Re: [PATCH v3 2/5] dt-bindings: iio: magnetometer: QSTCORP QMC5883P

Jonathan Cameron
2026-04-20T13:37:54Z

On Sun, 19 Apr 2026 22:32:32 +0000
Hardik Phalet <hardik.phalet@pm.me> wrote:

> Add the device tree binding document for the QST QMC5883P, a 3-axis
> anisotropic magneto-resistive (AMR) sensor with a 16-bit ADC that
> communicates over I2C.
>
> Add a MAINTAINERS entry for the QSTCORP QMC5883P devicetree binding.
>
> Signed-off-by: Hardik Phalet <hardik.phalet@pm.me>

Google fed me a break out board for this that has a drdy pin?
If so include that as an interrupt as the binding should attempt
to be as complete as possible from the start.

> ---
> .../iio/magnetometer/qstcorp,qmc5883p.yaml | 48 ++++++++++++++++++++++
> MAINTAINERS | 6 +++
> 2 files changed, 54 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/iio/magnetometer/qstcorp,qmc5883p.yaml b/Documentation/devicetree/bindings/iio/magnetometer/qstcorp,qmc5883p.yaml
> new file mode 100644
> index 000000000000..72cc3fef2226
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/magnetometer/qstcorp,qmc5883p.yaml
> @@ -0,0 +1,48 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/magnetometer/qstcorp,qmc5883p.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: QSTCORP QMC5883P 3-axis magnetometer
> +
> +maintainers:
> + - Hardik Phalet <hardik.phalet@pm.me>
> +
> +description:
> + The QMC5883P is a 3-axis anisotropic magneto-resistive (AMR) sensor with a
> + 16-bit ADC. It communicates over I2C (standard and fast modes) and is

If you are spinning again I'd drop the standard and fast modes thing.
It's rare that a device doesn't support those two. High speed mode is another thing
entirely as that changes the protocol quite a bit (I think - it's been a while
since I spec dived on these).

> + targeted at compass, navigation, and industrial applications.
> +
> +properties:
> + compatible:
> + const: qstcorp,qmc5883p
> +
> + reg:
> + maxItems: 1
> + description: I2C address of the device; the default address is 0x2c
> +
> + vdd-supply:
> + description:
> + VDD power supply (2.5 V to 3.6 V). Powers all internal analog and
> + digital functional blocks.
> +
> +required:
> + - compatible
> + - reg
> + - vdd-supply
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + i2c {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + magnetometer@2c {
> + compatible = "qstcorp,qmc5883p";
> + reg = <0x2c>;
> + vdd-supply = <&vdd_3v3>;
> + };
> + };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 48fda1f8332e..d41f6b33d0e5 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -21554,6 +21554,12 @@ F: Documentation/networking/device_drivers/ethernet/freescale/dpaa2/overview.rst
> F: drivers/bus/fsl-mc/
> F: include/uapi/linux/fsl_mc.h
>
> +QSTCORP QMC5883P MAGNETOMETER DRIVER
> +M: Hardik Phalet <hardik.phalet@pm.me>
> +L: linux-iio@vger.kernel.org
> +S: Maintained
> +F: Documentation/devicetree/bindings/iio/magnetometer/qstcorp,qmc5883p.yaml
> +
> QT1010 MEDIA DRIVER
> L: linux-media@vger.kernel.org
> S: Orphan
>