Re: cpufreq-dt error: failed to init cpufreq table: -61

[Felipe Balbi <balbi@ti.com>]

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Belisko Marek <marek.belisko@gmail.com> writes:

> Hi,
>
> On Tue, Oct 6, 2015 at 4:03 PM, Belisko Marek <marek.belisko@gmail.com> wrote:
>> Hi Felipe,
>>
>> On Tue, Oct 6, 2015 at 4:00 PM, Felipe Balbi <balbi@ti.com> wrote:
>>>
>>> Hi,
>>>
>>> Belisko Marek <marek.belisko@gmail.com> 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 ?
Seems like you won't be able to do anything more than enable/disable a
voltage rail.

-- 
balbi

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