dt-bindings:iio:potentiostat:ti,lmp91000: txt to yaml conversion.

There were a few parts of the example that did not conform to the
binding description and would not have worked with the Linux driver
as a result.  Fixed them whilst doing this conversion.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
Cc: Matt Ranostay <matt.ranostay@konsulko.com>
Link: https://lore.kernel.org/r/20201031181242.742301-11-jic23@kernel.org

Documentation/devicetree/bindings/iio/potentiostat/lmp91000.txt

-* Texas Instruments LMP91000 series of potentiostats
-
-LMP91000: https://www.ti.com/lit/ds/symlink/lmp91000.pdf
-LMP91002: https://www.ti.com/lit/ds/symlink/lmp91002.pdf
-
-Required properties:
-
-  - compatible: should be one of the following:
-                 "ti,lmp91000"
-                 "ti,lmp91002"
-  - reg: the I2C address of the device
-  - io-channels: the phandle of the iio provider
-
-  - ti,external-tia-resistor: if the property ti,tia-gain-ohm is not defined this
-    needs to be set to signal that an external resistor value is being used.
-
-Optional properties:
-
-  - ti,tia-gain-ohm: ohm value of the internal resistor for the transimpedance
-    amplifier. Must be 2750, 3500, 7000, 14000, 35000, 120000, or 350000 ohms.
-
-  - ti,rload-ohm: ohm value of the internal resistor load applied to the gas
-    sensor. Must be 10, 33, 50, or 100 (default) ohms.
-
-Example:
-
-lmp91000@48 {
-	compatible = "ti,lmp91000";
-	reg = <0x48>;
-	ti,tia-gain-ohm = <7500>;
-	ti,rload = <100>;
-	io-channels = <&adc>;
-};

Documentation/devicetree/bindings/iio/potentiostat/ti,lmp91000.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/potentiostat/ti,lmp91000.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments LMP91000 series of potentiostats with I2C control
+
+maintainers:
+  - Matt Ranostay <matt.ranostay@konsulko.com>
+
+description: |
+  Typically used as a signal conditioner for chemical sensors.
+  LMP91000: https://www.ti.com/lit/ds/symlink/lmp91000.pdf
+  LMP91002: https://www.ti.com/lit/ds/symlink/lmp91002.pdf
+
+properties:
+  compatible:
+    enum:
+      - ti,lmp91000
+      - ti,lmp91002
+
+  reg:
+    maxItems: 1
+
+  io-channels:
+    maxItems: 1
+
+  ti,external-tia-resistor:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      If the property ti,tia-gain-ohm is not defined this needs to be set to
+      signal that an external resistor value is being used.
+
+  ti,tia-gain-ohm:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [2750, 3500, 7000, 14000, 35000, 120000, 350000]
+    description:
+      Internal resistor for the transimpedance amplifier.
+
+  ti,rload-ohm:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [10, 33, 50, 100]
+    description:
+      Internal resistor load applied to the gas sensor.
+      Default 100 Ohms.
+
+required:
+  - compatible
+  - reg
+  - io-channels
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        lmp91000@48 {
+            compatible = "ti,lmp91000";
+            reg = <0x48>;
+            ti,tia-gain-ohm = <7000>;
+            ti,rload-ohm = <100>;
+            io-channels = <&adc>;
+        };
+    };
+...