Re: [PATCH RESEND V2 3/4] iio: frequency: adf4350: Add support for clock consumer framework

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On 06/05/2013 10:18 PM, Jonathan Cameron wrote:
> On 06/05/2013 07:07 PM, Lars-Peter Clausen wrote:
>> On 06/05/2013 07:43 PM, Jonathan Cameron wrote:
>>> On 06/05/2013 06:34 PM, Lars-Peter Clausen wrote:
>>>> On 06/05/2013 05:25 PM, Jonathan Cameron wrote:
>>>>> On 05/06/13 15:25, Lars-Peter Clausen wrote:
>>>>>> On 06/05/2013 09:32 AM, Michael Hennerich wrote:
>>>>>>> On 06/04/2013 07:44 PM, Jonathan Cameron wrote:
>>>>>>>> On 06/03/2013 02:30 PM, michael.hennerich@xxxxxxxxxx wrote:
>>>>>>>>> From: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
>>>>>>>>>
>>>>>>>>> Preferably get clkin (PLL reference clock) from clock framework
>>>>>>>>>
>>>>>>>>> Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
>>>>>>>> ERROR: "clk_round_rate" [drivers/iio/frequency/adf4350.ko] undefined!
>>>>>>>> make[1]: *** [__modpost] Error 1
>>>>>>>>
>>>>>>>> on my arm test build. Sorry, I was being lazy before and hadn't done
>>>>>>>> any test builds till I tried merging it.  Backed out the merge of this
>>>>>>>> patch for now.
>>>>>>>>
>>>>>>>> clk.h does say that api is optional for machine classes.  No idea what you
>>>>>>>> want to
>>>>>>>> do about this.
>>>>>>>
>>>>>>> The CLK API is optional in the driver - so I prefer to keep it like that and
>>>>>>> don't make
>>>>>>> the driver depend on COMMON_CLK.
>>>>>>>
>>>>>>> The simplest and probably the best workaround is to guard the CLK Round/Set
>>>>>>> code with
>>>>>>> #if defined(CONFIG_COMMON_CLK).
>>>>>>>
>>>>>>> Thoughts?
>>>>>>>
>>>>>>
>>>>>> This is not a bug in the driver. If the clk API is not implemented it is
>>>>>> stubbed out. It looks as if Jonathan is testing on a platform which
>>>>>> implements the clk API but not clk_round_rate() (None of the other clk_*
>>>>>> symbols are undefined).
>>>>>>
>>>>>> Jonathan on which platform are you testing this?
>>>>> arm specifically pxa27x eabi
>>>>>>
>>>>
>>>> No clk_round_rate() in arch/arm/mach-pxa/clock.c
>>> Hmm.. Indeed.  So what does one do if one wants to use those functions?
>>
>> I think the pxa implementation of the clk API is just broken in this regard.
>> The clk API requires you to implement all the functions declared in
>> include/linux/clk.h
> Not according to the header it doesn't.
> 
> /*
>  * The remaining APIs are optional for machine class support.
>  */
> 
> Just above clk_round_rate
> 
> Odd situation admittedly but the header certainly implies that these do
> not 'need' to be implemented.

It should at least be stubbed out, otherwise this doesn't make too much sense.

- Lars
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