adding sync method in phosphor-time-manager

Velumani T-ERS,HCLTech velumanit at
Thu Oct 8 04:18:06 AEDT 2020

Classification: HCL Internal

Time owner module was a different module which decides who owns the time BMC/host and set the time using NTP mode or Manual Mode.
in Time owner module ,user set the host time using the below command manually by providing  the time.
busctl set-property xyz.openbmc_project.Time.Manager \
       /xyz/openbmc_project/time/host xyz.openbmc_project.Time.EpochTime \
                   Elapsed t <value-in-microseconds>

we are now actually not repeating the time owner implementation instead we are adding one more mode(HostSync) to time manager setting.

    How HostSync intent to work:
       sync mode will get time from the host.
                   1.1 Add an empty system service file in this repo and spawn this service when HostSync enabled
                   1.2 This service file can be override by the platform machine layer.
                   1.3 The platform machine layer install the service file and the shell script to get the time from host.
        will set the time to BMC using the shell script.
-----Original Message-----
From: Patrick Williams <patrick at>
Sent: Wednesday, October 7, 2020 7:08 AM
To: Richard Hanley <rhanley at>
Cc: Velumani T-ERS,HCLTech <velumanit at>; openbmc at; Patrick Williams <patrickw3 at>
Subject: Re: adding sync method in phosphor-time-manager

On Tue, Oct 06, 2020 at 02:41:29PM -0700, Richard Hanley wrote:
> While we're on the subject, has anyone ever taken a look at using
> roughtime on a BMC? I imagine it could a really valuable extension to
> phosphor-time-manager some time in the future.

One of the problems I see is that there are a few different proposals for "next generation time" protocols beyond NTP.  Unless a project member has an explicit requirement for one of them, it doesn't seem like we should go out of our way to pick one of them.  If someone is especially interested in implementing one of them in their spare time though, they're more than welcome.

Patrick Williams
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