Felipe Balbi <balbi@xxxxxx> writes:
> Belisko Marek <marek.belisko@xxxxxxxxx> writes:
>
>> Hi,
>>
>> On Tue, Oct 6, 2015 at 4:03 PM, Belisko Marek <marek.belisko@xxxxxxxxx> wrote:
>>> Hi Felipe,
>>>
>>> On Tue, Oct 6, 2015 at 4:00 PM, Felipe Balbi <balbi@xxxxxx> wrote:
>>>>
>>>> Hi,
>>>>
>>>> Belisko Marek <marek.belisko@xxxxxxxxx> writes:
>>>>> Hi Tony,
>>>>>
>>>>> I'm using custom am33xx board where mpu voltage can be changed through
>>>>> gpio regulator on 4.1 (latest stable) kernel. I defined gpio-regulator
>>>>> node and also operating-points to DT. Gpio regulator seems to be
>>>>> working fine but during probing cpufreq-dt I get error:
>>>>> failed to init cpufreq table: -61
>>>>>
>>>>> I did small investigation and seem that dev_pm_opp_init_cpufreq_table
>>>>> fails at first condition dev_pm_opp_get_opp_count <= 0 and this is
>>>>> because opp_list is empty. So it seems that any opp for am33xx aren't
>>>>> defined if I'm getting it right. I did look to mach-omap2/opp3xxx_data
>>>>> but there is nothing am33xx specific. It is known problem or exist
>>>>> some patches around to fix that? Many thanks.
>>>>
>>>> OPP initialization is not in mainline yet, there are some out-of-tree
>>>> patches which TI has been working on. If you want to use them, have a
>>>> look at TI's vendor kernel at [1]
>>> Thanks for link. One thing which is still not puzzled before I use 3.9
>>> kernel and it was working fine
>>> it's stops working when bumped to 4.1.
>>
>> Sorry information was incorrect. On 3.9 kernel we did use tps, pmic
>> now we have only gpio regulator so this is the difference.
>
> okay, if it's only a regulator how can you set different voltages ?
^^^^^^^^^
GPIO, rather
> Seems like you won't be able to do anything more than enable/disable a
> voltage rail.
>
> --
> balbi
--
balbi
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