linux-kernel - Re: [PATCH net-next] net: dsa: remove OF-based MDIO bus registration from DSA core

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Date: Mon, 29 Jan 2024 08:08:28 -0800
From: Florian Fainelli <f.fainelli@...il.com>
To: Arınç ÜNAL <arinc.unal@...nc9.com>,
 Vladimir Oltean <olteanv@...il.com>,
 Luiz Angelo Daros de Luca <luizluca@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, mithat.guner@...ont.com,
 erkin.bozoglu@...ont.com, Alvin Šipraga
 <ALSI@...g-olufsen.dk>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: dsa: remove OF-based MDIO bus registration
 from DSA core



On 1/29/2024 7:53 AM, Arınç ÜNAL wrote:
> On 29.01.2024 17:56, Vladimir Oltean wrote:
>> On Sat, Jan 27, 2024 at 11:23:33PM -0300, Luiz Angelo Daros de Luca 
>> wrote:
>>>>> IIUC, Luiz made the original patch for the realtek switches. Shouldn't
>>>>> we wait until realtek registers ds->user_mii_bus on its own, before
>>>>> reverting? Otherwise, you're basically saying that Luiz made the DSA
>>>>> core patch without needing it.
>>>>
>>>> My findings point to that. Luiz made the patch to optionally 
>>>> register the
>>>> MDIO bus of the MDIO controlled Realtek switches OF-based. So it's not
>>>> necessary to wait.
>>>
>>> Back in the time when I wrote that code, with the phy_read/write in
>>> dsa_switch_ops, the OF node was only required to associate IRQ to each
>>> port. Until my patch to register its own mdiobus driver lands (I hope
>>> that happens before the next version), the port status will fall back
>>> to polling. I don't think it is a critical feature but I'll let the
>>> maintainers decide. ACK for me.
>>>
>>> Regards,
>>>
>>> Luiz
>>
>> It isn't really great that this loses IRQ support for Realtek internal 
>> PHYs,
>> especially since Arınç's commit message did not estimate this would 
>> happen.
>>
>> I don't see why this patch could not wait until you resubmit the realtek
>> consolidation set and it gets accepted.
> 
> I agree. I didn't anticipate that realtek-mdio didn't set IRQs on PHYs for
> the MDIO bus registered non-OF-based. I'd much rather wait and then send v2
> with the mention to realtek-mdio removed.

Sounds good, thanks!
-- 
Florian