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Date:   Sun, 17 Mar 2019 19:38:43 +0100
From:   Andrew Lunn <>
To:     Florian Fainelli <>
Cc:     Jose Abreu <>,,,
        "David S. Miller" <>,
        Joao Pinto <>
Subject: Re: [PATCH net] net: phy: Don't assume loopback is supported

On Fri, Mar 15, 2019 at 03:48:41PM -0700, Florian Fainelli wrote:
> On 3/14/19 3:37 AM, Jose Abreu wrote:
> > Some PHYs may not support loopback mode so we need to check if register
> > is read-only.
> > 
> In that case it may be appropriate to have a specific PHY driver that
> implements a set_loopback() method returning -EOPNOTSUPP instead of
> changing the generic PHY implementation.

Hi Jose

Since Heiner says this is a mandatory feature, we should not really
penalise conformant PHYs just because there is one broken PHY.

Please handle this in the PHY driver, by implementing the set_loopback


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