[PATCH 1/2] dt-bindings: iio: pressure: add honeywell,hsc030

[Petre Rodan <petre.rodan@subdimension.ro>]

Adds binding for digital Honeywell TruStability HSC and SSC series
pressure and temperature sensors.

Datasheet:
 [HSC] https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-hsc-series/documents/sps-siot-trustability-hsc-series-high-accuracy-board-mount-pressure-sensors-50099148-a-en-ciid-151133.pdf
 [SSC] https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-ssc-series/documents/sps-siot-trustability-ssc-series-standard-accuracy-board-mount-pressure-sensors-50099533-a-en-ciid-151134.pdf

Signed-off-by: Petre Rodan <petre.rodan@subdimension.ro>
---
 .../iio/pressure/honeywell,hsc030pa.yaml     | 166 ++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/pressure/honeywell,hsc0030pa.yaml

diff --git a/Documentation/devicetree/bindings/iio/pressure/honeywell,hsc030pa.yaml b/Documentation/devicetree/bindings/iio/pressure/honeywell,hsc030pa.yaml
new file mode 100644
index 000000000000..777710790696
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/pressure/honeywell,hsc030pa.yaml
@@ -0,0 +1,166 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/pressure/honeywell,hsc030pa.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Honeywell TruStability HSC and SSC pressure sensor families
+
+maintainers:
+  - Petre Rodan <petre.rodan@subdimension.ro>
+
+description: |
+  support for Honeywell TruStability HSC and SSC digital pressure sensor
+  families.
+
+  These sensors have either an I2C, an SPI or an analog interface. Only the
+  digital versions are supported by this driver.
+
+  There are 118 models with different pressure ranges available in each family.
+  The vendor calls them "HSC series" and "SSC series". All of them have an
+  identical programming model but differ in pressure range, unit and transfer
+  function.
+
+  To support different models one need to specify the pressure range as well as
+  the transfer function. Pressure range can either be provided via range_str or
+  in case it's a custom chip via numerical range limits converted to pascals.
+
+  The transfer function defines the ranges of raw conversion values delivered
+  by the sensor. pmin-pascal and pmax-pascal corespond to the minimum and
+  maximum pressure that can be measured.
+
+  Specifications about the devices can be found at:
+  https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-hsc-series/documents/sps-siot-trustability-hsc-series-high-accuracy-board-mount-pressure-sensors-50099148-a-en-ciid-151133.pdf
+  https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-ssc-series/documents/sps-siot-trustability-ssc-series-standard-accuracy-board-mount-pressure-sensors-50099533-a-en-ciid-151134.pdf
+
+properties:
+  compatible:
+    enum:
+      - honeywell,hsc
+      - honeywell,ssc
+
+  reg:
+    maxItems: 1
+
+  honeywell,transfer-function:
+    description: |
+      Transfer function which defines the range of valid values delivered by
+      the sensor.
+      0 - A, 10% to 90% of 2^14
+      1 - B, 5% to 95% of 2^14
+      2 - C, 5% to 85% of 2^14
+      3 - F, 4% to 94% of 2^14
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  honeywell,range_str:
+    description: |
+      Five character string that defines "pressure range, unit and type"
+      as part of the device nomenclature. In the unlikely case of a custom
+      chip, set to "NA" and provide honeywell,pmin-pascal honeywell,pmax-pascal
+    enum: [ "001BA", "1.6BA", "2.5BA", "004BA", "006BA", "010BA", "1.6MD",
+            "2.5MD", "004MD", "006MD", "010MD", "016MD", "025MD", "040MD",
+            "060MD", "100MD", "160MD", "250MD", "400MD", "600MD", "001BD",
+            "1.6BD", "2.5BD", "004BD", "2.5MG", "004MG", "006MG", "010MG",
+            "016MG", "025MG", "040MG", "060MG", "100MG", "160MG", "250MG",
+            "400MG", "600MG", "001BG", "1.6BG", "2.5BG", "004BG", "006BG",
+            "010BG", "100KA", "160KA", "250KA", "400KA", "600KA", "001GA",
+            "160LD", "250LD", "400LD", "600LD", "001KD", "1.6KD", "2.5KD",
+            "004KD", "006KD", "010KD", "016KD", "025KD", "040KD", "060KD",
+            "100KD", "160KD", "250KD", "400KD", "250LG", "400LG", "600LG",
+            "001KG", "1.6KG", "2.5KG", "004KG", "006KG", "010KG", "016KG",
+            "025KG", "040KG", "060KG", "100KG", "160KG", "250KG", "400KG",
+            "600KG", "001GG", "015PA", "030PA", "060PA", "100PA", "150PA",
+            "0.5ND", "001ND", "002ND", "004ND", "005ND", "010ND", "020ND",
+            "030ND", "001PD", "005PD", "015PD", "030PD", "060PD", "001NG",
+            "002NG", "004NG", "005NG", "010NG", "020NG", "030NG", "001PG",
+            "005PG", "015PG", "030PG", "060PG", "100PG", "150PG", "NA" ]
+    $ref: /schemas/types.yaml#/definitions/string
+
+  honeywell,pmin-pascal:
+    description: |
+      Minimum pressure value the sensor can measure in pascal.
+      To be specified only if honeywell,range_str is set to "NA".
+    $ref: /schemas/types.yaml#/definitions/int32
+
+  honeywell,pmax-pascal:
+    description: |
+      Maximum pressure value the sensor can measure in pascal.
+      To be specified only if honeywell,range_str is set to "NA".
+    $ref: /schemas/types.yaml#/definitions/int32
+
+  vdd-supply:
+    description: |
+      Provide VDD power to the sensor (either 3.3V or 5V depending on the chip).
+      Optional, activate only if required by the target board.
+
+  spi-max-frequency:
+    description: SPI clock to be kept between 50 and 800kHz
+
+  clock-frequency:
+    description: i2c clock to be kept between 100 and 400kHz
+
+required:
+  - compatible
+  - reg
+  - honeywell,transfer-function
+  - honeywell,range_str
+  - clock-frequency
+  - spi-max-frequency
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    i2c {
+        status = "okay";
+        clock-frequency = <400000>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        HSCMRNN030PA2A3@28 {
+          status = "okay";
+          compatible = "honeywell,hsc";
+          reg = <0x28>;
+          honeywell,transfer-function = <0>;
+          honeywell,range_str = "030PA";
+          honeywell,pmin-pascal = <0>;
+          honeywell,pmax-pascal = <206850>;
+
+		      //vdd-supply = <&foo>;
+        };
+    };
+
+    spi {
+        # note that MOSI is not required by this sensor
+        status = "okay";
+        #address-cells = <1>;
+        #size-cells = <0>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&spi0_pins>;
+
+        channel@0{
+          status = "disabled";
+          reg = <0>;
+        };
+
+        HSCMLNN100PASA3@0 {
+          status = "okay";
+          compatible = "honeywell,hsc";
+		      reg = <0>;
+		      spi-max-frequency = <800000>;
+
+		      honeywell,transfer-function = <0>;
+		      honeywell,range_str = "100PA";
+
+		      // in case of a custom range, use NA as range_str
+		      // and populate pmin-pascal and pmax-pascal
+		      // with the range limits converted into pascals
+		      //honeywell,range_str = "NA";
+		      //honeywell,pmin-pascal = <0>;
+		      //honeywell,pmax-pascal = <206850>;
+
+		      //vdd-supply = <&foo>;
+	      };
+    };
+
-- 
2.41.0