[PATCH v2 2/3] dt-bindings: iio: flow: add Sensirion SLF3S liquid flow sensor

[Wadim Mueller <wafgo01@gmail.com>]

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.

Variants share the same register map and differ only in the flow
scale factor and calibrated measurement range, both of which are
auto-detected at probe time via the product-information register.
Per-variant compatible strings are accepted for documentation and
future-proofing; new variants will fall back on the generic
"sensirion,slf3s" compatible without a driver update.

The data-ready interrupt is optional; without it the driver falls
back to polled I2C reads.

A sensirion,medium property is added so that the driver can start
the sensor with either the H2O or the IPA factory calibration
(default H2O).

Signed-off-by: Wadim Mueller <wafgo01@gmail.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jean Delvare <jdelvare@suse.com>
Cc: Andreas Klinger <ak@it-klinger.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-hwmon@vger.kernel.org
Cc: Maxwell Doose <m32285159@gmail.com>
---
 .../bindings/iio/flow/sensirion,slf3s.yaml    | 68 +++++++++++++++++++
 MAINTAINERS                                   |  8 +++
 2 files changed, 76 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 000000000..f58cf199a
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/flow/sensirion,slf3s.yaml
@@ -0,0 +1,68 @@
+# 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 <wafgo01@gmail.com>
+
+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, both of
+  which are detected at probe time via the product-information register.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - sensirion,slf3s-0600f
+              - sensirion,slf3s-1300f
+              - sensirion,slf3s-4000b
+          - const: sensirion,slf3s
+      - const: sensirion,slf3s
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+    description:
+      Optional data-ready interrupt line.  If omitted the driver falls
+      back to polled I2C reads.
+
+  vdd-supply: true
+
+  sensirion,medium:
+    $ref: /schemas/types.yaml#/definitions/string
+    enum: [ water, ipa ]
+    default: water
+    description:
+      Calibration medium the sensor is configured for at probe time.
+      SLF3S sensors are factory-calibrated for both water and
+      isopropyl alcohol (IPA); this property selects which calibration
+      to activate.  Defaults to water when omitted.
+
+required:
+  - compatible
+  - reg
+  - vdd-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        flow-sensor@8 {
+            compatible = "sensirion,slf3s-0600f", "sensirion,slf3s";
+            reg = <0x08>;
+            vdd-supply = <&reg_3v3>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 06a8c7457..096ef2fe7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -24187,6 +24187,14 @@ 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 <wafgo01@gmail.com>
+R:	Maxwell Doose <m32285159@gmail.com>
+L:	linux-iio@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/iio/flow/sensirion,slf3s.yaml
+F:	drivers/iio/flow/
+
 SENSIRION SPS30 AIR POLLUTION SENSOR DRIVER
 M:	Tomasz Duszynski <tduszyns@gmail.com>
 S:	Maintained
-- 
2.52.0