netdev - Re: [RFC PATCH v3 6/8] leds: trigger: add hardware-phy-activity trigger

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Date:   Wed, 10 Nov 2021 21:04:34 +0100
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Marek Behún <kabel@...nel.org>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Corbet <corbet@....net>, Pavel Machek <pavel@....cz>,
        John Crispin <john@...ozen.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [RFC PATCH v3 6/8] leds: trigger: add hardware-phy-activity
 trigger

On Tue, Nov 09, 2021 at 10:09:40PM +0100, Andrew Lunn wrote:
> > > +/* Expose sysfs for every blink to be configurable from userspace */
> > > +DEFINE_OFFLOAD_TRIGGER(blink_tx, BLINK_TX);
> > > +DEFINE_OFFLOAD_TRIGGER(blink_rx, BLINK_RX);
> > > +DEFINE_OFFLOAD_TRIGGER(keep_link_10m, KEEP_LINK_10M);
> > > +DEFINE_OFFLOAD_TRIGGER(keep_link_100m, KEEP_LINK_100M);
> > > +DEFINE_OFFLOAD_TRIGGER(keep_link_1000m, KEEP_LINK_1000M);
> 
> You might get warnings about CamelCase, but i suggest keep_link_10M,
> keep_link_100M and keep_link_1000M. These are megabits, not millibits.
> 
> > > +DEFINE_OFFLOAD_TRIGGER(keep_half_duplex, KEEP_HALF_DUPLEX);
> > > +DEFINE_OFFLOAD_TRIGGER(keep_full_duplex, KEEP_FULL_DUPLEX);
> 
> What does keep mean in this context?
>

LED is turned on but doesn't blink. Hint for a better name?

> > > +DEFINE_OFFLOAD_TRIGGER(option_linkup_over, OPTION_LINKUP_OVER);
> > > +DEFINE_OFFLOAD_TRIGGER(option_power_on_reset, OPTION_POWER_ON_RESET);
> > > +DEFINE_OFFLOAD_TRIGGER(option_blink_2hz, OPTION_BLINK_2HZ);
> > > +DEFINE_OFFLOAD_TRIGGER(option_blink_4hz, OPTION_BLINK_4HZ);
> > > +DEFINE_OFFLOAD_TRIGGER(option_blink_8hz, OPTION_BLINK_8HZ);
> > 
> > This is very strange. Is option_blink_2hz a trigger on itself? Or just
> > an option for another trigger? It seems that it is an option, so that I
> > can set something like
> >   blink_tx,option_blink_2hz
> > and the LED will blink on tx activity with frequency 2 Hz... If that is
> > so, I think you are misnaming your macros or something, since you are
> > defining option_blink_2hz as a trigger with
> >  DEFINE_OFFLOAD_TRIGGER
> 
> Yes, i already said this needs handling differently. The 2Hz, 4Hz and
> 8Hz naturally fit the delay_on, delay_of sysfs attributes.
> 
>     Andrew

You are totally right. I tought the blink control was something specific
that only some PHY had, but considering we have more than 1 that
supports a variant of it, I can see how it should be handled separately.
I assume even more have this kind of customizzation.

-- 
	Ansuel