topic Enable PU regulator in i.MX Processors

Enable PU regulator

niklasmolin — Sat, 31 Dec 2016 19:58:40 GMT

Hi.

I wonder if there is a quick way to enable the PU regulator, either in the device tree or from user space?

For the moment it seems like the PU regulator is disabled (during the startup I can see it first enables and then disables it).

Since it's disabled, the VDDPU won't follow the VDDSOC (which it should according to the datasheet), when changing the frequency (in the imx6q-cpufreq.c file).

If I don't have an application using the VPU, will it automatically disabled the VDDPU?

Thanks,

Niklas

Re: Enable PU regulator

igorpadykov — Tue, 03 Jan 2017 04:31:24 GMT

Hi Niklas

one can check "reg_pu" in imx6qdl.dtsi :

linux-2.6-imx.git - Freescale i.MX Linux Tree

If application is not using the VPU, linux will automatically disable the VDDPU.

Requirement that VDDPU should follow the VDDSOC applies when VDDPU is enabled.

Best regards
igor
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Re: Enable PU regulator

niklasmolin — Tue, 03 Jan 2017 18:02:23 GMT

Hi Igor.

Thanks for the answer.

I assume that was the case.

Thanks,

Niklas