netdev - Re: [PATCH net-next 5/5] igc: Export LEDs

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Date:   Mon, 19 Jul 2021 00:10:52 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Kurt Kanzenbach <kurt@...utronix.de>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        sasha.neftin@...el.com, vitaly.lifshits@...el.com,
        vinicius.gomes@...el.com,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Dvora Fuxbrumer <dvorax.fuxbrumer@...ux.intel.com>
Subject: Re: [PATCH net-next 5/5] igc: Export LEDs

On 16.07.2021 23:56, Andrew Lunn wrote:
> On Fri, Jul 16, 2021 at 02:24:27PM -0700, Tony Nguyen wrote:
>> From: Kurt Kanzenbach <kurt@...utronix.de>
>>
>> Each i225 has three LEDs. Export them via the LED class framework.
>>
>> Each LED is controllable via sysfs. Example:
>>
>> $ cd /sys/class/leds/igc_led0
>> $ cat brightness      # Current Mode
>> $ cat max_brightness  # 15
>> $ echo 0 > brightness # Mode 0
>> $ echo 1 > brightness # Mode 1
>>
>> The brightness field here reflects the different LED modes ranging
>> from 0 to 15.
> 
> What do you mean by mode? Do you mean blink mode? Like On means 1G
> link, and it blinks for packet TX?
> 
Supposedly mode refers to a 4-bit bitfield in a LED control register
where each value 0 .. 15 stands for a different blink mode.
So you would need the datasheet to know which value to set.

>     Andrew
> 
Heiner