linux-kernel - Re: [PATCH net-next v3 5/5] net: phy: add driver for built-in 2.5G ethernet PHY on MT7988

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Date: Mon, 20 May 2024 15:35:30 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Sky Huang <SkyLake.Huang@...iatek.com>
Cc: 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>,
	Daniel Golle <daniel@...rotopia.org>,
	Qingfang Deng <dqfext@...il.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Steven Liu <Steven.Liu@...iatek.com>
Subject: Re: [PATCH net-next v3 5/5] net: phy: add driver for built-in 2.5G
 ethernet PHY on MT7988

> +static int mt798x_2p5ge_phy_config_init(struct phy_device *phydev)
> +{
> +	struct mtk_i2p5ge_phy_priv *priv = phydev->priv;
> +	struct device *dev = &phydev->mdio.dev;
> +	const struct firmware *fw;
> +	struct pinctrl *pinctrl;
> +	int ret, i;
> +	u16 reg;
> +
> +	if (!priv->fw_loaded) {
> +		if (!priv->md32_en_cfg_base || !priv->pmb_addr) {
> +			dev_err(dev, "MD32_EN_CFG base & PMB addresses aren't valid\n");
> +			return -EINVAL;
> +		}

..

> +static int mt798x_2p5ge_phy_probe(struct phy_device *phydev)
> +{
> +	struct mtk_i2p5ge_phy_priv *priv;
> +
> +	priv = devm_kzalloc(&phydev->mdio.dev,
> +			    sizeof(struct mtk_i2p5ge_phy_priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	switch (phydev->drv->phy_id) {
> +	case MTK_2P5GPHY_ID_MT7988:
> +		priv->pmb_addr = ioremap(MT7988_2P5GE_PMB_BASE, MT7988_2P5GE_PMB_LEN);
> +		if (!priv->pmb_addr)
> +			return -ENOMEM;
> +		priv->md32_en_cfg_base = ioremap(MT7988_2P5GE_MD32_EN_CFG_BASE,
> +						 MT7988_2P5GE_MD32_EN_CFG_LEN);
> +		if (!priv->md32_en_cfg_base)
> +			return -ENOMEM;
> +
> +		/* The original hardware only sets MDIO_DEVS_PMAPMD */
> +		phydev->c45_ids.mmds_present |= (MDIO_DEVS_PCS | MDIO_DEVS_AN |
> +						 MDIO_DEVS_VEND1 | MDIO_DEVS_VEND2);
> +		break;
> +	default:
> +		return -EINVAL;
> +	}

How can priv->md32_en_cfg_base or priv->pmb_addr not be set in
mt798x_2p5ge_phy_config_init()

	Andrew