dt-bindings: thermal: amlogic: Add support for T7

Add the amlogic,t7-thermal compatible for the Amlogic T7 thermal sensor.

Unlike existing variants which use a phandle to the ao-secure syscon,
the T7 relies on a secure monitor interface described by a phandle and
a sensor index argument.

The T7 integrates multiple thermal sensors, all accessed through the
same SMC call. The sensor index argument is required to identify which
sensor's calibration data the secure monitor should return, as a single
SM_THERMAL_CALIB_READ command serves all of them.

Introduce the amlogic,secure-monitor property as a phandle-array and
make amlogic,ao-secure or amlogic,secure-monitor conditionally required
depending on the compatible.

Signed-off-by: Ronald Claveau <linux-kernel-dev@aliel.fr>
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260424-add-thermal-t7-vim4-v5-1-9040ca36afe2@aliel.fr

Documentation/devicetree/bindings/thermal/amlogic,thermal.yaml

@@ -21,7 +21,9 @@ properties:
               - amlogic,g12a-cpu-thermal
               - amlogic,g12a-ddr-thermal
           - const: amlogic,g12a-thermal
-      - const: amlogic,a1-cpu-thermal
+      - enum:
+          - amlogic,a1-cpu-thermal
+          - amlogic,t7-thermal
 
   reg:
     maxItems: 1
@@ -42,12 +44,34 @@ properties:
   '#thermal-sensor-cells':
     const: 0
 
+  amlogic,secure-monitor:
+    description: phandle to the secure monitor
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: phandle to the secure monitor
+          - description: sensor index to get specific calibration data
+
 required:
   - compatible
   - reg
   - interrupts
   - clocks
-  - amlogic,ao-secure
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - amlogic,a1-cpu-thermal
+              - amlogic,g12a-thermal
+    then:
+      required:
+        - amlogic,ao-secure
+    else:
+      required:
+        - amlogic,secure-monitor
 
 unevaluatedProperties: false
 
@@ -62,4 +86,13 @@ examples:
         #thermal-sensor-cells = <0>;
         amlogic,ao-secure = <&sec_AO>;
     };
+  - |
+    temperature-sensor@20000 {
+        compatible = "amlogic,t7-thermal";
+        reg = <0x0 0x20000 0x0 0x50>;
+        interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clkc_periphs CLKID_TS>;
+        #thermal-sensor-cells = <0>;
+        amlogic,secure-monitor = <&sm 1>;
+    };
 ...