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Date:   Wed, 9 Aug 2023 15:29:17 +0100
From:   "Russell King (Oracle)" <linux@armlinux.org.uk>
To:     Ioana Ciornei <ioana.ciornei@nxp.com>
Cc:     Florian Fainelli <f.fainelli@gmail.com>,
        Jakub Kicinski <kuba@kernel.org>, Andrew Lunn <andrew@lunn.ch>,
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        Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= 
        <u.kleine-koenig@pengutronix.de>,
        Ioana Ciornei <ciorneiioana@gmail.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Alexandru Ardelean <alexandru.ardelean@analog.com>,
        Andre Edich <andre.edich@microchip.com>,
        Antoine Tenart <atenart@kernel.org>,
        Baruch Siach <baruch@tkos.co.il>,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        Divya Koppera <Divya.Koppera@microchip.com>,
        Hauke Mehrtens <hauke@hauke-m.de>,
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        Willy Liu <willy.liu@realtek.com>,
        Yuiko Oshino <yuiko.oshino@microchip.com>
Subject: Re: [PATCH] net: phy: Don't disable irqs on shutdown if WoL is
 enabled
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On Wed, Aug 09, 2023 at 05:21:55PM +0300, Ioana Ciornei wrote:
> That's a perfect summary of the problem that I was trying to fix.
> 
> The board in question is a LS1021ATSN which has two AR8031 PHYs that
> share an interrupt line. In case only one of the PHYs is probed and
> there are pending interrupts on the PHY#2 an IRQ storm will happen
> since there is no entity to clear the interrupt from PHY#2's registers.
> PHY#1's driver will get stuck in .handle_interrupt() indefinitely.

So I have two further questions:
1. Is WoL able to be supported on this hardware?
2. AR8031 has a seperate WOL_INT signal that can be used to wake up the
   system. Is this used in the hardware design?

Thanks.

-- 
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