은 PPS supported, `0`은 not supported입니다. |
ValueMeaning
1PPS supported
0PPS not supported
Host CPU에 대한 PPS capability를 binary value로 보고합니다.
PTP hardware-clock sysfs ABI: extts enable
106-115| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/extts_enable |
| Date | 2010년 9월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/extts_enable`은 external timestamps를 enable 또는 disable하는 write-only file입니다. Channel index 뒤에 `1`을 쓰면 enable, `0`을 쓰면 disable합니다. |
PositionFieldValues
1Channel indexExternal timestamp channel
2Enable1 enable; 0 disable
extts_enable의 two-integer write format입니다.
PTP hardware-clock sysfs ABI: fifo
116-123| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/fifo |
| Date | 2010년 9월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/fifo`는 external events의 timestamps를 channel index, seconds, nanoseconds의 세 integers로 제공합니다. |
PositionField
1Channel index
2Seconds
3Nanoseconds
FIFO event timestamp를 세 integers 순서로 반환합니다.
PTP hardware-clock sysfs ABI: period
124-134| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/period |
| Date | 2010년 9월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/period`는 periodic outputs를 enable 또는 disable하는 write-only file입니다. Enable하려면 channel index, start-time seconds, start-time nanoseconds, period seconds, period nanoseconds의 다섯 integers를 씁니다. Disable하려면 모든 seconds와 nanoseconds values를 zero로 설정합니다. |
PositionField
1Channel index
2Start time seconds
3Start time nanoseconds
4Period seconds
5Period nanoseconds
DisableSet every seconds and nanoseconds field to zero.
period file에 쓰는 다섯 integers 순서입니다.
PTP hardware-clock sysfs ABI: pps enable
135-142| 항목 | 한국어 전문 번역 |
|---|---|
| What | /sys/class/ptp/ptp<N>/pps_enable |
| Date | 2010년 9월 |
| KernelVersion | |
| Contact | Richard Cochran <richardcochran@gmail.com> |
| Description | `/sys/class/ptp/ptp<N>/pps_enable`은 Linux PPS subsystem으로 PPS events를 전달할지 enable 또는 disable하는 write-only file입니다. `1`은 enable, `0`은 disable입니다. |
Write 1→Enable PPS event delivery→Linux PPS subsystem receives events
Write 0→Disable PPS event delivery
pps_enable controls event delivery from the hardware clock to the Linux PPS subsystem.
Clock identity와 adjustment
sysfs-ptp:1-42Indexed PTP clock마다 friendly name, maximum frequency adjustment와 virtual-clock limit를 제공합니다.