[v6,0/3] Add Novatek NT36xxx touchscreen driver

Message

AngeloGioacchino Del Regno Oct. 23, 2020, 4:32 p.m. UTC

From: AngeloGioacchino Del Regno <[e-mail]>

This patch series adds support for the Novatek NT36xxx Series' In-Cell
touchscreen (integrated into the DriverIC).

This patch series has been tested against the following devices:
 - Sony Xperia 10        (SDM630 Ganges Kirin)
 - Sony Xperia 10 Plus   (SDM636 Ganges Mermaid)

Changes in v2:
- Fixed sparse warnings from lkp kernel test robot

Changes in v3 (as requested by Dmitry Torokhov):
- Using shorthand u16/u32 (sorry for the overlook!)
- Now using more input and touchscreen APIs
- Fixed useless workqueue involvements
- Removed useless locking
- Switched reads and writes to use regmap
- Moved header contents to nt36xxx.c
- Fixed reset gpio handling
- Other cleanups
- P.S.: Thanks, Dmitry!

Changes in v4:
- Fixed regmap read length for CRC_ERR_FLAG final check
- Fixed YAML binding, as requested by Krzysztof Kozlowski

Changes in v5:
- Replaced subsystem maintainer's name with .. mine,
  usage of additionalProperties to unevaluatedProperties
  and a typo fix for reset-gpios as per Rob Herring's review
- Changed compatible string as per Krzysztof K. request
- Renamed the novatek,nt36xxx.yaml file to just nt36xxx.yaml
  in order to now reflect the driver name instead of the DT
  compatible
- Fixed blank line at EOF

Changes in v6:
- Removed include of_gpio.h, added mod_devicetable.h and
  gpio/consumer.h
- Added kerneldoc to relevant functions/enum
- Used traditional patterns for error checking where possible
- Documented calls to usleep/msleep
- Using be16_to_cpu / get_unaligned_be16 where possible
- Added helper for CRC error check on retrieved buffer
- Decreased indentation in the CRC reboot recovery function
- Removed instances of error code sum
- Dropped all likely/unlikely optimization as per request
- Removed redundant reset_gpio checks
- Dropped of_match_ptr and ifdefs for CONFIG_OF

AngeloGioacchino Del Regno (3):
  dt-bindings: Add vendor prefix for Novatek Microelectronics Corp.
  Input: Add Novatek NT36xxx touchscreen driver
  dt-bindings: touchscreen: Add binding for Novatek NT36xxx series
    driver

 .../bindings/input/touchscreen/nt36xxx.yaml   |  59 ++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 drivers/input/touchscreen/Kconfig             |  12 +
 drivers/input/touchscreen/Makefile            |   1 +
 drivers/input/touchscreen/nt36xxx.c           | 895 ++++++++++++++++++
 5 files changed, 969 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/nt36xxx.yaml
 create mode 100644 drivers/input/touchscreen/nt36xxx.c