[v3,0/3] mainline ti tsc2046 adc driver

Message

Oleksij Rempel March 19, 2021, 2:45 p.m. UTC

changes v3:
- different spell fixes
- add some notes about driver structure
- rename the trigger to point on the touchscreen nature of it
- rename DT binding to oversampling-ratio
- make sure we have some defaults in case no DT property is set

changes v2:
- rework and extend DT binding properties
- remove touchscreen related code from the IIO ADC driver
- make trigger be active longer then IRQ is requesting. This is needed
  to get "inactive" samples
- make oversampling and settle time configurable

TI TSC2046 is a touchscreen controller based on 8 channel ADC. Since most of
this ADC based touchscreen controller share same set of challenges, it
is better keep then as simple IIO ADC devices attached to a generic
resistive-adc-touch driver.

This driver can replace drivers/input/touchscreen/ads7846.c and has
following advantages over it:
- less code to maintain
- shared code paths (resistive-adc-touch, iio-hwmon, etc)
- can be used as plain IIO ADC to investigate signaling issues or test
  real capacity of the plates and attached low-pass filters
  (or use the touchscreen as a microphone if you like ;) )

Oleksij Rempel (3):
  dt-bindings:iio:adc: add generic settling-time-us and
    oversampling-ratio channel properties
  dt-bindings:iio:adc: add documentation for TI TSC2046 controller
  iio: adc: add ADC driver for the TI TSC2046 controller

 .../devicetree/bindings/iio/adc/adc.yaml      |   9 +
 .../bindings/iio/adc/ti,tsc2046.yaml          | 115 +++
 MAINTAINERS                                   |   8 +
 drivers/iio/adc/Kconfig                       |  12 +
 drivers/iio/adc/Makefile                      |   1 +
 drivers/iio/adc/ti-tsc2046.c                  | 728 ++++++++++++++++++
 6 files changed, 873 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,tsc2046.yaml
 create mode 100644 drivers/iio/adc/ti-tsc2046.c