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

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Message-ID: <D5AB6E638E5A3E4B8F4406B113A5A19A28EA2AB1@shsmsx501.ccr.corp.intel.com>
Date:	Fri, 13 Aug 2010 08:23:42 +0800
From:	"Wang, Qi" <qi.wang@...el.com>
To:	Wolfgang Grandegger <wg@...ndegger.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

> -----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.
> 
> Wolfgang.