linux-kernel - Re: [PATCH net-next + leds v2 6/7] net: phy: marvell: add support for LEDs controlled by Marvell PHYs

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Date:   Thu, 10 Sep 2020 20:31:54 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Pavel Machek <pavel@....cz>
Cc:     Marek Behún <marek.behun@....cz>,
        netdev@...r.kernel.org, linux-leds@...r.kernel.org,
        Dan Murphy <dmurphy@...com>,
        Ondřej Jirman <megous@...ous.com>,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next + leds v2 6/7] net: phy: marvell: add support
 for LEDs controlled by Marvell PHYs

On Thu, Sep 10, 2020 at 08:24:34PM +0200, Pavel Machek wrote:
> On Thu 2020-09-10 15:15:41, Andrew Lunn wrote:
> > On Thu, Sep 10, 2020 at 02:23:41PM +0200, Pavel Machek wrote:
> > > On Wed 2020-09-09 18:25:51, Marek Behún wrote:
> > > > This patch adds support for controlling the LEDs connected to several
> > > > families of Marvell PHYs via the PHY HW LED trigger API. These families
> > > > are: 88E1112, 88E1121R, 88E1240, 88E1340S, 88E1510 and 88E1545. More can
> > > > be added.
> > > > 
> > > > This patch does not yet add support for compound LED modes. This could
> > > > be achieved via the LED multicolor framework.
> > > > 
> > > > Settings such as HW blink rate or pulse stretch duration are not yet
> > > > supported.
> > > > 
> > > > Signed-off-by: Marek Behún <marek.behun@....cz>
> > > 
> > > I suggest limiting to "useful" hardware modes, and documenting what
> > > those modes do somewhere.
> > 
> > I think to keep the YAML DT verification happy, they will need to be
> > listed in the marvell PHY binding documentation.
> 
> Well, this should really go to the sysfs documenation. Not sure what
> to do with DT.

In DT you can set how you want the LED to blink by default. I expect
that will be the most frequent use cases, and nearly nobody will
change it at runtime.

> But perhaps driver can set reasonable defaults without DT input?

Generally the driver will default to the hardware reset blink
pattern. There are a few PHY drivers which change this at probe, but
not many. The silicon defaults are pretty good.

    Andrew