linux-kernel - [PATCH v2 8/8] dt-bindings: iio: afe: add binding for temperature-sense-amplifier

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Date:   Mon,  7 Jun 2021 10:47:18 -0400
From:   Liam Beguin <liambeguin@...il.com>
To:     liambeguin@...il.com, peda@...ntia.se, jic23@...nel.org,
        lars@...afoo.de, pmeerw@...erw.net
Cc:     linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org
Subject: [PATCH v2 8/8] dt-bindings: iio: afe: add binding for temperature-sense-amplifier

From: Liam Beguin <lvb@...hos.com>

An ADC is often used to measure other quantities indirectly. This
binding describe such a use case, the measurement of a temperature
through an analog front end connected to a voltage channel.

Signed-off-by: Liam Beguin <lvb@...hos.com>
---
 .../iio/afe/temperature-sense-amplifier.yaml  | 57 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/afe/temperature-sense-amplifier.yaml

diff --git a/Documentation/devicetree/bindings/iio/afe/temperature-sense-amplifier.yaml b/Documentation/devicetree/bindings/iio/afe/temperature-sense-amplifier.yaml
new file mode 100644
index 000000000000..08f97f052a91
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/afe/temperature-sense-amplifier.yaml
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/afe/temperature-sense-amplifier.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Temperature Sense Amplifier
+
+maintainers:
+  - Liam Beguin <lvb@...hos.com>
+
+description: |
+  When an io-channel measures the output voltage of a temperature analog front
+  end such as an RTD (resistance thermometer) or a temperature to current
+  sensor, the interesting measurement is almost always the corresponding
+  temperature, not the voltage output. This binding describes such a circuit.
+
+properties:
+  compatible:
+    const: temperature-sense-amplifier
+
+  io-channels:
+    maxItems: 1
+    description: |
+      Channel node of a voltage io-channel.
+
+  '#io-channel-cells':
+    const: 1
+
+  sense-gain-mult:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Amplifier gain multiplier. The default is <1>.
+
+  sense-gain-div:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Amplifier gain divider. The default is <1>.
+
+  sense-offset-millicelsius:
+    description: Amplifier offset. The default is <0>.
+
+additionalProperties: false
+required:
+  - compatible
+  - io-channels
+
+examples:
+  - |
+    pt1000_1: temperature-sensor {
+        compatible = "temperature-sense-amplifier";
+        #io-channel-cells = <1>;
+        io-channels = <&temp_adc 3>;
+
+        sense-gain-mult = <1000000>;
+        sense-gain-div = <3908>;
+        sense-offset-millicelsius = <(-255885)>;
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index e679d422b472..4f7b4ee9f19b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8887,6 +8887,7 @@ L:	linux-iio@...r.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/iio/afe/current-sense-amplifier.yaml
 F:	Documentation/devicetree/bindings/iio/afe/current-sense-shunt.yaml
+F:	Documentation/devicetree/bindings/iio/afe/temperature-sense-amplifier.yaml
 F:	Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml
 F:	drivers/iio/afe/iio-rescale.c
 
-- 
2.30.1.489.g328c10930387