[PATCH v2 0/5] iio: magnetometer: Add QMC5883L driver support

[Brajesh Patil]

This series introduces support for the QST QMC5883L 3-axis magnetometer,
a magnetic sensor with I2C interface.

The implementation follows standard IIO conventions and includes:

Patch 1/5: dt-bindings: vendor-prefixes
- Adds 'qst' prefix for QST Corporation

Patch 2/5: dt-bindings: iio: magnetometer - Adds QMC5883L bindings
- Adds compatible string and required properties
- Includes example device tree node

Patch 3/5: iio: magnetometer - Base driver implementation
- Basic register access via regmap
- X/Y/Z axis and temperature readings
- Triggered buffer support
- Initialization and core functionality

Patch 4/5: Extended sysfs attributes and configuration
- ODR (10-200Hz) and FSR (±2G/±8G) control
- Mode selection (standby/continuous)
- Oversampling ratio configuration (512-64)
- Status monitoring (DRDY/OVL flags)
- Available scale and sampling frequency attributes

Patch 5/5: Advanced features and power management
- Mount matrix support for orientation compensation
- Power management (suspend/resume)
- Control register features (soft reset, pointer rollover)

The driver has been tested on a Raspberry Pi 5 and all features have been verified.

Signed-off-by: Brajesh Patil <brajeshpatil11@xxxxxxxxx>