[v6,0/3] Add a property to turn off the max touch controller if not used

Message

Stefan Eichenberger July 15, 2024, 3:31 p.m. UTC

Our hardware has a shared regulator that powers various peripherals such
as the display, touch, USB hub, etc. Since the Maxtouch controller
doesn't currently allow it to be turned off, this regulator has to stay
on when not used. This increases the overall power consumption. In order
to turn off the controller when the system does not use it, this series
adds a device tree property to the Maxtouch driver that allows the
controller to be turned off completely and ensures that it can resume
from the power off state.

Changes since v5:

- Keep reset pin untouched in mxt_power_off (Dmitry)
- Generate proper reset signal in mxt_power_on (Dmitry)
- Drop introduction of mxt_device_register (not necessary)

Changes since v4:

- Load configuration firmware during probe and not after resume (Dmitry)
- Do some improvements on error handling (Dmitry)
- Add Reviewed-by tag from Joao

Changes since v3:

- Move the power on part to mxt_start and the power off part to
  mxt_stop. This allows to turn the touch controller off even when not
  in use and not only when being suspended (Dmitry)

Changes since v2:

- Add Reviewed-by tags from Linus and Krzysztof to the dt-bindings patch

Changes since v1:

- Rename the property and change the description (Krzysztof, Linus,
  Dmitry, Conor)

Stefan Eichenberger (3):
  Input: atmel_mxt_ts - add power off and power on functions
  dt-bindings: input: atmel,maxtouch: add poweroff-sleep property
  Input: atmel_mxt_ts - add support for poweroff-sleep

 .../bindings/input/atmel,maxtouch.yaml        |   6 +
 drivers/input/touchscreen/atmel_mxt_ts.c      | 134 +++++++++++++-----
 2 files changed, 108 insertions(+), 32 deletions(-)