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: Fri, 26 Apr 2024 13:32:22 +0000
From: <Parthiban.Veerasooran@...rochip.com>
To: <andrew@...n.ch>
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

Hi Andrew,

On 24/04/24 5:57 am, Andrew Lunn wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
>> +/* 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.
OK. Will move it to oa_tc6.c in the next version as you have also 
suggested to use this as a helper function in the below comment.
> 
>> +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().
OK, so I will replace eth_hw_addr_set() with 
eth_prepare_mac_addr_change() in the next version.
> 
>> +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.
OK, I will implement this helper function as oa_tc6_enable_zarfe() in 
the oa_tc6.c. Also do you want me to move this helper function 
implementation to a new patch?

Best regards,
Parthiban V
> 
>          Andrew
>