linux-kernel - Re: [PATCH] phy: micrel.c: Support ksz9031 energy-detect power-down mode

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Message-ID: <57F28799.7030701@topic.nl>
Date:   Mon, 3 Oct 2016 18:30:17 +0200
From:   Mike Looijmans <mike.looijmans@...ic.nl>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, f.fainelli@...il.com
Subject: Re: [PATCH] phy: micrel.c: Support ksz9031 energy-detect power-down
 mode

On 03-10-16 16:35, Andrew Lunn wrote:
>> +    Boolean:
>> +
>> +      - enable-edpd : Not related to timing. Specify this property to enable
>> +                      energy-detect power-down mode in the PHY.
>
> The Broadcom PHYs unconditionally enable this feature.
>
> The SMSC driver has an option: smsc,disable-energy-detect because it
> seems to have a rare hardware bug when it is enabled.
>
> And you would like to make it off by default.
>
> Could we avoid having three drivers doing three different things?
> Could you have it unconditionally on, and see if anybody reports it
> being broken?

Good suggestion I think. It's a feature found on many PHYs, apparently 
without any ill effects, so just enabling unconditionally simplifies 
things. And it's good for the environment...

I'll post a v2 patch (which won't need devicetree changes then).

-- 
Mike Looijmans