[PATCH v2 0/4] input: touchscreen: add initial support for Goodix Berlin touchscreen IC

[Neil Armstrong]

These touchscreen ICs support SPI, I2C and I3C interface, up to
10 finger touch, stylus and gestures events.

This initial driver is derived from the Goodix goodix_ts_berlin
available at [1] and [2] and only supports the GT9916 IC
present on the Qualcomm SM8550 MTP & QRD touch panel.

The current implementation only supports BerlinD, aka GT9916.

Support for advanced features like:
- Firmware & config update
- Stylus events
- Gestures events
- Previous revisions support (BerlinA or BerlinB)
is not included in current version.

The current support will work with currently flashed firmware
and config, and bail out if firmware or config aren't flashed yet.

[1] https://github.com/goodix/goodix_ts_berlin
[2] https://git.codelinaro.org/clo/la/platform/vendor/opensource/touch-drivers

Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
---
Changes in v2:
- Huge cleanups after Jeff's review:
 - switch to error instead of ret
 - drop dummy vendor/product ids
 - drop unused defined/enums
 - drop unused ic_info and only keep needes values
 - cleanup namings and use goodix_berlin_ everywhere
 - fix regulator setup
 - fix default variables value when assigned afterwars
 - removed indirections
 - dropped debugfs
 - cleaned input_dev setup
 - dropped _remove()
 - sync'ed i2c and spi drivers
- fixed yaml bindings
- Link to v1: https://lore.kernel.org/r/20230606-topic-goodix-berlin-upstream-initial-v1-0-4a0741b8aefd@xxxxxxxxxx

---
Neil Armstrong (4):
      dt-bindings: input: document Goodix Berlin Touchscreen IC
      input: touchscreen: add core support for Goodix Berlin Touchscreen IC
      input: touchscreen: add I2C support for Goodix Berlin Touchscreen IC
      input: touchscreen: add SPI support for Goodix Berlin Touchscreen IC

 .../bindings/input/touchscreen/goodix,gt9916.yaml  |  95 +++
 drivers/input/touchscreen/Kconfig                  |  32 +
 drivers/input/touchscreen/Makefile                 |   3 +
 drivers/input/touchscreen/goodix_berlin.h          | 178 ++++++
 drivers/input/touchscreen/goodix_berlin_core.c     | 681 +++++++++++++++++++++
 drivers/input/touchscreen/goodix_berlin_i2c.c      |  69 +++
 drivers/input/touchscreen/goodix_berlin_spi.c      | 172 ++++++
 7 files changed, 1230 insertions(+)
---
base-commit: 6db29e14f4fb7bce9eb5290288e71b05c2b0d118
change-id: 20230606-topic-goodix-berlin-upstream-initial-ba97e8ec8f4c

Best regards,
-- 
Neil Armstrong <neil.armstrong@xxxxxxxxxx>