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Sun, 10 May 2026 12:10:20 -0700 (PDT) Received: from localhost.localdomain ([103.76.103.36]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2baf1c5466bsm81817305ad.0.2026.05.10.12.10.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 10 May 2026 12:10:19 -0700 (PDT) From: Nikhil Gautam To: jic23@kernel.org Cc: dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Nikhil Gautam Subject: [RFC PATCH 0/2] iio: magnetometer: add support for Melexis MLX90393 Date: Mon, 11 May 2026 00:40:08 +0530 Message-Id: <20260510191010.155380-1-nikhilgtr@gmail.com> X-Mailer: git-send-email 2.39.5 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi, This series adds initial Industrial I/O subsystem support for the Melexis MLX90393 3-axis magnetometer and temperature sensor. The MLX90393 supports both I2C and SPI interfaces. This RFC implements support for the I2C interface while keeping the driver structure transport-independent to simplify future SPI support. Currently supported features: raw magnetic field measurements for X/Y/Z axes raw temperature measurements configurable gain/scale selection configurable oversampling ratio direct mode operation through the IIO subsystem initially I2C support for this driver The driver has been tested on Raspberry Pi 5 hardware using an actual MLX90393 sensor connected over I2C. Raw magnetic field and temperature values were verified through the IIO sysfs interface. A custom transport abstraction was used instead of regmap due to the MLX90393 command/response protocol semantics and repeated-start transfer behavior. This approach was discussed previously on the mailing list and seemed preferable for this device. Link: https://lore.kernel.org/linux-iio/20260424114818.1290b029@jic23-huawei/ The implementation intentionally focuses on a minimal and reviewable feature set for the initial RFC submission. Support for SPI, buffered capture, triggers, interrupts and runtime PM can be added incrementally in follow-up work. The DT binding schema has been validated using dt_binding_check and the driver has been checked using checkpatch.pl --strict. Feedback on the overall driver structure, transport abstraction, IIO ABI usage and DT binding would be appreciated. Thanks, Nikhil Gautam Nikhil Gautam (2): dt-bindings: iio: magnetometer: add Melexis MLX90393 iio: magnetometer: add support for Melexis MLX90393 .../iio/magnetometer/melexis,mlx90393.yaml | 39 + drivers/iio/magnetometer/Kconfig | 10 + drivers/iio/magnetometer/Makefile | 2 + drivers/iio/magnetometer/mlx90393.h | 76 ++ drivers/iio/magnetometer/mlx90393_core.c | 724 ++++++++++++++++++ drivers/iio/magnetometer/mlx90393_i2c.c | 71 ++ 6 files changed, 922 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/magnetometer/melexis,mlx90393.yaml create mode 100644 drivers/iio/magnetometer/mlx90393.h create mode 100644 drivers/iio/magnetometer/mlx90393_core.c create mode 100644 drivers/iio/magnetometer/mlx90393_i2c.c -- 2.39.5