The Raspberry Pi 3B+ contains the MaxLinear (previously Exar) MxL7704 power management chip (PMIC) with I2C interface for "on-line" reconfiguration of power sequencing and internal voltages.1 This is the first time a Raspberry Pi contains a software programmable power management chip. Which driver configures power management with this chip ?

  • Grepping through the latest Pi kernel (4.16.0) .c, .h, and Kconfig files for "7704", "Exar", and "MaxLinear" doesn't show anything appropriate. I guess there could be a generic interface but that seems unlikely.
    – goldilocks
    Commented Mar 15, 2018 at 14:12

1 Answer 1


The PMIC of the Raspberry PI 3B+ is not controlled by Linux, but the closed-source firmware1.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.