From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= Date: Thu, 14 Apr 2011 15:45:05 +0200 Subject: Could I (ab)use bus (struct bus_type) for virtual Broadcom bus? In-Reply-To: <1302786900.21965.52.camel@dev.znau.edu.ua> References: <1302781431.21145.6.camel@dev.znau.edu.ua> <4DA6E9BD.3090404@hauke-m.de> <1302786900.21965.52.camel@dev.znau.edu.ua> Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-arm-kernel@lists.infradead.org W dniu 14 kwietnia 2011 15:15 u?ytkownik George Kashperko napisa?: > >> W dniu 14 kwietnia 2011 14:34 u?ytkownik Hauke Mehrtens >> napisa?: >> > On 04/14/2011 02:04 PM, Rafa? Mi?ecki 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. Maybe EPROM is not Broadcom specific, but I suspect the content we deal with in bcmai/axi is Broadcom specific. I didn't see any notes of manuf/id/rev/class we deal with. So I guess everything *we* (out driver) read from EPROM is Bcm specific. -- Rafa?