linux-kernel - Re: [PATCH 4/6] net: ethernet: ti: cpts: add ptp pps support

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Message-ID: <e67cfba3-7e57-cc1d-6654-00c0a5378382@ti.com>
Date:   Tue, 6 Dec 2016 14:43:49 -0600
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Richard Cochran <richardcochran@...il.com>
CC:     "David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
        Mugunthan V N <mugunthanvnm@...com>,
        Sekhar Nori <nsekhar@...com>, <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
        <devicetree@...r.kernel.org>,
        Murali Karicheri <m-karicheri2@...com>,
        Wingman Kwok <w-kwok2@...com>
Subject: Re: [PATCH 4/6] net: ethernet: ti: cpts: add ptp pps support



On 12/06/2016 12:08 PM, Richard Cochran wrote:
> On Wed, Nov 30, 2016 at 11:05:19AM +0100, Richard Cochran wrote:
>> Can you adjust the frequency of the keystone devices in hardware?  If
>> so, then please implement it, and just disable PPS for the CPSW.
>>
>> The only reason I used the timecounter for frequency adjustment was
>> because the am335x HW is broken.  But this shouldn't hold back other
>> newer HW without the same silicon flaws.
>
> I am talking here about the ADPLLLJ units.  Are they usable on the
> keystone?
>
> If so, please implement the frequency adjustment with them.
>

No, I think it's not impossible (at least as I know now).
i'll drop this patch for now.

By the way, I've tested am335 (BBB)+ HW_TS_PUSH + PWM.
Seems works.

-- 
regards,
-grygorii