[PATCH 03/13] dt-bindings: thermal: add mt6323 PMIC thermal

[Roman Vivchar via B4 Relay <devnull+rva333.protonmail.com@kernel.org>]

From: Roman Vivchar <rva333@protonmail.com>

The MediaTek mt6323 PMIC temperature can be read using AUXADC channel.

Add the devicetree binding documentation for the MediaTek mt6323 thermal.
Due similarities with newer PMICs like mt6358, which include more than
one thermal sensor, the #thermal-sensor-cells should be set to 1, to
avoid breaking devicetree ABI in future.

Tested-by: Ben Grisdale <bengris32@protonmail.ch> # Amazon Echo Dot (2nd Generation)
Signed-off-by: Roman Vivchar <rva333@protonmail.com>
---
 .../bindings/thermal/mediatek,mt6323-thermal.yaml  | 63 ++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/Documentation/devicetree/bindings/thermal/mediatek,mt6323-thermal.yaml b/Documentation/devicetree/bindings/thermal/mediatek,mt6323-thermal.yaml
new file mode 100644
index 000000000000..1882816ba274
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/mediatek,mt6323-thermal.yaml
@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/mediatek,mt6323-thermal.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek PMIC thermal
+
+maintainers:
+  - Roman Vivchar <rva333@protonmail.com>
+
+description:
+  The MediaTek PMIC thermal sensor uses an AUXADC channel to read raw
+  temperature data and applies calibration data from NVMEM.
+
+allOf:
+  - $ref: thermal-sensor.yaml#
+
+properties:
+  compatible:
+    const: mediatek,mt6323-thermal
+
+  io-channels:
+    description: >
+      IIO channel for the AUXADC to read raw data from.
+    maxItems: 1
+
+  io-channel-names:
+    const: vts
+
+  nvmem-cells:
+    description: >
+      NVMEM cell with phandle to the calibration data provided by the
+      NVMEM device. If unspecified default values will be used.
+    maxItems: 1
+
+  nvmem-cell-names:
+    const: calibration-data
+
+  "#thermal-sensor-cells":
+    const: 1
+
+required:
+  - compatible
+  - io-channels
+  - io-channel-names
+  - "#thermal-sensor-cells"
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/iio/adc/mediatek,mt6323-auxadc.h>
+
+    mt6323_thermal: thermal {
+      compatible = "mediatek,mt6323-thermal";
+      nvmem-cells = <&mt6323_thermal_calibration_data>;
+      nvmem-cell-names = "calibration-data";
+
+      io-channels = <&mt6323_adc MT6323_AUXADC_CHIP_TEMP>;
+      io-channel-names = "vts";
+      #thermal-sensor-cells = <1>;
+    };

-- 
2.53.0