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

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Message-Id: <20210530005917.20953-10-liambeguin@gmail.com>
Date:   Sat, 29 May 2021 20:59:17 -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 v1 9/9] 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 one cases, the measurement of a temperature through a
voltage sense amplifier such as the LTC2997.

Signed-off-by: Liam Beguin <lvb@...hos.com>
---
 .../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@...hos.com>
+
+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@...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/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