• Hans de Goede's avatar
    regulator: axp20x: Add support for the (external) drivebus regulator · 636e2a39
    Hans de Goede authored
    The axp20x pmics have 2 power inputs, one called ACIN which is intended
    for to be supplied via a powerbarrel on the board and one called VBUS
    which is intended to be supplied via an otg connector.
    
    In the VBUS case the pmic needs to know if the board is supplying power
    to the otg connector, because then it should not take any power from
    its VBUS pin. The axp209 pmic has a N_VBUSEN input pin via which the
    board can signal to the pmic whether the board is supplying power to the
    otg connector or not.
    
    On the axp221/axp223 this pin can alternatively be used as an output
    which controls an external regulator which (optionally) supplies
    power to the otg connector from the board. When the pin is used as
    output it is called DRIVEVBUS in the datasheet.
    
    This commit adds support for the DRIVEVBUS pin as an extra pmic
    controlled regulator. Since this is optional a new x-powers,drivebus dt
    property is added. When this is present the misc-control register is
    written to change the N_VBUSEN input pin to DRIVEVBUS output pin mode and
    the extra drivebus regulator is registered with the regulator subsystem.
    Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
    Acked-by: default avatarChen-Yu Tsai <wens@csie.org>
    Signed-off-by: default avatarMark Brown <broonie@kernel.org>
    636e2a39
axp20x.txt 5.26 KB