Re: [PATCH v6 2/4] dt-bindings: iio: flow: add Sensirion SLF3S liquid flow sensor

On Tue, 28 Jul 2026 23:49:41 +0200
Wadim Mueller <[email protected]> wrote:

> Document the bindings for the Sensirion SLF3S family of digital
> liquid-flow sensors on I2C.  The family currently covers the
> SLF3S-0600F, SLF3S-1300F and SLF3S-4000B variants.

FWIW there is a false positive from Sashiko on this where it says
there is no interrupt pin.  I'll guess that it found a datasheet
talking about one packaging option perhaps?

The first one I checked has the interrupt pin.

Jonathan

> 
> All variants share the same register map and differ only in the flow
> scale factor and the calibrated measurement range, which the driver
> reads back from the product-information register.  Since that lookup
> is needed in any case, a fallback compatible would buy nothing, so
> each variant gets its own compatible without a fallback.  A future
> drop-in compatible part can then claim one of these compatibles and
> work on kernels that do not know its product ID yet.
> 
> The active calibration medium (water / IPA) is runtime-switchable
> via the in_volumeflow_medium sysfs attribute and therefore not a
> DT property.
> 
> Signed-off-by: Wadim Mueller <[email protected]>
> ---
>  .../bindings/iio/flow/sensirion,slf3s.yaml    | 55 +++++++++++++++++++
>  MAINTAINERS                                   |  7 +++
>  2 files changed, 62 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/flow/sensirion,slf3s.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/flow/sensirion,slf3s.yaml b/Documentation/devicetree/bindings/iio/flow/sensirion,slf3s.yaml
> new file mode 100644
> index 000000000000..79718f4f98bd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/flow/sensirion,slf3s.yaml
> @@ -0,0 +1,55 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/flow/sensirion,slf3s.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sensirion SLF3S liquid flow sensor
> +
> +maintainers:
> +  - Wadim Mueller <[email protected]>
> +
> +description:
> +  Family of digital liquid-flow sensors from Sensirion with I2C interface. All
> +  family members share the same register map; sub-types differ only in the flow
> +  scale factor and the calibrated measurement range. The sub-type can be
> +  identified from the product-information register.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - sensirion,slf3s-0600f
> +      - sensirion,slf3s-1300f
> +      - sensirion,slf3s-4000b
> +
> +  reg:
> +    maxItems: 1
> +
> +  vdd-supply: true
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - vdd-supply
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        flow-sensor@8 {
> +            compatible = "sensirion,slf3s-0600f";
> +            reg = <0x08>;
> +            vdd-supply = <&reg_3v3>;
> +            interrupt-parent = <&gpio0>;
> +            interrupts = <0 IRQ_TYPE_EDGE_RISING>;
> +        };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ce020ded5fd3..497492825f70 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -24583,6 +24583,13 @@ S:	Maintained
>  F:	Documentation/ABI/testing/sysfs-bus-iio-chemical-sgp40
>  F:	drivers/iio/chemical/sgp40.c
>  
> +SENSIRION SLF3S LIQUID FLOW SENSOR DRIVER
> +M:	Wadim Mueller <[email protected]>
> +R:	Maxwell Doose <[email protected]>
> +L:	[email protected]
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/iio/flow/sensirion,slf3s.yaml
> +
>  SENSIRION SPS30 AIR POLLUTION SENSOR DRIVER
>  M:	Tomasz Duszynski <[email protected]>
>  S:	Maintained