linux-kernel - [RFC] net: phy: add shutdown hook to struct phy

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Message-ID: <20200930174419.345cc9b4@xhacker.debian>
Date:   Wed, 30 Sep 2020 17:47:43 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC] net: phy: add shutdown hook to struct phy_driver

Hi,

A GE phy supports pad isolation which can save power in WOL mode. But once the
isolation is enabled, the MAC can't send/receive pkts to/from the phy because
the phy is "isolated". To make the PHY work normally, I need to move the
enabling isolation to suspend hook, so far so good. But the isolation isn't
enabled in system shutdown case, to support this, I want to add shutdown hook
to net phy_driver, then also enable the isolation in the shutdown hook. Is
there any elegant solution?

Or we can break the assumption: ethernet can still send/receive pkts after
enabling WoL, no?

Thanks in advance,
Jisheng