netdev - Re: [PATCH 0/3] Control ethernet PHY LEDs via LED subsystem

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Date:	Wed, 23 Mar 2016 21:24:00 +0100
From:	Vishal Thanki <vishalthanki@...il.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	Matus Ujhelyi <ujhelyi.m@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH 0/3] Control ethernet PHY LEDs via LED subsystem

Hi,

> My suggestion was that the hardware needs to control the LEDs. You
> have software doing it. You might be able to do this with the PHY
> state machine for link. But activity is never going to be accepted if
> software control.
>
> The LED trigger attached to an LED should be used to configure the
> hardware to drive the LED as wanted.
>

The eth-phy-activity trigger uses the blink_set which I think uses the
hardware acceleration if available. I am not sure how to handles LEDs
which does not have hardware acceleration for this (eth-phy-activity)
trigger.

> The exception to this is when there is no trigger attached, and the
> brightness can set the on/off state, if the hardware supports this.
>
>            Andrew