netdev - Re: [PATCH 0/2] net: phy: dp83867: Configure LED modes via device tree

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Date:   Fri, 19 Mar 2021 22:19:44 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Tretter <m.tretter@...gutronix.de>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        kernel@...gutronix.de, robh+dt@...nel.org, hkallweit1@...il.com,
        dmurphy@...com
Subject: Re: [PATCH 0/2] net: phy: dp83867: Configure LED modes via device
 tree

On Fri, Mar 19, 2021 at 04:57:08PM +0100, Michael Tretter wrote:
> Hello,
> 
> The dp83867 has 4 LED pins, which can be multiplexed with different functions
> of the phy.
> 
> This series adds a device tree binding to describe the multiplexing of the
> functions to the LEDs and implements the binding for the dp83867 phy.
> 
> I found existing bindings for configuring the LED modes for other phys:
> 
> In Documentation/devicetree/bindings/net/micrel.txt, the binding is not
> flexible enough for the use case in the dp83867, because there is a value for
> each LED configuration, which would be a lot of values for the dp83867.
> 
> In Documentation/devicetree/bindings/net/mscc-phy-vsc8532.txt, there is a
> separate property for each LED, which would work, but I found rather
> unintuitive compared to how clock bindings etc. work.
> 
> The new binding defines two properties: one for the led names and another
> property for the modes of the LEDs with defined values in the same order.
> Currently, the binding is specific to the dp83867, but I guess that the
> binding could be made more generic and used for other phys, too.

There is some work going on to manage PHY LEDs just like other LEDs in
Linux, using /sys/class/leds.

Please try to help out with that work, rather than adding yet another
DT binding.

   Andrew