linux-kernel - Re: [PATCH] DSA support for Micrel KSZ8895

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Date:   Wed, 6 Sep 2017 12:14:32 +0300
From:   Maxim Uvarov <muvarov@...il.com>
To:     Tristram.Ha@...rochip.com
Cc:     Pavel Machek <pavel@....cz>, Woojung.Huh@...rochip.com,
        Nathan Conrad <nathan.leigh.conrad@...il.com>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH] DSA support for Micrel KSZ8895

2017-08-31 0:32 GMT+03:00  <Tristram.Ha@...rochip.com>:
>> On Mon 2017-08-28 16:09:27, Andrew Lunn wrote:
>> > > I may be confused here, but AFAICT:
>> > >
>> > > 1) Yes, it has standard layout when accessed over MDIO.
>> >
>> >
>> > Section 4.8 of the datasheet says:
>> >
>> >     All the registers defined in this section can be also accessed
>> >     via the SPI interface.
>> >
>> > Meaning all PHY registers can be access via the SPI interface. So you
>> > should be able to make a standard Linux MDIO bus driver which performs
>> > SPI reads.
>>
>> As far as I can tell (and their driver confirms) -- yes, all those registers can be
>> accessed over the SPI, they are just shuffled around... hence MDIO
>> emulation code. I copied it from their code (see the copyrights) so no, I don't
>> believe there's nicer solution.
>>
>> Best regards,
>>
>>                                                                       Pavel
>
> Can you hold on your developing work on KSZ8895 driver?  I am afraid your effort may be in vain.  We at Microchip are planning to release DSA drivers for all KSZ switches, starting at KSZ8795, then KSZ8895, and KSZ8863.
>
> The driver files all follow the structures of the current KSZ9477 DSA driver, and the file tag_ksz.c will be updated to handle the tail tag of different chips, which requires including the ksz_priv.h header.  That is required nevertheless to support using the offload_fwd_mark indication.
>
> The KSZ8795 driver will be submitted after Labor Day (9/4) if testing reveals no problem.  The KSZ8895 driver will be submitted right after that.  You should have no problem using the driver right away.
>

Hello Tristram, is there any update for that driver?

Maxim.


> Tristram Ha
> Principal Software Engineer
> Microchip Technology Inc.
>



-- 
Best regards,
Maxim Uvarov