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

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Message-ID: <ZL6Ntazi84za5YX+@corigine.com>
Date:   Mon, 24 Jul 2023 16:41:57 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     nick.hawkins@....com
Cc:     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

On Fri, Jul 21, 2023 at 04:20:41PM -0500, nick.hawkins@....com wrote:

...

Hi Nick,

> +static int umac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
> +{
> +	struct umac_mdio_priv *umac_mdio = bus->priv;
> +	unsigned int value;
> +	unsigned int status;

Please use reverse xmas tree - longest line to shortest - for
local variable declarations in new Networking code.

...

> +static int umac_mdio_probe(struct platform_device *pdev)
> +{
> +	struct resource *res;
> +	struct mii_bus *bus;
> +	struct umac_mdio_priv *umac_mdio;

Ditto.

> +
> +	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,

Should the comas (',') on the two lines above be semicolons (';') ?

> +	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);
> +
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "Cannot register MDIO bus (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}

...