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

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Message-ID: <4C65255F.4010709@grandegger.com>
Date:	Fri, 13 Aug 2010 12:58:39 +0200
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	"Wang, Qi" <qi.wang@...el.com>
CC:	"Khor, Andrew Chih Howe" <andrew.chih.howe.khor@...el.com>,
	"socketcan-core@...ts.berlios.de" <socketcan-core@...ts.berlios.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"Wang, Yong Y" <yong.y.wang@...el.com>,
	Masayuki Ohtak <masa-korg@....okisemi.com>,
	"meego-dev@...go.com" <meego-dev@...go.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>
Subject: Re: [MeeGo-Dev][PATCH] Topcliff: Update PCH_CAN driver to 2.6.35

On 08/13/2010 02:23 AM, Wang, Qi wrote:
>> -----Original Message-----
>> From: Wolfgang Grandegger [mailto:wg@...ndegger.com]
>> Sent: Thursday, August 12, 2010 5:04 PM
>> To: Wang, Qi
>> Cc: Daniel Baluta; Masayuki Ohtak; meego-dev@...go.com;
>> socketcan-core@...ts.berlios.de; netdev@...r.kernel.org; Khor, Andrew Chih
>> Howe; gregkh@...e.de; arjan@...ux.intel.com; Wang, Yong Y
>> 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?
> The Topcliff IOH is developed by OKI actually.
> 
>>
>>>> 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)?
> I'm not familiar with kfifo structure, and I didn't like it because there need a spin_lock to use it.
>>
>>> 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.
> I've few experience on CAN driver and it's also the first time for OKI-san to write Can driver. Would you please give us a reference and we'll follow it up. We only read 'can.txt' from kernel document. Thank you for your help in advance.

You are welcome. I think I/we already gave useful hints on what is
missing and what examples to follow.

Wolfgang.
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