netdev - Re: [PATCH net-next v7 2/5] net: spacemit: Add K1 Ethernet MAC

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Message-ID: <eb127fd167cfbd885099a7c4c962eb1135a5a8a0.camel@pengutronix.de>
Date: Tue, 26 Aug 2025 10:54:31 +0200
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Vivian Wang <wangruikang@...as.ac.cn>, Andrew Lunn
 <andrew+netdev@...n.ch>,  Jakub Kicinski <kuba@...nel.org>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Yixun Lan <dlan@...too.org>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Paul Walmsley <paul.walmsley@...ive.com>, Palmer
 Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, Alexandre
 Ghiti <alex@...ti.fr>
Cc: Vivian Wang <uwu@...m.page>, Vadim Fedorenko
 <vadim.fedorenko@...ux.dev>,  Junhui Liu <junhui.liu@...moral.tech>, Simon
 Horman <horms@...nel.org>, Maxime Chevallier
 <maxime.chevallier@...tlin.com>, netdev@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 spacemit@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v7 2/5] net: spacemit: Add K1 Ethernet MAC

On Di, 2025-08-26 at 14:23 +0800, Vivian Wang wrote:
> The Ethernet MACs found on SpacemiT K1 appears to be a custom design
> that only superficially resembles some other embedded MACs. SpacemiT
> refers to them as "EMAC", so let's just call the driver "k1_emac".
> 
> Supports RGMII and RMII interfaces. Includes support for MAC hardware
> statistics counters. PTP support is not implemented.
> 
> Tested-by: Junhui Liu <junhui.liu@...moral.tech>
> Signed-off-by: Vivian Wang <wangruikang@...as.ac.cn>
> Reviewed-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
> Reviewed-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
> ---
>  drivers/net/ethernet/Kconfig            |    1 +
>  drivers/net/ethernet/Makefile           |    1 +
>  drivers/net/ethernet/spacemit/Kconfig   |   29 +
>  drivers/net/ethernet/spacemit/Makefile  |    6 +
>  drivers/net/ethernet/spacemit/k1_emac.c | 2193 +++++++++++++++++++++++++++++++
>  drivers/net/ethernet/spacemit/k1_emac.h |  426 ++++++
>  6 files changed, 2656 insertions(+)
> 
[...]
> diff --git a/drivers/net/ethernet/spacemit/k1_emac.c b/drivers/net/ethernet/spacemit/k1_emac.c
> new file mode 100644
> index 0000000000000000000000000000000000000000..9e558d5893cfbbda0baa7ad21a7209dadda9487e
> --- /dev/null
> +++ b/drivers/net/ethernet/spacemit/k1_emac.c
> @@ -0,0 +1,2193 @@
[...]
> +static int emac_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct reset_control *reset;
> +	struct net_device *ndev;
> +	struct emac_priv *priv;
> +	int ret;
> +
> +	ndev = devm_alloc_etherdev(dev, sizeof(struct emac_priv));
> +	if (!ndev)
> +		return -ENOMEM;
> +
> +	ndev->hw_features = NETIF_F_SG;
> +	ndev->features |= ndev->hw_features;
> +
> +	ndev->max_mtu = EMAC_RX_BUF_4K - (ETH_HLEN + ETH_FCS_LEN);
> +
> +	priv = netdev_priv(ndev);
> +	priv->ndev = ndev;
> +	priv->pdev = pdev;
> +	platform_set_drvdata(pdev, priv);
> +
> +	ret = emac_config_dt(pdev, priv);
> +	if (ret < 0) {
> +		dev_err_probe(dev, ret, "Configuration failed\n");
> +		goto err;

I'd just
		return dev_err_probe(...);
here.

> +	}
> +
> +	ndev->watchdog_timeo = 5 * HZ;
> +	ndev->base_addr = (unsigned long)priv->iobase;
> +	ndev->irq = priv->irq;
> +
> +	ndev->ethtool_ops = &emac_ethtool_ops;
> +	ndev->netdev_ops = &emac_netdev_ops;
> +
> +	devm_pm_runtime_enable(&pdev->dev);
> +
> +	priv->bus_clk = devm_clk_get_enabled(&pdev->dev, NULL);
> +	if (IS_ERR(priv->bus_clk)) {
> +		ret = dev_err_probe(dev, PTR_ERR(priv->bus_clk),
> +				    "Failed to get clock\n");
> +		goto err;

Same here.

> +	}
> +
> +	reset = devm_reset_control_get_optional_exclusive_deasserted(&pdev->dev,
> +								     NULL);
> +	if (IS_ERR(reset)) {
> +		ret = dev_err_probe(dev, PTR_ERR(reset),
> +				    "Failed to get reset\n");
> +		goto err;

And here.

> +	}
> +
> +	emac_sw_init(priv);
> +
> +	if (of_phy_is_fixed_link(dev->of_node)) {
> +		ret = of_phy_register_fixed_link(dev->of_node);
> +		if (ret) {
> +			dev_err_probe(dev, ret,
> +				      "Failed to register fixed-link");
> +			goto err_timer_delete;

If you can move this section before emac_sw_init(), this could also
just return.

> +		}

Then here a function calling of_phy_deregister_fixed_link() could be
registered with devm_add_action_or_reset(), to avoid duplicated cleanup
in the error path and in emac_remove().

regards
Philipp