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PMIC connection with Linux

Question asked by Nemanja Savic on Nov 7, 2017
Latest reply on Nov 7, 2017 by igorpadykov

Hi all,

I am using a board with i.MX6Q processor and LTC3676 PMIC. At the moment I would like to realize how is a PMIC actually connected and instantiated in Linux. I looked at the i.MX6 Linux user manual, and there was explained that the on the top sits the regulator core drive, followed by the PF100-core driver and followed by the PF100 regulator driver (although my current sources have only pfuze100-regulator driver).

I see that regulator core driver has very general commands which internally call API of the actual PMIC. I also see that inside the device tree, it is possible to have a PMIC entry with its child regulators.

What I do not understand at the moment is how Linux knows which regulator is used for SoC core voltage, which one provides VDD_ARM, etc. I belive that when scaling the frequency down, the system should know which voltage can be lowered.

Thank you!

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