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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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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