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From: Andrew Lunn <andrew@lunn.ch>
To: Joel Stanley <joel@jms.id.au>
Cc: "David S . Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Stafford Horne <shorne@gmail.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Anton Blanchard <anton@ozlabs.org>,
	Gabriel Somlo <gsomlo@gmail.com>, David Shah <dave@ds0.me>,
	Karol Gugala <kgugala@antmicro.com>,
	Mateusz Holenko <mholenko@antmicro.com>,
	devicetree@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] net: Add driver for LiteX's LiteETH network interface
Date: Sat, 7 Aug 2021 21:19:42 +0200	[thread overview]
Message-ID: <YQ7czmvIm6FTZAol@lunn.ch> (raw)
In-Reply-To: <20210806054904.534315-3-joel@jms.id.au>

> +static void liteeth_reset_hw(struct liteeth *priv)
> +{
> +	/* Reset, twice */
> +	writeb(0, priv->base + LITEETH_PHY_CRG_RESET);
> +	udelay(10);
> +	writeb(1, priv->base + LITEETH_PHY_CRG_RESET);
> +	udelay(10);
> +	writeb(0, priv->base + LITEETH_PHY_CRG_RESET);
> +	udelay(10);

What is this actually resetting?

> +static int liteeth_probe(struct platform_device *pdev)
> +{
> +	struct net_device *netdev;
> +	void __iomem *buf_base;
> +	struct resource *res;
> +	struct liteeth *priv;
> +	int irq, err;
> +
> +	netdev = alloc_etherdev(sizeof(*priv));
> +	if (!netdev)
> +		return -ENOMEM;
> +
> +	priv = netdev_priv(netdev);
> +	priv->netdev = netdev;
> +	priv->dev = &pdev->dev;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(&pdev->dev, "Failed to get IRQ\n");
> +		goto err;
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	priv->base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(priv->base)) {
> +		err = PTR_ERR(priv->base);
> +		goto err;
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	priv->mdio_base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(priv->mdio_base)) {
> +		err = PTR_ERR(priv->mdio_base);
> +		goto err;
> +	}

So you don't have any PHY handling, or any MDIO bus master code. So i
would drop this, until the MDIO architecture question is answered. I
also wonder how much use the MAC driver is without any PHY code?
Unless you have a good reason, i don't think we should merge this
until it makes the needed calls into phylib. It is not much code to
add.

	Andrew

  parent reply	other threads:[~2021-08-07 19:19 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-06  5:49 [PATCH 0/2] net: Add LiteETH network driver Joel Stanley
2021-08-06  5:49 ` [PATCH 1/2] dt-bindings: net: Add bindings for LiteETH Joel Stanley
2021-08-06 17:07   ` Rob Herring
2021-08-07 19:05   ` Andrew Lunn
2021-08-09  7:59     ` Joel Stanley
2021-08-09 13:27       ` Andrew Lunn
2021-08-06  5:49 ` [PATCH 2/2] net: Add driver for LiteX's LiteETH network interface Joel Stanley
2021-08-06 11:48   ` Gabriel L. Somlo
     [not found]     ` <CA+96J6JxAkNd_QkVxfSdAJwWVLJTtSaDsCmVKw3KBfYySJytKA@mail.gmail.com>
2021-08-20  7:46       ` Joel Stanley
2021-08-06 23:10   ` Jakub Kicinski
2021-08-09 12:03     ` Joel Stanley
2021-08-09 16:16       ` Jakub Kicinski
2021-08-07 19:19   ` Andrew Lunn [this message]
2021-08-09  3:20     ` Joel Stanley
2021-08-09 13:09       ` Andrew Lunn

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