[PATCH] kernel - I2C adaptor for ColdFire 5282 CPU

Derek Cheung derek.cheung at sympatico.ca
Thu Apr 14 03:12:53 CEST 2005

OK, hope this patch can satisfy everyone :-)

The following is the diffstat of the enclosed patch file:

 drivers/i2c/busses/Kconfig       |   10 
 drivers/i2c/busses/Makefile      |    1 
 drivers/i2c/busses/i2c-mcf5282.c |  414
 drivers/i2c/busses/i2c-mcf5282.h |   46 ++++
 include/asm-m68knommu/m528xsim.h |   42 +++
 5 files changed, 513 insertions(+)

I did:

a) remove all trailing spaces in the files
b) re-align the switch statement
c) change a return statement
d) change some white space intents to TABs
e) insert a break for the I2C_SMBUS_PROC_CALL, thanks for spotting it
f) fix the mcf5282lite wording in Kconfig

I did not:

g) use the ioremap. This is because Coldfire is a CPU without MMU and
there is no difference between virtual and physical memory. In fact, the
ioremap routine in the m68knommu is simply a stub routine that returns
the input address argument for compatibility reason. Also, all other
Coldfire CPU include files such as the m5307sim.h uses the volatile
declaration method. 
So, I hope this is acceptable to the Linux kernel maintainers

Please let me know if there is any question.


-----Original Message-----
From: Greg KH [mailto:greg at kroah.com] 
Sent: April 11, 2005 4:03 PM
To: Derek Cheung
Cc: 'Randy.Dunlap'; 'Andrew Morton'; Linux-kernel at vger.kernel.org
Subject: Re: [PATCH] kernel - I2C adaptor for ColdFire 5282 CPU

On Sun, Apr 10, 2005 at 12:47:42PM -0400, Derek Cheung wrote:
> Enclosed please find the updated patch that incorporates changes for
> the comments I received.

You did not cc: the sensors mailing list, nor fix all of the coding
style issues.

> The volatile declaration in the m528xsim.h is needed because the
> declaration refers to the ColdFire 5282 register mapping.

Shouldn't you be calling ioremap, and not directly accessing a specific
register location through a pointer?  That's how all other arches do


greg k-h
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