linux-kernel - Re: [RFC net-next 0/5] net: phy: add support for shared interrupts

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Message-ID: <20201025101846.tbrap3iw53lmixyx@skbuf>
Date:   Sun, 25 Oct 2020 10:18:47 +0000
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     Michael Walle <michael@...le.cc>
CC:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Jakub Kicinski <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Andre Edich <andre.edich@...rochip.com>,
        Antoine Tenart <atenart@...nel.org>,
        Baruch Siach <baruch@...s.co.il>,
        Christophe Leroy <christophe.leroy@....fr>,
        Dan Murphy <dmurphy@...com>,
        Divya Koppera <Divya.Koppera@...rochip.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Jerome Brunet <jbrunet@...libre.com>,
        Kavya Sree Kotagiri <kavyasree.kotagiri@...rochip.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Marco Felsch <m.felsch@...gutronix.de>,
        Marek Vasut <marex@...x.de>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Mathias Kresin <dev@...sin.me>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Neil Armstrong <narmstrong@...libre.com>,
        Nisar Sayed <Nisar.Sayed@...rochip.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Philippe Schenker <philippe.schenker@...adex.com>,
        Willy Liu <willy.liu@...ltek.com>,
        Yuiko Oshino <yuiko.oshino@...rochip.com>
Subject: Re: [RFC net-next 0/5] net: phy: add support for shared interrupts

On Sun, Oct 25, 2020 at 09:17:58AM +0100, Michael Walle wrote:
> Am 2020-10-24 14:14, schrieb Ioana Ciornei:
> > - Every PHY driver gains a .handle_interrupt() implementation that, for
> >   the most part, would look like below:
> > 
> > 	irq_status = phy_read(phydev, INTR_STATUS);
> > 	if (irq_status < 0) {
> > 		phy_error(phydev);
> > 		return IRQ_NONE;
> > 	}
> > 
> > 	if (irq_status == 0)
> > 		return IRQ_NONE;
> > 
> > 	phy_trigger_machine(phydev);
> > 
> > 	return IRQ_HANDLED;
> 
> Would it make sense to provide this (default) version inside the core?
> Simple PHY drivers then just could set the callback to this function.
> (There must be some property for the INTR_STATUS, which is likely to
> be different between different PHYs, though).

Yes, the interrupt status register's address differs even between PHYs
from the same vendor so making this somehow into a default handler would
mean to add even another callback that actually reads the register.

For simple PHY drivers, the .handle_interrupt() implementation would
mean 15-20 lines of code for a much more straightforward implementation.
I think that's fair.

Ioana