[PATCH v4 0/2] iio: magnetometer: add support for Infineon TLV493D 3D Magnetic Sensor

[Dixit Parmar <dixitparmar19@gmail.com>]

The Infineon TLV493D is a Low-Power 3D Magnetic Sensor. The Sensor
applications includes joysticks, control elements (white goods,
multifunction knops), or electric meters (anti tampering) and any
other application that requires accurate angular measurements at
low power consumptions.

The Sensor is configured over I2C, and as part of Sensor measurement
data it provides 3-Axis magnetic fields and temperature core measurement.

The driver supports raw value read and buffered input via external trigger
to allow streaming values with the same sensing timestamp.

While the sensor has an interrupt pin multiplexed with an I2C SCL pin.
But for bus configurations interrupt(INT) is not recommended, unless timing
constraints between I2C data transfers and interrupt pulses are monitored
and aligned.

The Sensor's I2C register map and mode information is described in product
User Manual [1].

Datasheet: https://www.infineon.com/assets/row/public/documents/24/49/infineon-tlv493d-a1b6-datasheet-en.pdf
Link: https://www.mouser.com/pdfDocs/Infineon-TLV493D-A1B6_3DMagnetic-UserManual-v01_03-EN.pdf [1]
Signed-off-by: Dixit Parmar <dixitparmar19@gmail.com>
---
Changes in v4:
- Include required headers.
- Drop struct device *dev from the sensor data structure and use
  i2c_client *client to derive it wherever needed.
- Use FIELD_MODIFY instead of FIELD_PREP to keep other bits intacts.
- Remove unused defines TLV493D_WR_REG_RES*.
- Drop the pm_runtime_mark_last_busy(). As now always called in the
  pm_runtime_put_autosuspend().
- Change goto labels to make it more descriptive.
- Fix style & typo errors.
- Link to v3: https://lore.kernel.org/r/20250807-tlv493d-sensor-v6_16-rc5-v3-0-b80d2cb41232@gmail.com

Changes in v3:
- dt-binding: rename to infineon,tlv493d-a1b6.yaml.
- dt-binding: fix convention errors.
- Switch to using enums for mode and channel where applicable.
- Drop unnecesary input argument checks in functions.
- Switch to u32 array for mode sample rate timing from single member struct.
- Add note describing the I2C communication characteristics at the top.
- Drop tlv493d_setup_ops and use NULL directly.
- Fix typos in comments and commit messages.
- Link to v2: https://lore.kernel.org/r/20250802-tlv493d-sensor-v6_16-rc5-v2-0-e867df86ad93@gmail.com

Changes in v2:
- Drop regmap implementation in favor of using direct i2c APIs to
  have uniform communication APIs across the driver.
- Remove custom device-tree properties as suggested and hardcode
  setting operating mode in probe().
- Derive and hardcode temperature offset from raw offset and compensation.
- Add missing device name(tlv493_) prefix in global variables.
- Change float operation with multiplier to fixed value(1100).
- Change Magnetic field reporting to Guass SI unit.
- User FIELD_PREP instead of direct bitwise ops.
- Convert sensor channel parsing logic from Macro to function for
  better readability.
- Discard unused #define's.
- Discard IIO_CHAN_INFO_PROCESSED.
- Maintain alphabetical order of config options in Makefile and Kconfig.
- Readability fixes.
- Link to v1: https://lore.kernel.org/r/20250726-tlv493d-sensor-v6_16-rc5-v1-0-deac027e6f32@gmail.com

---
Dixit Parmar (2):
      iio: magnetometer: add support for Infineon TLV493D 3D Magentic sensor
      dt-bindings: iio: magnetometer: document Infineon TLV493D 3D Magnetic sensor

 .../iio/magnetometer/infineon,tlv493d-a1b6.yaml    |  45 ++
 .../devicetree/bindings/trivial-devices.yaml       |   2 -
 drivers/iio/magnetometer/Kconfig                   |  13 +
 drivers/iio/magnetometer/Makefile                  |   2 +
 drivers/iio/magnetometer/tlv493d.c                 | 530 +++++++++++++++++++++
 5 files changed, 590 insertions(+), 2 deletions(-)
---
base-commit: d7b8f8e20813f0179d8ef519541a3527e7661d3a
change-id: 20250726-tlv493d-sensor-v6_16-rc5-18c712093b27

Best regards,
-- 
Dixit Parmar <dixitparmar19@gmail.com>