linux-kernel - Re: [PATCH 1/4] net: phy: adin1100: Add initial support for ADIN1100 industrial PHY

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Message-ID: <YNS/mwLfM0M1ZOoQ@lunn.ch>
Date:   Thu, 24 Jun 2021 19:23:39 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     alexandru.tachici@...log.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, kuba@...nel.org, linux@...linux.org.uk,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: Re: [PATCH 1/4] net: phy: adin1100: Add initial support for ADIN1100
 industrial PHY

> +static int adin_config_init(struct phy_device *phydev)
> +{
> +	struct adin_priv *priv = phydev->priv;
> +	struct device *dev = &phydev->mdio.dev;
> +	int ret;
> +
> +	ret = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, ADIN_B10L_PMA_STAT);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* This depends on the voltage level from the power source */
> +	priv->tx_level_24v = !!(ret & ADIN_PMA_STAT_B10L_TX_LVL_HI_ABLE);
> +
> +	phydev_dbg(phydev, "PHY supports 2.4V TX level: %s\n",
> +		   priv->tx_level_24v ? "yes" : "no");
> +
> +	if (priv->tx_level_24v &&
> +	    device_property_present(dev, "adi,disable-2-4-v-tx-level")) {
> +		phydev_info(phydev,
> +			    "PHY supports 2.4V TX level, but disabled via config\n");
> +		priv->tx_level_24v = 0;

Please document this in the device tree binding. I also suspect Rob
will prefer something like adi,disable-2400mv-tx-level

       Andrew