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

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Date:	Wed, 11 Aug 2010 19:04:14 -0700
From:	Greg KH <gregkh@...e.de>
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>,
	Wolfgang Grandegger <wg@...ndegger.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>,
	"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 Thu, Aug 12, 2010 at 09:42:27AM +0800, 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.
> > 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?
> 
> 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?

What do you mean by this?  Code isn't merged into the tree unless it is
correct.  Please fix this now, it's not that big of a deal.

> > 3. Can you provide a pointer to Topcliff PCH CAN I/F datasheet ?
> Currently this datasheet isn't open.

Even under NDA?  The Linux foundation offers a service to allow
developers access to data sheets so that they can do kernel development
and code review.

thanks,

greg k-h
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