linux-kernel - Re: [PATCH net-next] net: phy: micrel: Add support for lan9645x internal phy

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Message-ID: <d5177d67-7b61-4459-befe-999dc052ca2b@bootlin.com>
Date: Fri, 23 Jan 2026 09:57:32 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Jens Emil Schulz Østergaard
 <jensemil.schulzostergaard@...rochip.com>, Andrew Lunn <andrew@...n.ch>,
 Heiner Kallweit <hkallweit1@...il.com>, Russell King
 <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 Horatiu Vultur <horatiu.vultur@...rochip.com>, o.rempel@...gutronix.de,
 Steen Hegelund <Steen.Hegelund@...rochip.com>,
 Daniel Machon <daniel.machon@...rochip.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: phy: micrel: Add support for lan9645x
 internal phy

Hi Jens,

On 23/01/2026 08:50, Jens Emil Schulz Østergaard wrote:
> LAN9645X is a family of switch chips with 5 internal copper phys. The
> internal PHY is based on parts of LAN8832. This is a low-power, single
> port triple-speed (10BASE-T/100BASE-TX/1000BASE-T) ethernet physical
> layer transceiver (PHY) that supports transmission and reception of data
> on standard CAT-5, as well as CAT-5e and CAT-6 Unshielded Twisted
> Pair (UTP) cables.
> 
> Add support for the internal PHY of the lan9645x chip family.
> 
> Reviewed-by: Steen Hegelund <Steen.Hegelund@...rochip.com>
> Reviewed-by: Daniel Machon <daniel.machon@...rochip.com>
> Signed-off-by: Jens Emil Schulz Østergaard <jensemil.schulzostergaard@...rochip.com>
> ---

[...]

> +static int lan9645x_config_intr(struct phy_device *phydev)
> +{
> +	int err;
> +
> +	/* enable / disable interrupts */
> +	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
> +		/* This is an internal PHY of lan9645x and is not possible to
> +		 * change the polarity of irq sources in the OIC (CPU_INTR)
> +		 * found in lan9645x. Therefore change the polarity of the
> +		 * interrupt in the PHY from being active low instead of active
> +		 * high.
> +		 */
> +		phy_write(phydev, LAN8804_CONTROL,
> +			  LAN8804_CONTROL_INTR_POLARITY);
> +
> +		/* By default interrupt buffer is open-drain in which case the
> +		 * interrupt can be active only low. Therefore change the
> +		 * interrupt buffer to be push-pull to be able to change
> +		 * interrupt polarity.
> +		 */
> +		phy_write(phydev, LAN8804_OUTPUT_CONTROL,
> +			  LAN8804_OUTPUT_CONTROL_INTR_BUFFER);

Small nit from me, you're missing error checks on the 2 above reads.

Thanks,

Maxime