Subject: Re: Could I (ab)use bus (struct bus_type) for virtual Broadcom bus?
From: George Kashperko <george@znau.edu.ua>
To: =?UTF-8?Q?Rafa=C5=82_Mi=C5=82ecki?= <zajec5@gmail.com>
Cc: Hauke Mehrtens <hauke@hauke-m.de>, Russell King <rmk@arm.linux.org.uk>,
        Arnd Bergmann <arnd@arndb.de>, linux-kernel@vger.kernel.org,
        linux-wireless@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        Arend van Spriel <arend@broadcom.com>,
        Jonas Gorski <jonas.gorski@gmail.com>, b43-dev@lists.infradead.org,
        Greg KH <greg@kroah.com>, Andy Botting <andy@andybotting.com>,
        Larry Finger <Larry.Finger@lwfinger.net>
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Date: Thu, 14 Apr 2011 16:15:00 +0300
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> W dniu 14 kwietnia 2011 14:34 użytkownik Hauke Mehrtens
> <hauke@hauke-m.de> napisał:
> > On 04/14/2011 02:04 PM, Rafał Miłecki wrote:
> >> Hauke: you were proposing integrating with drivers/amba. I really
> >> expect you to comment on this, please tell us how do you see this now,
> >> when we have better overview. I took your proposal seriously, you can
> >> see the results above.
> >
> > I had no closer look at drivers/amba and this bus driver, I just saw
> > that there was a discussion about drivers/amba and this implementation
> > with no result. When the Bradcom cores are not directly connected to
> > AMBA, but are using some sort of wrapper and there are no benefits in
> > using drivers/amba, just leave it.
> >
> > As the implementation of the Braodcom AIX Bus contains some Broadcom
> > extensions and there seams to be no normal AMBA device being connected
> > to some Broadcom devices with this special interface number 3) "Broadcom
> > specific bus (bcmai)" seams to the the best approach in my opinion.
> 
> Thanks for commenting.
> 
> Russell: you were asking:
> > What does this do which the 'amba' bus support doesn't?
> I believe I explained it well in this thread. Do you still think about
> using amba/driver? Do you think we should use it?
> 
> Arnd: I found you saying:
> > I believe the one thing we really want from this driver is the bus
> > scan code, which is not present in the amba bus implementation,
> I explained how it works, I believe scanning (EPROM in this case) it
> Broadcom specific, not really AMBA standard. How do you see it?
> 
It might not Broadcom specific as EPROM core seems to be CoreLink one
core and maybe is arm-developed. But it isn't documented publicly and we
don't know yet if it is obligatory for all amba (or at least axi)
interconnects or not.

Have nice day,
George


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