linux-kernel - Re: [PATCH RFC leds + net-next v2 0/1] Add support for LEDs on Marvell PHYs

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Message-ID: <20200724151813.709f2a4e@dellmb.labs.office.nic.cz>
Date:   Fri, 24 Jul 2020 15:18:13 +0200
From:   Marek Behún <marek.behun@....cz>
To:     Pavel Machek <pavel@....cz>
Cc:     linux-leds@...r.kernel.org, jacek.anaszewski@...il.com,
        Dan Murphy <dmurphy@...com>,
        Ondřej Jirman <megous@...ous.com>,
        netdev@...r.kernel.org, Russell King <linux@...linux.org.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC leds + net-next v2 0/1] Add support for LEDs on
 Marvell PHYs

On Fri, 24 Jul 2020 15:12:33 +0200
Marek Behún <marek.behun@....cz> wrote:

> On Fri, 24 Jul 2020 12:29:01 +0200
> Pavel Machek <pavel@....cz> wrote:
> 
> > In future, would you expect having software "1000/100/10/nolink"
> > triggers I could activate on my scrollock LED (or on GPIO controlled
> > LEDs) to indicate network activity?  
> 
> Look at drivers/net/phy/phy_led_triggers.c, something like that could
> be actually implemented there.
> 
> Some of the modes are useful, like the "1000/100/10/nolink". But some
> of them are pretty weird, and I don't think anyone actually uses it
> ("1000-10/else", which is on if the device is linked at 1000mbps ar
> 10mbps, and else off? who would sacrifies a LED for this?).
> 
> I actually wanted to talk about the phy_led_triggers.c code. It
> registers several trigger for each PHY, with the name in form:
>   phy-device-name:mode
> where
>   phy-device-name is derived from OF
>     - sometimes it is in the form
>       d0032004.mdio-mii:01
>     - but sometimes in the form of whole OF path followed by ":" and
>       the PHY address:
>       /soc/internal-regs@...00000/mdio@...04/switch0@...mdio:08
>   mode is "link", "1Gbps", "100Mbps", "10Mbps" and so on"
> 
> So I have a GPIO LED, and I can set it to sw trigger so that it is on
> when a specific PHY is linked on 1Gbps.
> 
> The problem is that on Turris Mox I can connect up to three 8-port
> switches, which yields in 25 network PHYs overall. So reading the
> trigger file results in 4290 bytes (look at attachment
> cat_trigger.txt). I think the phy_led_triggers should have gone this
> way of having just one trigger (like netdev has), and specifying phy
> device via and mode via another file.
> 
> Marek
> 

In fact I think the way the phy_led_triggers does this should be
deprecated. I new kernel config options should be create, something
like "new user API for PHY LED trigger", which would create just one
trigger, with name phydev, like we have netdev, and like in the netdev
trigger, the mode and device should be configured via other files.

This phydev trigger could then be made similar to phy-hw-mode trigger...

Marek