linux-kernel - Re: [PATCH] drivers: brcmaxi: provide amba axi functionality in separate module

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Date:	Sat, 23 Apr 2011 17:07:19 +0200
From:	"Arend van Spriel" <arend@...adcom.com>
To:	"Jonas Gorski" <jonas.gorski@...il.com>
cc:	"Arnd Bergmann" <arnd@...db.de>,
	"zajec5@...il.com" <zajec5@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"b43-dev@...ts.infradead.org" <b43-dev@...ts.infradead.org>,
	"George Kashperko" <george@...u.edu.ua>,
	"Hauke Mehrtens" <hauke@...ke-m.de>,
	"Russell King" <rmk@....linux.org.uk>,
	"Larry Finger" <Larry.Finger@...inger.net>,
	"Andy Botting" <andy@...ybotting.com>, "Greg KH" <greg@...ah.com>,
	"Michael Buesch" <m@...s.ch>
Subject: Re: [PATCH] drivers: brcmaxi: provide amba axi functionality in
 separate module

On Sat, 23 Apr 2011 14:33:21 +0200, Jonas Gorski <jonas.gorski@...il.com>  
wrote:

> On 21 April 2011 16:38, Arend van Spriel <arend@...adcom.com> wrote:
>> Would it be possible to make chipcommon driver optional (not doing the
>> initialization)?
>
> This would need to be done on a per-device/bus basis, at least for
> embedded. Consider the following setup (which is quite common for dual
> band routers):
>
> BCM4718 (bus A)
   +- MIPS74k
> +- Common Core <- provides flash write access, GPIOs, watchdog, ...
> +- 802.11 Core <- for 2.4Ghz wifi
> +- PCIe Core
>   + BCM43224 (bus B)
>     +- Common Core
>     +- 802.11 Core <- for 5Ghz wifi
>
> (I omitted any cores not relevant for the example)

The MIPS may be relevant as well ;-)

In the example above I would expect two axi bus driver instances for bus A  
and bus B.

> So eventually you want to able to drive both 802.11 cores, but can't
> exclusively claim both common cores.

I would expect to be probed twice. One call for 2.4GHz 802.11 core  
referencing to bus A and one call for 5GHz 802.11 core referencing to bus  
B.

Regarding chipcommon I agree that it requires one init sequence per  
device. I would just like to have the option to provide a custom  
initialization function for chip common (and possibly pcie) somehow.

Gr. AvS
-- 
"The world is indeed comic, but the joke is on mankind." — H.P. Lovecraft

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