netdev - Re: [Uclinux-dist-devel] [PATCH 2/2] net: dsa: introduce MICREL KSZ8893MQL/BL ethernet switch chip support

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Message-ID: <AANLkTikoSb8WA40teXaYvaPf1XsC4r7ySWZOBTKug4ip@mail.gmail.com>
Date:	Wed, 21 Jul 2010 17:00:25 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Karl Beldan <karl.beldan@...il.com>
Cc:	Lennert Buytenhek <buytenh@...tstofly.org>, netdev@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [Uclinux-dist-devel] [PATCH 2/2] net: dsa: introduce MICREL 
	KSZ8893MQL/BL ethernet switch chip support

On Wed, Jul 21, 2010 at 16:31, Karl Beldan wrote:
> On Wed, Jul 21, 2010 at 6:05 PM, Mike Frysinger wrote:
>> On Wed, Jul 21, 2010 at 11:16, Lennert Buytenhek wrote:
>>> On Wed, Jul 21, 2010 at 09:37:22AM -0400, Mike Frysinger wrote:
>>>> +static int ksz8893m_setup(struct dsa_switch *ds)
>>>> +{
>>>> +     int i;
>>>> +     int ret;
>>>> +
>>>> +     ret = ksz8893m_switch_reset(ds);
>>>> +     if (ret < 0)
>>>> +             return ret;
>>>
>>> It's pretty ugly that the mdiobus is passed in via the normal means,
>>> but a reference to the SPI bus to use is just stuffed into some global
>>> variable.
>>>
>>> Can you not access all registers via MII?
>>
>> it depends on the host mdio bus.  if it supports the semi-standard
>> behavior of toggling the OP field of MDIO frames, then yes, you can do
>> it via MII.  but i dont think the current mdio framework in the kernel
>> keeps track of that functionality, so there isnt a way in the driver
>> to say "is this possible, else fall back to SPI".
>
> Are you referring to SMI ?

that is the term the ksz datasheet uses (Serial Management Interface),
but i'm not aware of it being a standardized term.  even the ksz
datasheet admits that its behavior is a bit non-standard.  the
Blackfin MAC doesnt support it so we have no way of testing the it as
that is the MAC on the board with the ksz switch.
-mike
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