netdev - Re: [PATCH 0/1] net: dsa: b53: mmap: add dsa switch ops

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Date:   Thu, 23 Mar 2023 12:45:16 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Álvaro Fernández Rojas <noltari@...il.com>
Cc:     jonas.gorski@...il.com, andrew@...n.ch, olteanv@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, linux@...linux.org.uk, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] net: dsa: b53: mmap: add dsa switch ops

On 3/23/23 12:42, Álvaro Fernández Rojas wrote:
> El jue, 23 mar 2023 a las 19:19, Florian Fainelli
> (<f.fainelli@...il.com>) escribió:
>>
>> On 3/23/23 10:02, Álvaro Fernández Rojas wrote:
>>> B53 MMAP switches have a MDIO Mux bus controller which should be used instead
>>> of the default phy_read/phy_write ops used in the rest of the B53 controllers.
>>> Therefore, in order to use the proper MDIO Mux bus controller we need to
>>> replicate the default B53 DSA switch ops removing the phy_read/phy_write
>>> entries.
>>
>> Did you try to implement b53_mmap_ops::phy_read16/phy_write16 and have
>> them return -EIO such that you do not fallback to the else path:
> 
> Actually I tried -EINVAL and it didn't work, but I've just tried -EIO
> and it works!
> Many thanks for the suggestion!
> 
> I will send another patch adding phy_read/write ops and returning
> -EIO, so please ignore this patch and sorry for the noise, but it took
> a while until we reached a good solution for this :(...

No worries, -EIO works because it is treated specially through the PHY 
library to indicate a read error occurred, whereas the other return 
codes do not necessarily produce that effect.

Thanks for your persistence!
-- 
Florian