[PATCH v9 0/2] Add support for Imagis touchscreens

[Markuss Broks]

Add support for Imagis touchscreens, used on various mobile
devices such as Samsung Galaxy J5 (2015), J3 (2015), J5 (2016).

v2: rebase on top of the correct tree
v3:
- prefix all defines as IST3038C
- use two tabs for all defines
- add missing <linux/regulator/consumer.h> header
- drop ADDR_LEN and DATA_LEN defines; use sizeof(reg_be) instead
- use __be32 type for reg_be
- add a comment about i2c read not being successful on first try
- use "ret" instead of "res" in read_reg function
- don't use the internal __cpu_to_be32 function, use cpu_to_be32 instead
- use "error" instead of "ret" in interrupt handler
- pass the slot state directly, without ternary operator
- drop the dev_err in init_input_dev function
- reorder the functions in _probe so that the chipid command is read as fast 
as possible
- don't use imagis_start in probe
- initialize the irq after the chip is powered
- save the return value in imagis_resume
- drop WIDTH_MAJOR since only TOUCH_MAJOR is reported
- the "chip detected" message is now dev_dbg
- reorder headers so they are in alphabetic order
- use GENMASK to generate masks for getting the X and Y coordinates and touch area
- drop *_pressure from device tree bindings since the driver doesn't
support reporting pressure
- fix the typo with i2c address in device treee bindings (48 instead of 50)
- add IRQF_NO_AUTOEN flag to avoid unbalanced irq enable
v4:
- alphabetically order MAINTAINERS entry
- alphabetically order Kconfig and Makefile
- drop the error message in init_regulators
- disable regulators on probe error
- drop IRQF_TRIGGER_FALLING
- @ is not optional (device tree bindings)
- don't use items for compatible
- add maxItems property to reg, drop the comment
v5:
- compatible enum is not an item of the list, drop "-"
v6:
- add _MS suffix to the delay define, drop the comment
- change the reason for retry comment
- add imagis_power_off and imagis_power_on functions to turn regulators
on and off
- use imagis_power_on/off in imagis_start and imagis_stop as well as in probe function
- use error instead of ret in calls to functions which only return 0 or -errno
- include linux/bits.h
- proper indentation in Kconfig
- drop the dev_dbg chip id message
- MODULE_DEVICE_TABLE(of, ...);
- no extra tabs in i2c_driver struct
- save the return value in imagis_suspend
v7:
- initialize ret with 0 in _suspend and _resume (kernel test robot)
- use a separate ret_be variable to avoid casting to __be32 (kernel test robot)
v8:
- use poweroff action
- power_off returns void
- ret -> error
- combine dev declaration and assignment
- use same style for error everywhere
- return devm_regulator_bulk_get() directly
v9:
- don't return in power_off (forgot to commit)

Markuss Broks (2):
  dt-bindings: input/touchscreen: bindings for Imagis
  Input: add Imagis touchscreen driver

 .../input/touchscreen/imagis,ist3038c.yaml    |  74 ++++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 MAINTAINERS                                   |   6 +
 drivers/input/touchscreen/Kconfig             |  10 +
 drivers/input/touchscreen/Makefile            |   1 +
 drivers/input/touchscreen/imagis.c            | 348 ++++++++++++++++++
 6 files changed, 441 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml
 create mode 100644 drivers/input/touchscreen/imagis.c

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2.20.1