[PATCH 1/3] ARM: imx: Add common imx cpuidle init functionality.

[Rob Lee]

On Tue, Apr 17, 2012 at 9:13 AM, Christian Robottom Reis
<kiko at linaro.org> wrote:
> On Tue, Apr 17, 2012 at 08:54:03AM -0500, Rob Lee wrote:
>> >> +void __init imx_cpuidle_set_driver(struct cpuidle_driver *p)
>> >> +{
>> >> +     drv = p;
>> >> +}
>> >
>> > You like it complicated, eh? Why do you introduce a function which sets
>> > a variable...
>>
>> This complication is used to deal with the timing of various levels of
>> init calls.  More explanation below.
>
> Regardless of how you end up solving this, it's probably a good idea
> to document the rationale, perhaps cribbing from what you describe
> below..

Agree.  Adding comments to the function itself seems to be the most
relevant location so I can add that information there if the function
remains.

>
>> If I called imx_cpuidle_init directly from imx5 or imx6q init
>> routines, it would be getting called before the coreinit_call of core
>> cpuidle causing a failure.  There were various other directions to
>> take and all seemed less desirable than this one.
>>
>> One alternative would be to add a function to return the pointer to
>> the cpuidle driver object based on the machine type.  Functionality
>> exists to identify imx5 as a machine type but not imx6q, so I couldn't
>> use that machine based method without adding that extra code.
>>
>> Another alternative would be to add a general platform lateinit_call
>> function to each platforms that support cpuidle.
>
> ..in a comment; without it, the code indeed looks bizarre.
> --
> Christian Robottom Reis, Engineering VP
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