netdev - Re: [PATCH v2 1/2] net: phy: adin: enable configuration of the LP Termination Register

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Message-ID: <a587cedd-9450-4c58-bc39-ecbdd525ef65@lunn.ch>
Date: Tue, 23 Dec 2025 10:36:10 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Osose Itua <osose.itua@...oirfairelinux.com>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, michael.hennerich@...log.com,
	jerome.oufella@...oirfairelinux.com
Subject: Re: [PATCH v2 1/2] net: phy: adin: enable configuration of the LP
 Termination Register

> +static int adin_config_zptm100(struct phy_device *phydev)
> +{
> +	struct device *dev = &phydev->mdio.dev;
> +	int reg;
> +	int rc;
> +
> +	if (!(device_property_read_bool(dev, "adi,low-cmode-impedance")))
> +		return 0;
> +
> +	/* set to 0 to configure for lowest common-mode impedance */
> +	rc = phy_write_mmd(phydev, MDIO_MMD_VEND1, ADIN1300_B_100_ZPTM_DIMRX, 0x0);
> +	if (rc < 0)
> +		return rc;
> +
> +	reg = phy_read_mmd(phydev, MDIO_MMD_VEND1, ADIN1300_B_100_ZPTM_DIMRX);
> +	if (reg < 0)
> +		return reg;
> +
> +	if (!(reg & ADIN1300_B_100_ZPTM_EN_DIMRX)) {
> +		phydev_err(phydev, "Failed to set lowest common-mode impedance.\n");
> +		return -EINVAL;
> +	}

Under what condition do you think this could happen? Do you think
there are variants of the hardware which do not have this register?

	Andrew