linux-kernel - Re: [PATCH net-next v4 11/12] microchip: lan865x: add driver support for Microchip's LAN865X MAC-PHY

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Date: Wed, 24 Apr 2024 02:27:26 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, horms@...nel.org, saeedm@...dia.com,
	anthony.l.nguyen@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, corbet@....net,
	linux-doc@...r.kernel.org, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	devicetree@...r.kernel.org, horatiu.vultur@...rochip.com,
	ruanjinjie@...wei.com, steen.hegelund@...rochip.com,
	vladimir.oltean@....com, UNGLinuxDriver@...rochip.com,
	Thorsten.Kummermehr@...rochip.com, Pier.Beruto@...emi.com,
	Selvamani.Rajagopal@...emi.com, Nicolas.Ferre@...rochip.com,
	benjamin.bigler@...nformulastudent.ch
Subject: Re: [PATCH net-next v4 11/12] microchip: lan865x: add driver support
 for Microchip's LAN865X MAC-PHY

> +/* OPEN Alliance Configuration Register #0 */
> +#define OA_TC6_REG_CONFIG0		0x0004
> +#define CONFIG0_ZARFE_ENABLE		BIT(12)

If this is a standard register, you should put these defined where
other drivers can use them.

> +static int lan865x_set_mac_address(struct net_device *netdev, void *addr)
> +{
> +	struct lan865x_priv *priv = netdev_priv(netdev);
> +	struct sockaddr *address = addr;
> +	int ret;
> +
> +	ret = eth_prepare_mac_addr_change(netdev, addr);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (ether_addr_equal(address->sa_data, netdev->dev_addr))
> +		return 0;
> +
> +	ret = lan865x_set_hw_macaddr(priv, address->sa_data);
> +	if (ret)
> +		return ret;
> +
> +	eth_hw_addr_set(netdev, address->sa_data);

It seems more normal to call eth_commit_mac_addr_change(), which
better pairs with eth_prepare_mac_addr_change().

> +static int lan865x_set_zarfe(struct lan865x_priv *priv)
> +{
> +	u32 regval;
> +	int ret;
> +
> +	ret = oa_tc6_read_register(priv->tc6, OA_TC6_REG_CONFIG0, &regval);
> +	if (ret)
> +		return ret;
> +
> +	/* Set Zero-Align Receive Frame Enable */
> +	regval |= CONFIG0_ZARFE_ENABLE;
> +
> +	return oa_tc6_write_register(priv->tc6, OA_TC6_REG_CONFIG0, regval);
> +}

There does not appear to be anything specific to your device here. So
please make this a helper in the shared code, so any driver can use
it.

	Andrew