Documentation/ABI/testing/sysfs-timecard

Source file repositories/reference/linux-study-clean/Documentation/ABI/testing/sysfs-timecard

File Facts

System
Linux kernel
Corpus path
Documentation/ABI/testing/sysfs-timecard
Extension
[no extension]
Size
11874 bytes
Lines
294
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: Documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

What:		/sys/class/timecard/
Date:		September 2021
Contact:	Jonathan Lemon <jonathan.lemon@gmail.com>
Description:	This directory contains files and directories
		providing a standardized interface to the ancillary
		features of the OpenCompute timecard.

What:		/sys/class/timecard/ocpN/
Date:		September 2021
Contact:	Jonathan Lemon <jonathan.lemon@gmail.com>
Description:	This directory contains the attributes of the Nth timecard
		registered.

What:		/sys/class/timecard/ocpN/available_clock_sources
Date:		September 2021
Contact:	Jonathan Lemon <jonathan.lemon@gmail.com>
Description:	(RO) The list of available time sources that the PHC
		uses for clock adjustments.

		====  =================================================
                NONE  no adjustments
                PPS   adjustments come from the PPS1 selector (default)
                TOD   adjustments from the GNSS/TOD module
                IRIG  adjustments from external IRIG-B signal
                DCF   adjustments from external DCF signal
                ====  =================================================

What:		/sys/class/timecard/ocpN/available_sma_inputs
Date:		September 2021
Contact:	Jonathan Lemon <jonathan.lemon@gmail.com>
Description:	(RO) Set of available destinations (sinks) for a SMA
		input signal.

                =====  ================================================
                10Mhz  signal is used as the 10Mhz reference clock
                PPS1   signal is sent to the PPS1 selector
                PPS2   signal is sent to the PPS2 selector
                TS1    signal is sent to timestamper 1
                TS2    signal is sent to timestamper 2
                TS3    signal is sent to timestamper 3
                TS4    signal is sent to timestamper 4
                IRIG   signal is sent to the IRIG-B module
                DCF    signal is sent to the DCF module
                FREQ1  signal is sent to frequency counter 1
                FREQ2  signal is sent to frequency counter 2
                FREQ3  signal is sent to frequency counter 3
                FREQ4  signal is sent to frequency counter 4
                None   signal input is disabled
                =====  ================================================

What:		/sys/class/timecard/ocpN/available_sma_outputs
Date:		May 2021
Contact:	Jonathan Lemon <jonathan.lemon@gmail.com>
Description:	(RO) Set of available sources for a SMA output signal.

                =====  ================================================
                10Mhz  output is from the 10Mhz reference clock
                PHC    output PPS is from the PHC clock
                MAC    output PPS is from the Miniature Atomic Clock
                GNSS1  output PPS is from the first GNSS module
                GNSS2  output PPS is from the second GNSS module
                IRIG   output is from the PHC, in IRIG-B format
                DCF    output is from the PHC, in DCF format
                GEN1   output is from frequency generator 1
                GEN2   output is from frequency generator 2
                GEN3   output is from frequency generator 3
                GEN4   output is from frequency generator 4
                GND    output is GND
                VCC    output is VCC
                =====  ================================================

Annotation

Implementation Notes