netdev - Re: [PATCH net-next] net: phy: realtek: fix RTL8211F wake-on-lan support

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Message-ID: <aJx-5qV7qHxk2Uxe@shell.armlinux.org.uk>
Date: Wed, 13 Aug 2025 13:02:46 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	Daniel Braunwarth <daniel.braunwarth@...a.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Jon Hunter <jonathanh@...dia.com>,
	netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
	Thierry Reding <treding@...dia.com>
Subject: Re: [PATCH net-next] net: phy: realtek: fix RTL8211F wake-on-lan
 support

On Wed, Aug 13, 2025 at 11:04:45AM +0100, Russell King (Oracle) wrote:
> +	/* Mark this PHY as wakeup capable and register the interrupt as a
> +	 * wakeup IRQ if the PHY is marked as a wakeup source in firmware,
> +	 * and the interrupt is valid.
> +	 */
> +	if (device_property_read_bool(dev, "wakeup-source") &&
> +	    phy_interrupt_is_valid(phydev)) {
> +		device_set_wakeup_capable(dev, true);
> +		devm_pm_set_wake_irq(dev, phydev->irq);
> +	}

I'm wondering whether this should just check for the "wakeup-source"
property, which would allow for PMEB mode, and if we don't have a valid
interrupt, we set the INTB/PMEB pin to PMEB mode here. In other words:

	if (device_property_read_bool(dev, "wakeup-source")) {
		device_set_wakeup_capable(dev, true);
		if (phy_interrupt_is_valid(phydev)) {
			devm_pm_set_wake_irq(dev, phydev->irq);
		} else {
			ret = phy_modify_paged(phydev, RTL8211F_INTBCR_PAGE,
					       RTL8211F_INTBCR,
					       RTL8211F_INTBCR_INTB_PMEB,
					       RTL8211F_INTBCR_INTB_PMEB);
		}
	}

this would support example 3 in the wakeup-source document, where the
PHY is connected to an interrupt-less power management controller.

Any thoughts?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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