linux-kernel - [PATCH 2/6] dt-bindings: iio: mcp9600: Add microchip,mcp9601 and add constraints

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Message-Id: <20250818183214.380847-3-bcollins@kernel.org>
Date: Mon, 18 Aug 2025 14:32:10 -0400
From: Ben Collins <bcollins@...nel.org>
To: Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Andrew Hepp <andrew.hepp@...pp.dev>
Cc: Ben Collins <bcollins@...ter.com>,
	linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/6] dt-bindings: iio: mcp9600: Add microchip,mcp9601 and add constraints

From: Ben Collins <bcollins@...ter.com>

Add microchip,mcp9601 compatible in addition to the original
microchip,mcp9600 to designate support between these two chips.

The current dt-binding has open-circuit and short-circuit as interrupt
names, but these are only supported in mcp9601.

The OC and SC detection requires that mcp9601 VSENSE be wired up, which
not only enables the OC SC interrupts, but also the OC and SC status
register bits.

Add a microchip,vsense boolean to show the chip is wired for this
support.

Add constraints so this feature only applies if the mcp9601 compatible
is selected.

Signed-off-by: Ben Collins <bcollins@...ter.com>
---
 .../iio/temperature/microchip,mcp9600.yaml    | 60 ++++++++++++++++++-
 1 file changed, 57 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/temperature/microchip,mcp9600.yaml b/Documentation/devicetree/bindings/iio/temperature/microchip,mcp9600.yaml
index 57b387a1accc..c22edb4ab852 100644
--- a/Documentation/devicetree/bindings/iio/temperature/microchip,mcp9600.yaml
+++ b/Documentation/devicetree/bindings/iio/temperature/microchip,mcp9600.yaml
@@ -4,7 +4,7 @@
 $id: http://devicetree.org/schemas/iio/temperature/microchip,mcp9600.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Microchip MCP9600 thermocouple EMF converter
+title: Microchip MCP9600 and similar thermocouple EMF converters
 
 maintainers:
   - Andrew Hepp <andrew.hepp@...pp.dev>
@@ -14,7 +14,11 @@ description:
 
 properties:
   compatible:
-    const: microchip,mcp9600
+    oneOf:
+      - const: microchip,mcp9600
+      - items:
+          - const: microchip,mcp9601
+          - const: microchip,mcp9600
 
   reg:
     maxItems: 1
@@ -34,6 +38,8 @@ properties:
         - alert2
         - alert3
         - alert4
+        - open-circuit
+        - short-circuit
 
   thermocouple-type:
     $ref: /schemas/types.yaml#/definitions/uint32
@@ -43,8 +49,37 @@ properties:
       Use defines in dt-bindings/iio/temperature/thermocouple.h.
       Supported types are B, E, J, K, N, R, S, T.
 
+  microchip,vsense:
+    type: boolean
+    description:
+      This flag indicates that the chip has been wired with VSENSE to
+      enable open and short circuit detect.
+
   vdd-supply: true
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          not:
+            contains:
+              const: microchip,mcp9601
+    then:
+      properties:
+        interrupts:
+          minItems: 1
+          maxItems: 4
+        interrupt-names:
+          minItems: 1
+          maxItems: 4
+          items:
+            enum:
+              - alert1
+              - alert2
+              - alert3
+              - alert4
+        microchip,vsense: false
+
 required:
   - compatible
   - reg
@@ -64,8 +99,27 @@ examples:
             reg = <0x60>;
             interrupt-parent = <&gpio>;
             interrupts = <25 IRQ_TYPE_EDGE_RISING>;
-            interrupt-names = "open-circuit";
+            interrupt-names = "alert1";
             thermocouple-type = <THERMOCOUPLE_TYPE_K>;
             vdd-supply = <&vdd>;
         };
     };
+  - |
+    #include <dt-bindings/iio/temperature/thermocouple.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        temperature-sensor@62 {
+            compatible = "microchip,mcp9601",
+                         "microchip,mcp9600";
+            microchip,vsense;
+            reg = <0x62>;
+            interrupt-parent = <&gpio>;
+            interrupts = <22 IRQ_TYPE_EDGE_RISING
+                          23 IRQ_TYPE_EDGE_RISING>;
+            interrupt-names = "open-circuit", "short-circuit";
+            vdd-supply = <&vdd>;
+        };
+    };
-- 
2.39.5