netdev - Re: [PATCH net-next v3 2/9] ravb: Add struct ravb_hw

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Date:   Fri, 20 Aug 2021 21:15:50 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Biju Das <biju.das.jz@...renesas.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Shtylyov <s.shtylyov@...russia.ru>,
        "Adam Ford" <aford173@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Yuusuke Ashizuka <ashiduka@...itsu.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH net-next v3 2/9] ravb: Add struct ravb_hw_info to driver
 data

On 8/19/21 8:33 PM, Biju Das wrote:

[...]
>>> The DMAC and EMAC blocks of Gigabit Ethernet IP found on RZ/G2L SoC
>>> are similar to the R-Car Ethernet AVB IP. With a few changes in the
>>> driver we can support both IPs.
>>>
>>> This patch adds the struct ravb_hw_info to hold hw features, driver
>>> data and function pointers to support both the IPs. It also replaces
>>> the driver data chip type with struct ravb_hw_info by moving chip type
>> to it.
>>>
>>> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
>>> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>>> Reviewed-by: Andrew Lunn <andrew@...n.ch>
[...]
>>> reg) diff --git a/drivers/net/ethernet/renesas/ravb_main.c
>>> b/drivers/net/ethernet/renesas/ravb_main.c
>>> index 94eb9136752d..b6554e5e13af 100644
>>> --- a/drivers/net/ethernet/renesas/ravb_main.c
>>> +++ b/drivers/net/ethernet/renesas/ravb_main.c
>> [...]
>>> @@ -2113,7 +2122,7 @@ static int ravb_probe(struct platform_device
>> *pdev)
>>>  		}
>>>  	}
>>>
>>> -	priv->chip_id = chip_id;
>>> +	priv->chip_id = info->chip_id;
>>
>>    Do we still need priv->chip_id?
> 
> The patch currently merged is preparation patch, subsequent patch will replace
> all the chip_id in ravb_main with hardware features and driver features.
> After that both priv->chip_id and info_chipid is not required for ravb_main.c
> 
> However ptp driver[1] still uses it, by adding a feature bit we can replace
> that as well. So going forward, there won't be any priv->chip_id or info->chip_id.
> 
> Does it makes sense?
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/ethernet/renesas/ravb_ptp.c?h=v5.14-rc6#n200

   OK, seems sane, go ahead. :-)

> Regards,
> Biju

MBR, Sergey