[PATCH v2 04/16] dt-bindings: mfd: mediatek: mt6397: 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.

While mt6323 exposes only a single thermal sensor, newer PMICs like
mt6358 provide more than one sensor. Therefore define #thermal-sensor-cells
as 1 to avoid breaking devicetree ABI in the future.

Signed-off-by: Roman Vivchar <rva333@protonmail.com>
---
 .../devicetree/bindings/mfd/mediatek,mt6397.yaml   | 44 ++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml b/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
index beaa67bf0df2..2c826737189e 100644
--- a/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
+++ b/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
@@ -242,6 +242,31 @@ properties:
     description:
       Pin controller
 
+  thermal:
+    type: object
+    unevaluatedProperties: false
+    description:
+      PMIC thermal monitoring
+
+    properties:
+      compatible:
+        const: mediatek,mt6323-thermal
+
+      io-channels:
+        description:
+          IIO channel for the AUXADC to read raw data from.
+        maxItems: 1
+
+      nvmem-cells:
+        maxItems: 1
+
+      "#thermal-sensor-cells":
+        const: 1
+    required:
+      - compatible
+      - io-channels
+      - "#thermal-sensor-cells"
+
 required:
   - compatible
   - regulators
@@ -250,6 +275,7 @@ additionalProperties: false
 
 examples:
   - |
+    #include <dt-bindings/iio/adc/mediatek,mt6323-auxadc.h>
     #include <dt-bindings/interrupt-controller/arm-gic.h>
     #include <dt-bindings/leds/common.h>
 
@@ -262,6 +288,16 @@ examples:
 
         efuse {
           compatible = "mediatek,mt6323-efuse";
+
+          nvmem-layout {
+            compatible = "fixed-layout";
+            #address-cells = <1>;
+            #size-cells = <1>;
+
+            mt6323_thermal_calibration_data: thermal-data@14 {
+              reg = <0x14 0x4>;
+            };
+          };
         };
 
         leds {
@@ -511,6 +547,14 @@ examples:
         rtc {
             compatible = "mediatek,mt6323-rtc";
         };
+
+        thermal {
+          compatible = "mediatek,mt6323-thermal";
+          nvmem-cells = <&mt6323_thermal_calibration_data>;
+
+          io-channels = <&mt6323_adc MT6323_AUXADC_CHIP_TEMP>;
+          #thermal-sensor-cells = <1>;
+        };
     };
 
   - |

-- 
2.54.0