[PATCH v1 9/9] dt-bindings: iio: afe: add binding for temperature-sense-amplifier

From: Liam Beguin
Date: Sat May 29 2021 - 21:00:02 EST


From: Liam Beguin <lvb@xxxxxxxxxx>

An ADC is often used to measure other quantities indirectly. This
binding describe one cases, the measurement of a temperature through a
voltage sense amplifier such as the LTC2997.

Signed-off-by: Liam Beguin <lvb@xxxxxxxxxx>
---
.../iio/afe/temperature-sense-amplifier.yaml | 55 +++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 56 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..015413cbffbc
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/afe/temperature-sense-amplifier.yaml
@@ -0,0 +1,55 @@
+# 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@xxxxxxxxxx>
+
+description: |
+ When an io-channel measures the output voltage of a temperature IC such as
+ the LTC2997, 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
+
+ alpha-micro-volts-per-degree:
+ description: |
+ Output voltage gain of the temperature IC.
+
+ use-kelvin-scale:
+ type: boolean
+ description: |
+ Boolean indicating if alpha uses Kelvin degrees instead of Celsius.
+
+additionalProperties: false
+required:
+ - compatible
+ - io-channels
+ - alpha-micro-volts-per-degree
+
+examples:
+ - |
+ znq_temp: iio-rescale0 {
+ compatible = "temperature-sense-amplifier";
+ #io-channel-cells = <1>;
+ io-channels = <&temp_adc 3>;
+
+ use-kelvin-scale;
+ alpha-micro-volts-per-degree = <4000>;
+ };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 0eb7fcd94b66..f224bd8e6125 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8721,6 +8721,7 @@ L: linux-iio@xxxxxxxxxxxxxxx
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/temperature-sense-current.yaml
F: Documentation/devicetree/bindings/iio/afe/temperature-sense-rtd.yaml
F: Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml
--
2.30.1.489.g328c10930387