linux-kernel - Re: [PATCH v2 6/7] dt-bindings: net: realtek: Add property to configure LED mode

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Message-ID: <CAL_JsqL_AU+JV0c2mNbXiPh2pvfYbPbLV-2PHHX0hC3vUH4QWg@mail.gmail.com>
Date:   Wed, 10 Jul 2019 09:55:12 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        netdev <netdev@...r.kernel.org>, devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH v2 6/7] dt-bindings: net: realtek: Add property to
 configure LED mode

On Wed, Jul 3, 2019 at 5:23 PM Matthias Kaehlcke <mka@...omium.org> wrote:
>
> Hi Florian,
>
> On Wed, Jul 03, 2019 at 02:37:47PM -0700, Florian Fainelli wrote:
> > On 7/3/19 12:37 PM, Matthias Kaehlcke wrote:
> > > The LED behavior of some Realtek PHYs is configurable. Add the
> > > property 'realtek,led-modes' to specify the configuration of the
> > > LEDs.
> > >
> > > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > > ---
> > > Changes in v2:
> > > - patch added to the series
> > > ---
> > >  .../devicetree/bindings/net/realtek.txt         |  9 +++++++++
> > >  include/dt-bindings/net/realtek.h               | 17 +++++++++++++++++
> > >  2 files changed, 26 insertions(+)
> > >  create mode 100644 include/dt-bindings/net/realtek.h
> > >
> > > diff --git a/Documentation/devicetree/bindings/net/realtek.txt b/Documentation/devicetree/bindings/net/realtek.txt
> > > index 71d386c78269..40b0d6f9ee21 100644
> > > --- a/Documentation/devicetree/bindings/net/realtek.txt
> > > +++ b/Documentation/devicetree/bindings/net/realtek.txt
> > > @@ -9,6 +9,12 @@ Optional properties:
> > >
> > >     SSC is only available on some Realtek PHYs (e.g. RTL8211E).
> > >
> > > +- realtek,led-modes: LED mode configuration.
> > > +
> > > +   A 0..3 element vector, with each element configuring the operating
> > > +   mode of an LED. Omitted LEDs are turned off. Allowed values are
> > > +   defined in "include/dt-bindings/net/realtek.h".
> >
> > This should probably be made more general and we should define LED modes
> > that makes sense regardless of the PHY device, introduce a set of
> > generic functions for validating and then add new function pointer for
> > setting the LED configuration to the PHY driver. This would allow to be
> > more future proof where each PHY driver could expose standard LEDs class
> > devices to user-space, and it would also allow facilities like: ethtool
> > -p to plug into that.
> >
> > Right now, each driver invents its own way of configuring LEDs, that
> > does not scale, and there is not really a good reason for that other
> > than reviewing drivers in isolation and therefore making it harder to
> > extract the commonality. Yes, I realize that since you are the latest
> > person submitting something in that area, you are being selected :)

I agree.

> I see the merit of your proposal to come up with a generic mechanism
> to configure Ethernet LEDs, however I can't justify spending much of
> my work time on this. If it is deemed useful I'm happy to send another
> version of the current patchset that addresses the reviewer's comments,
> but if the implementation of a generic LED configuration interface is
> a requirement I will have to abandon at least the LED configuration
> part of this series.

Can you at least define a common binding for this. Maybe that's just
removing 'realtek'. While the kernel side can evolve to a common
infrastructure, the DT bindings can't.

Rob