netdev - Re: [PATCH 21/21] net: macb: add support for gmac to sam9x7

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Date: Mon, 5 Jun 2023 15:34:26 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Nicolas Ferre <nicolas.ferre@...rochip.com>,
 Varshini Rajendran <varshini.rajendran@...rochip.com>, tglx@...utronix.de,
 maz@...nel.org, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
 conor+dt@...nel.org, alexandre.belloni@...tlin.com,
 claudiu.beznea@...rochip.com, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, gregkh@...uxfoundation.org,
 linux@...linux.org.uk, mturquette@...libre.com, sboyd@...nel.org,
 sre@...nel.org, broonie@...nel.org, arnd@...db.de,
 gregory.clement@...tlin.com, sudeep.holla@....com,
 balamanikandan.gunasundar@...rochip.com, mihai.sain@...rochip.com,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
 linux-usb@...r.kernel.org, linux-clk@...r.kernel.org,
 linux-pm@...r.kernel.org
Cc: Hari.PrasathGE@...rochip.com, cristian.birsan@...rochip.com,
 durai.manickamkr@...rochip.com, manikandan.m@...rochip.com,
 dharma.b@...rochip.com, nayabbasha.sayed@...rochip.com,
 balakrishnan.s@...rochip.com
Subject: Re: [PATCH 21/21] net: macb: add support for gmac to sam9x7

On 05/06/2023 14:07, Nicolas Ferre wrote:
> On 05/06/2023 at 08:42, Krzysztof Kozlowski wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>
>> On 03/06/2023 22:02, Varshini Rajendran wrote:
>>> From: Nicolas Ferre <nicolas.ferre@...rochip.com>
>>>
>>> Add support for GMAC in sam9x7 SoC family
>>>
>>> Signed-off-by: Varshini Rajendran <varshini.rajendran@...rochip.com>
>>> Signed-off-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
>>> ---
>>>   drivers/net/ethernet/cadence/macb_main.c | 1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
>>> index 29a1199dad14..609c8e9305ba 100644
>>> --- a/drivers/net/ethernet/cadence/macb_main.c
>>> +++ b/drivers/net/ethernet/cadence/macb_main.c
>>> @@ -4913,6 +4913,7 @@ static const struct of_device_id macb_dt_ids[] = {
>>>        { .compatible = "microchip,mpfs-macb", .data = &mpfs_config },
>>>        { .compatible = "microchip,sama7g5-gem", .data = &sama7g5_gem_config },
>>>        { .compatible = "microchip,sama7g5-emac", .data = &sama7g5_emac_config },
>>> +     { .compatible = "microchip,sam9x7-gem", .data = &sama7g5_gem_config },
>>
>> These are compatible, aren't they? Why do you need new entry?
> 
> The hardware itself is different, even if the new features are not 
> supported yet in the macb driver.
> The macb driver will certainly evolve in order to add these features so 
> we decided to match a new compatible string all the way to the driver.

You claim to be fully compatible with sama7g5-gem, so adding new
features does not warrant not-reusing old match entry now.

Best regards,
Krzysztof