netdev - Re: [PATCH] DSA support for Micrel KSZ8895

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Date:   Tue, 29 Aug 2017 09:45:47 +0200
From:   Pavel Machek <pavel@....cz>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Woojung.Huh@...rochip.com, nathan.leigh.conrad@...il.com,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tristram.Ha@...rel.com
Subject: Re: [PATCH] DSA support for Micrel KSZ8895

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
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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