linux-kernel - Re: [PATCH v1 2/5] net: hpe: Add GXP UMAC MDIO

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Message-ID: <d53ae62c-b5e3-d543-d7e9-93cd59d43415@wanadoo.fr>
Date:   Fri, 21 Jul 2023 23:39:47 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     nick.hawkins@....com, verdun@....com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/5] net: hpe: Add GXP UMAC MDIO

Le 21/07/2023 à 23:20, nick.hawkins@....com a écrit :
> From: Nick Hawkins <nick.hawkins@....com>
> 
> The GXP contains two Universal Ethernet MACs that can be
> connected externally to several physical devices. From an external
> interface perspective the BMC provides two SERDES interface connections
> capable of either SGMII or 1000Base-X operation. The BMC also provides
> a RMII interface for sideband connections to external Ethernet controllers.
> 
> The primary MAC (umac0) can be mapped to either SGMII/1000-BaseX
> SERDES interface.  The secondary MAC (umac1) can be mapped to only
> the second SGMII/1000-Base X Serdes interface or it can be mapped for
> RMII sideband.
> 
> The MDIO(mdio0) interface from the primary MAC (umac0) is used for
> external PHY status and configuration. The MDIO(mdio1) interface from
> the secondary MAC (umac1) is routed to the SGMII/100Base-X IP blocks
> on the two SERDES interface connections.
> 
> Signed-off-by: Nick Hawkins <nick.hawkins@....com>
> ---

[...]

> +static int umac_mdio_probe(struct platform_device *pdev)
> +{
> +	struct resource *res;
> +	struct mii_bus *bus;
> +	struct umac_mdio_priv *umac_mdio;
> +
> +	int ret;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		dev_err(&pdev->dev, "fail to get resource\n");
> +		return -ENODEV;
> +	}
> +
> +	bus = devm_mdiobus_alloc_size(&pdev->dev,
> +				      sizeof(struct umac_mdio_priv));
> +	if (!bus) {
> +		dev_err(&pdev->dev, "failed to alloc mii bus\n");
> +		return -ENOMEM;
> +	}
> +
> +	snprintf(bus->id, MII_BUS_ID_SIZE, "%s", dev_name(&pdev->dev));
> +
> +	bus->name	= dev_name(&pdev->dev);
> +	bus->read	= umac_mdio_read,
> +	bus->write	= umac_mdio_write,
> +	bus->parent	= &pdev->dev;
> +	umac_mdio = bus->priv;
> +	umac_mdio->base = devm_ioremap_resource(&pdev->dev, res);
> +	if (!umac_mdio->base) {
> +		dev_err(&pdev->dev, "failed to do ioremap\n");
> +		return -ENODEV;
> +	}
> +
> +	platform_set_drvdata(pdev, umac_mdio);
> +
> +	ret = of_mdiobus_register(bus, pdev->dev.of_node);

devm_of_mdiobus_register()?

This makes the platform_set_drvdata() just above and umac_mdio_remove() 
useless.

CJ

> +
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "Cannot register MDIO bus (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int umac_mdio_remove(struct platform_device *pdev)
> +{
> +	struct mii_bus *bus = platform_get_drvdata(pdev);
> +
> +	if (bus)
> +		mdiobus_unregister(bus);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id umac_mdio_of_matches[] = {
> +	{ .compatible = "hpe,gxp-umac-mdio", },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, umac_mdio_of_matches);
> +
> +static struct platform_driver umac_driver = {
> +	.driver	= {
> +		.name    = "gxp-umac-mdio",
> +		.of_match_table = of_match_ptr(umac_mdio_of_matches),
> +	},
> +	.probe   = umac_mdio_probe,
> +	.remove  = umac_mdio_remove,
> +};
> +
> +module_platform_driver(umac_driver);
> +
> +MODULE_AUTHOR("Nick Hawkins <nick.hawkins@....com>");
> +MODULE_DESCRIPTION("HPE GXP UMAC MDIO driver");
> +MODULE_LICENSE("GPL");