Grant Likely wrote:
> On Wed, Apr 1, 2009 at 1:51 AM, Wolfgang Grandegger <w...@grandegger.com>
> wrote:
>> Grant Likely wrote:
>>> The table definition is more verbose this way, but I think it results
>>> in more understandable and easier to extend code. It also adds lets
>>> the compiler do more type checking for you.
>> OK but I don't like the callback function to do the settings. We need
>> backward compatibility with old DTS files including the ugly "dfsrr"
>> property, right? Then it seems consequent to continue using i2c->flags
>> for that purpose and not to introduce another method. If we don't need
>> backward compatibility, we could drop the flags completely and just use
>> callback functions.
>
> I don't understand why you don't like it. It's an elegant solution
> and it simplifies the code somewhat. After grabbing the callback
> pointer the compatibility code can simply override it. But I won't
> belabor the point or oppose the patch if you stick with the flags
> pointer.
I changed my mind ;-). Have a look to PATCH v2 I sent out a few minutes ago.
>>>> --- linux-2.6.orig/arch/powerpc/platforms/52xx/mpc52xx_common.c 2009-03-31
>>>> 13:25:08.000000000 +0200
>>>> +++ linux-2.6/arch/powerpc/platforms/52xx/mpc52xx_common.c 2009-03-31
>>>> 13:28:54.309718526 +0200
>>>> +int fsl_i2c_get_fdr(struct device_node *node, u32 i2c_clock, u32
>>>> i2c_flags)
>>>> +{
>>>> [...]
>>>> +}
>>>> +EXPORT_SYMBOL(fsl_i2c_get_fdr);
>>> does not work on a multiplatform kernel. Both 8xxx and 52xx support
>>> can be selected at the same time.
>> OK, then we need different functions including stubs.
>
> I've been thinking about this more. These tables are only ever going
> to be used by the i2c_mpc driver and so really they are a part of the
> i2c_mpc driver itself. Putting them into common code doesn't make any
> sense because it is not common code. I will not merge a patch that
> puts them into mpc5200 common code.
It's not common code, I agree. How about putting it into mpc52xx_i2c.c
and use:
$ cat Makefile
obj-$(CONFIG_I2C_MPC) += mpc52xx_i2c.o
Or it could be moved back to the i2c_mpc driver and we add stubs for the
functions to get the bus frequency, or use #ifdef's.
Wolfgang.
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