netdev - Re: [MeeGo-Dev][PATCH] Topcliff: Update PCH

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Date:	Thu, 12 Aug 2010 11:03:52 +0200
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	"Wang, Qi" <qi.wang@...el.com>
CC:	Daniel Baluta <daniel.baluta@...il.com>,
	Masayuki Ohtak <masa-korg@....okisemi.com>,
	"meego-dev@...go.com" <meego-dev@...go.com>,
	"socketcan-core@...ts.berlios.de" <socketcan-core@...ts.berlios.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Khor, Andrew Chih Howe" <andrew.chih.howe.khor@...el.com>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Wang, Yong Y" <yong.y.wang@...el.com>
Subject: Re: [MeeGo-Dev][PATCH] Topcliff: Update PCH_CAN driver to 2.6.35

On 08/12/2010 03:42 AM, Wang, Qi wrote:
>> -----Original Message-----
>> From: Daniel Baluta [mailto:daniel.baluta@...il.com]
>> Sent: Wednesday, August 11, 2010 6:37 PM
>> To: Masayuki Ohtak
>> Cc: meego-dev@...go.com; Wolfgang Grandegger;
>> socketcan-core@...ts.berlios.de; netdev@...r.kernel.org; Khor, Andrew Chih
>> Howe; gregkh@...e.de; arjan@...ux.intel.com; Wang, Qi; Wang, Yong Y
>> Subject: Re: [MeeGo-Dev][PATCH] Topcliff: Update PCH_CAN driver to 2.6.35
>>
>> Hi,
>>
>> 2010/8/11 Masayuki Ohtak <masa-korg@....okisemi.com>:
>>> CAN driver of Topcliff PCH
>>>
>>> Topcliff PCH is the platform controller hub that is going to be used in
>>> Intel's upcoming general embedded platform. All IO peripherals in
>>> Topcliff PCH are actually devices sitting on AMBA bus.
>>> Topcliff PCH has CAN I/F. This driver enables CAN function.
>>>
>>> Signed-off-by: Masayuki Ohtake <masa-korg@....okisemi.com>
>>
>> I have a few questions:
>>
>> 1. Is your code based on Intel's CAN EP80579 ([1]) ?
> No.

For curiosity, is the controller similar to the OKI MSM9225 or ML9620?

>> 2. Why don't you use kernel existing kfifo infrastructure? ([2]).
> Just take a look at kfifo.h. This structure has been changed. I remembered there was a spin_lock from kfifo previously. Currently it's been removed, good.
> OKI-sans, would you please take a look at ./include/linux/kfifo.h, and try to use this structure and APIs?

As I see it, the code related to that fifo is not used (== dead code)?

> Daniel,
> 
> We're anxious to integrate those codes now. Perhaps it'll take us quite a long time to use kfifo. How about implementing it with the next version?

See above. What do you mean with the next version. The driver posted by
Masayuki is far away from being accepted as it does not yet comply with
the Socket-CAN driver API, to say the least.

Wolfgang.

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