[v7,0/3] Add Novatek NT36xxx touchscreen driver

From: AngeloGioacchino Del Regno <kholk11@gmail.com>

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

Changes in v7:
- Fixed typo in nt36xxx.c

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

On Sat, Oct 24, 2020 at 12:51:11PM +0200, kholk11@gmail.com wrote:
> From: AngeloGioacchino Del Regno <kholk11@gmail.com>
> 
> Add binding for the Novatek NT36xxx series touchscreen driver.
> 
> Signed-off-by: AngeloGioacchino Del Regno <kholk11@gmail.com>
> ---
>  .../bindings/input/touchscreen/nt36xxx.yaml   | 59 +++++++++++++++++++
>  1 file changed, 59 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/nt36xxx.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/nt36xxx.yaml b/Documentation/devicetree/bindings/input/touchscreen/nt36xxx.yaml
> new file mode 100644
> index 000000000000..1486b20d6c49
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/nt36xxx.yaml
> @@ -0,0 +1,59 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/touchscreen/nt36xxx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Novatek NT36xxx series touchscreen controller Bindings
> +
> +maintainers:
> +  - AngeloGioacchino Del Regno <kholk11@gmail.com>
> +
> +allOf:
> +  - $ref: touchscreen.yaml#
> +
> +properties:
> +  compatible:
> +    const: novatek,nt36525
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +  vdd-supply:
> +    description: Power supply regulator for VDD pin
> +
> +  vio-supply:
> +    description: Power supply regulator on VDD-IO pin
> +
> +unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    i2c {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      touchscreen@62 {
> +        compatible = "novatek,nt36525";
> +        reg = <0x62>;
> +        interrupt-parent = <&tlmm>;
> +        interrupts = <45 IRQ_TYPE_EDGE_RISING>;
> +        reset-gpio = <&tlmm 102 GPIO_ACTIVE_HIGH>;

The same as for v5 - reset-gpios.

Best regards,
Krzysztof