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From: Vladimir Oltean <olteanv@gmail.com>
To: Yangbo Lu <yangbo.lu@nxp.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
	netdev <netdev@vger.kernel.org>,
	"David S . Miller" <davem@davemloft.net>,
	Richard Cochran <richardcochran@gmail.com>,
	Vladimir Oltean <vladimir.oltean@nxp.com>,
	Claudiu Manoil <claudiu.manoil@nxp.com>,
	Andrew Lunn <andrew@lunn.ch>,
	Vivien Didelot <vivien.didelot@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>
Subject: Re: [PATCH 6/6] ptp_ocelot: support 4 programmable pins
Date: Fri, 20 Mar 2020 15:20:32 +0200	[thread overview]
Message-ID: <CA+h21hoBwDuWCFbO70u1FAERB8zc5F+H5URBkn=2_bpRRRz1oA@mail.gmail.com> (raw)
In-Reply-To: <20200320103726.32559-7-yangbo.lu@nxp.com>

Hi Yangbo,

On Fri, 20 Mar 2020 at 12:42, Yangbo Lu <yangbo.lu@nxp.com> wrote:
>
> Support 4 programmable pins for only one function periodic
> signal for now. Since the hardware is not able to support
> absolute start time, driver starts periodic signal immediately.
>

Are you absolutely sure it doesn't support absolute start time?
Because that would mean it's pretty useless if the phase of the PTP
clock signal is out of control.

I tested your patch on the LS1028A-RDB board using the following commands:

# Select PEROUT function and assign a channel to each of pins
SWITCH_1588_DAT0 and SWITCH_1588_DAT1
echo '2 0' > /sys/class/ptp/ptp1/pins/switch_1588_dat0
echo '2 1' > /sys/class/ptp/ptp1/pins/switch_1588_dat1
# Generate pulses with 1 second period on channel 0
echo '0 0 0 1 0' > /sys/class/ptp/ptp1/period
# Generate pulses with 1 second period on channel 1
echo '1 0 0 1 0' > /sys/class/ptp/ptp1/period

And here is what I get:
https://drive.google.com/open?id=1ErWufJL0TWv6hKDQdF1pRL5gn4hn4X-r

So the periodic output really starts 'now' just like the print says,
so the output from DAT0 is not even in sync with DAT1.

> Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
> ---

Thanks,
-Vladimir

  reply	other threads:[~2020-03-20 13:20 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-20 10:37 [PATCH 0/6] Support programmable pins for Ocelot PTP driver Yangbo Lu
2020-03-20 10:37 ` [PATCH 1/6] ptp: move ocelot ptp clock code out of Ethernet driver Yangbo Lu
2020-03-20 16:37   ` Vladimir Oltean
2020-03-24  4:46     ` Y.b. Lu
2020-03-20 21:31   ` kbuild test robot
2020-03-20 23:03   ` kbuild test robot
2020-03-20 10:37 ` [PATCH 2/6] MAINTAINERS: add entry for Microsemi Ocelot PTP driver Yangbo Lu
2020-03-20 17:28   ` Alexandre Belloni
2020-03-24  4:50     ` Y.b. Lu
2020-03-20 10:37 ` [PATCH 3/6] net: mscc: ocelot: fix timestamp info if ptp clock does not work Yangbo Lu
2020-03-20 10:37 ` [PATCH 4/6] net: mscc: ocelot: redefine PTP pins Yangbo Lu
2020-03-20 10:37 ` [PATCH 5/6] net: mscc: ocelot: add wave programming registers definitions Yangbo Lu
2020-03-20 10:37 ` [PATCH 6/6] ptp_ocelot: support 4 programmable pins Yangbo Lu
2020-03-20 13:20   ` Vladimir Oltean [this message]
2020-03-24  5:21     ` Y.b. Lu
2020-03-24 13:19       ` Richard Cochran
2020-03-25  3:20         ` Y.b. Lu
2020-03-24  9:24     ` Horatiu Vultur
2020-03-24 13:07   ` Richard Cochran
2020-03-25  3:08     ` Y.b. Lu
2020-03-25 13:41       ` Richard Cochran
2020-03-26  9:34         ` Y.b. Lu
2020-03-26 13:59           ` Richard Cochran
2020-03-27  5:47             ` Y.b. Lu
2020-03-31  4:18               ` Y.b. Lu
2020-03-25 13:15   ` Richard Cochran
2020-03-26  9:25     ` Y.b. Lu

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