How to get 1pps IEEE 1588 in LS2088 IEEE header pins

[deepanrajanbara]

Hi,

I am working on ls2088ardb board to get IEEE 1588 1PPS. The kernel version that I used is 4.19.68. It seems the kernel supports 1588 feature. However I couldn't find any document or instructions to enable 1PPS signal. I wanted the 1PPS signal in the IEEE header which is avialable in the EVK board. Kernel wise we have enabled the configuration in driver, But DTS file where we need to configure and any specific GPIO we need to give in the DTS file pleas let us know.

Thank you,
Deepanraj.A

[ufedor]

Please refer to the Layerscape Software Development Kit User Guide, Rev. 20.12, 8.7.7.1 PPS signal.

[deepanrajanbara]

Hi,

We have done the configuration as per the user guide . But After this changes will the 1PPS be available in the IEEE header pins of the LS2088ardb board. If so which pin it will be reflected.

Thank you,

Deepanraj.A

[ufedor]

> which pin it will be reflected

JP4[3] - TSEC_1588_PULSE_OUT1

JP4[1] - TSEC_1588_PULSE_OUT2

[deepanrajanbara]

what pulse out pin will generate? 

Thank you,

Deepanraj

[ufedor]

Parameters of the PPS signal are described in the QorIQ LS2088A/LS2048A Data Sheet, Table 35. IEEE 1588 AC timing specifications, TSEC_1588_PULSE_OUT1/2

[deepanrajanbara]

JP4[8] pin is clock right ?

[ufedor]

JP4[8] pin is TSEC_1588_CLK_OUT.

[deepanrajanbara]

Hi ,

One doubt like any GPIO we need to configure to get the 1PPS in the those pins. Due to hardware restriction we are not able to probe and check. 

Thank you,

Deepanraj.A