netdev - Re: [PATCH net-next v5 9/9] net: dsa: microchip: ksz9477: add periodic output support

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Date:   Thu, 3 Dec 2020 16:36:26 +0100
From:   Christian Eggers <ceggers@...i.de>
To:     Richard Cochran <richardcochran@...il.com>
CC:     Vladimir Oltean <olteanv@...il.com>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Rob Herring <robh+dt@...nel.org>,
        "Vivien Didelot" <vivien.didelot@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Kurt Kanzenbach <kurt.kanzenbach@...utronix.de>,
        George McCollister <george.mccollister@...il.com>,
        Marek Vasut <marex@...x.de>,
        Helmut Grohne <helmut.grohne@...enta.de>,
        Paul Barker <pbarker@...sulko.com>,
        "Codrin Ciubotariu" <codrin.ciubotariu@...rochip.com>,
        Tristram Ha <Tristram.Ha@...rochip.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v5 9/9] net: dsa: microchip: ksz9477: add periodic output support

On Thursday, 3 December 2020, 15:12:55 CET, Richard Cochran wrote:
> On Thu, Dec 03, 2020 at 11:21:17AM +0100, Christian Eggers wrote:
> > The KSZ9563 has a Trigger Output Unit (TOU) which can be used to
> > generate periodic signals.
> > 
> > The pulse length can be altered via a device attribute.
> 
> Device tree is the wrong place for that.
I meant a device specfic sysfs attribute.
/sys/class/ptp/ptp2/device/pulse

But this is not true anymore, as I moved the sysfs attribute to a later 
patch (not submitted yet).

> Aren't you using PTP_PEROUT_DUTY_CYCLE anyhow?
I also use PTP_PEROUT_DUTY_CYCLE. But this cannot be set via a shell
script. The existing "period" sysfs attribute doesn't allow to set
the pulse length, so I added a device specific attribute for this.

Should ptp_sysfs be extended with a "pulse" attribute with calls
enable() with only PTP_PEROUT_DUTY_CYCLE set?

> 
> Thanks,
> Richard
> 
> 
regards
Christian