netdev - Re: [PATCH net-next-2.6 v3 1/1] can: c_can: Added support for Bosch C

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Message-ID: <4D2CDE49.3030302@pengutronix.de>
Date:	Tue, 11 Jan 2011 23:48:41 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Wolfram Sang <w.sang@...gutronix.de>
CC:	Wolfgang Grandegger <wg@...ndegger.com>,
	Bhupesh SHARMA <bhupesh.sharma@...com>,
	"Socketcan-core@...ts.berlios.de" <Socketcan-core@...ts.berlios.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Oliver Hartkopp <socketcan@...tkopp.net>
Subject: Re: [PATCH net-next-2.6 v3 1/1] can: c_can: Added support for Bosch
 C_CAN controller

On 01/11/2011 11:38 PM, Wolfram Sang wrote:
> On Tue, Jan 11, 2011 at 11:01:47PM +0100, Marc Kleine-Budde wrote:
>> On 01/11/2011 07:25 PM, Wolfgang Grandegger wrote:
>>
>> [...]
>>
>>> I was told that Bosch's page for the C_CAN is here:
>>>
>>>  http://www.semiconductors.bosch.de/en/ipmodules/can/canipmodules/c_can/c_can.asp
>>>
>>> There it's also written for what bus interfaces the C_CAN is available for, e.g.:
>>>
>>>   "The ASIC version is delivered with the AMBA APB bus interface from ARM."
>>
>> On ARM we also have the AMBA bus abstraction in Linux, but I've never
>> worked with it. IIRC Wolfram (Cc'ed) has recently touched it.
> 
> For a programmer, it feels very much like a platform-bus (you can even use
> amba-devices on a platform_bus); it has the advantage of some identification
> registers at the end of the address-space. The rest is more about how to
> connect the core to the SoC. Does that help? I don't know what the actual
> question is :)

No real question so far. Bhupesh is hacking a generic c_can driver and
platform bus bindings. The question might be do we need the platform bus
bindings or is it better to have AMBA bindings? The platform driver
supports 16 and 32 bit attached devices, via IORESOURCE_MEM_{16,32}BIT.

Where do we have to look for the AMBA id registers?

cheers, Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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