tps65217pmic(4) - NetBSD Manual Pages

TPS65217PMIC(4)         NetBSD Kernel Interfaces Manual        TPS65217PMIC(4)


NAME

     tps65217pmic -- Texas Instruments TPS65217 Power Management IC driver


SYNOPSIS

     tps65217pmic0 at iic? addr 0x24


DESCRIPTION

     The tps65217pmic driver provides minimal support for the TPS65217 chip
     and allows reporting regulated voltages through the envsys(4) API.

     The TPS65217 consists of low-dropout regulators (LDO) and step-down con-
     verters with integrated switching FETs (DCDC):
     ·   LDO1: 1.0V - 3.3V
     ·   LDO2: 0.9V - 3.3V
     ·   LDO3: 1.5V - 3.3V
     ·   LDO4: 1.5V - 3.3V
     ·   DCDC1: 0.9V - 1.8V
     ·   DCDC2: 0.9V - 3.3V
     ·   DCDC1: 0.9V - 1.5V


SEE ALSO

     envsys(4)


HISTORY

     The tps65217pmic device first appeared in NetBSD 7.0.


AUTHORS

     The tps65217pmic driver was written by Radoslaw Kujawa
     <radoslaw.kujawa@gmail.com>.  Voltage change callback for AM335x was
     added by Manuel Bouyer.  White LED (backlight) support was added by
     KIYOHARA Takashi.


CAVEATS

     The driver can only report current voltage regulator settings.  It can
     not measure the real voltage, as the TPS65217 chip lacks hardware to do
     that.  Some boards allow voltage measurement by connecting the power out-
     put to external sensor, or analog input of the MPU, but this is outside
     of the scope of this driver.

     Modifying voltage regulator parameters from user space was deliberately
     left unimplemented, as these parameters should only be set at the
     firmware or kernel level.  Setting wrong parameters may result in perma-
     nent hardware damage.

     The tps65217pmic driver offers a function that can be used to change the
     voltage from other kernel components (currently used by AM335x support
     code).


BUGS

     Battery and interrupt support is not implemented.

NetBSD 9.2                       June 28, 2018                      NetBSD 9.2