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

[Felipe Balbi <balbi@ti.com>]

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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]

[1] http://git.ti.com/ti-linux-kernel/ti-linux-kernel/blobs/ti-lsk-linux-4.1.y/arch/arm/mach-omap2/opp33xx_data.c

-- 
balbi

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