linux-kernel - Re: [PATCH net-next 10/11] net: dsa: mv88e6xxx: remove EEE support

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Message-ID: <20170801142843.GE23157@lunn.ch>
Date:   Tue, 1 Aug 2017 16:28:43 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net-next 10/11] net: dsa: mv88e6xxx: remove EEE support

On Mon, Jul 31, 2017 at 06:17:18PM -0400, Vivien Didelot wrote:
> The PHY's EEE settings are already accessed by the DSA layer through the
> Marvell PHY driver and there is nothing to be done for switch's MACs.

I'm confused, or missing something. Does not patch #1 mean that if the
DSA driver does not have a set_eee function, we always return -ENODEV
in slave.c?

There might be nothing to configure here, but some of the switches do
support EEE. So we need at least a NOP set_eee. Better still it should
return -ENODEV for those switches which don't actually support EEE,
and 0 for those that do?

    Andrew