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 ? Seems like you won't be able to do anything more than enable/disable a voltage rail. -- balbi
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