[PATCH v5 1/2] dt-bindings: iio: temperature: add support for MCP998X

[<victor.duicu@microchip.com>]

From: Victor Duicu <victor.duicu@microchip.com>

This is the devicetree schema for Microchip MCP998X/33 and MCP998XD/33D
Multichannel Automotive Temperature Monitor Family.

Signed-off-by: Victor Duicu <victor.duicu@microchip.com>
---
 .../iio/temperature/microchip,mcp9982.yaml    | 186 ++++++++++++++++++
 MAINTAINERS                                   |   6 +
 2 files changed, 192 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/temperature/microchip,mcp9982.yaml

diff --git a/Documentation/devicetree/bindings/iio/temperature/microchip,mcp9982.yaml b/Documentation/devicetree/bindings/iio/temperature/microchip,mcp9982.yaml
new file mode 100644
index 000000000000..5aaf9ae2b862
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/temperature/microchip,mcp9982.yaml
@@ -0,0 +1,186 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/temperature/microchip,mcp9982.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip MCP998X/33 and MCP998XD/33D Multichannel Automotive
+       Temperature Monitor Family
+
+maintainers:
+  - Victor Duicu <victor.duicu@microchip.com>
+
+description: |
+  The MCP998X/33 and MCP998XD/33D family is a high-accuracy 2-wire multichannel
+  automotive temperature monitor.
+  The datasheet can be found here:
+    https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/MCP998X-Family-Data-Sheet-DS20006827.pdf
+
+properties:
+  compatible:
+    enum:
+      - microchip,mcp9933
+      - microchip,mcp9933d
+      - microchip,mcp9982
+      - microchip,mcp9982d
+      - microchip,mcp9983
+      - microchip,mcp9983d
+      - microchip,mcp9984
+      - microchip,mcp9984d
+      - microchip,mcp9985
+      - microchip,mcp9985d
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: Signal coming from ALERT/THERM pin.
+      - description: Signal coming from THERM/ADDR pin.
+      - description: Signal coming from SYS_SHDN pin.
+
+  interrupt-names:
+    items:
+      - const: alert-therm
+      - const: therm-addr
+      - const: sys-shutdown
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  microchip,enable-anti-parallel:
+    description:
+      Enable anti-parallel diode mode operation.
+      MCP9984/84D/85/85D and MCP9933/33D support reading two external diodes
+      in anti-parallel connection on the same set of pins.
+    type: boolean
+
+  microchip,parasitic-res-on-channel1-2:
+    description:
+      Indicates that the chip and the diodes/transistors are sufficiently far
+      apart that a parasitic resistance is added to the wires, which can affect
+      the measurements. Due to the anti-parallel diode connections, channels
+      1 and 2 are affected together.
+    type: boolean
+
+  microchip,parasitic-res-on-channel3-4:
+    description:
+      Indicates that the chip and the diodes/transistors are sufficiently far
+      apart that a parasitic resistance is added to the wires, which can affect
+      the measurements. Due to the anti-parallel diode connections, channels
+      3 and 4 are affected together.
+    type: boolean
+
+  vdd-supply: true
+
+patternProperties:
+  "^channel@[1-4]$":
+    description:
+      Represents the external temperature channels to which
+      a remote diode is connected.
+    type: object
+
+    properties:
+      reg:
+        items:
+          minItems: 1
+          maxItems: 4
+
+      label:
+        description: Unique name to identify which channel this is.
+
+    required:
+      - reg
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - vdd-supply
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            pattern: '^.+d$'
+    then:
+      properties:
+        interrupts-names:
+          items:
+            - const: alert-therm
+            - const: sys-shutdown
+    else:
+      properties:
+        interrupts-names:
+          items:
+            - const: alert-therm
+            - const: therm-addr
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            pattern: '^microchip,mcp998(2|3)$'
+    then:
+      properties:
+        microchip,enable-anti-parallel: false
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            pattern: '^microchip,mcp998(2|3)d$'
+    then:
+      properties:
+        microchip,enable-anti-parallel: false
+        microchip,parasitic-res-on-channel1-2: true
+        microchip,parasitic-res-on-channel3-4: true
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            pattern: 'microchip,mcp99(33|8[4-5])d$'
+    then:
+      properties:
+        microchip,parasitic-res-on-channel1-2: true
+        microchip,parasitic-res-on-channel3-4: true
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        temperature-sensor@4c {
+            compatible = "microchip,mcp9985";
+            reg = <0x4c>;
+
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            microchip,enable-anti-parallel;
+            microchip,parasitic-res-on-channel1-2;
+            microchip,parasitic-res-on-channel3-4;
+            vdd-supply = <&vdd>;
+
+            channel@1 {
+                reg = <1>;
+                label = "CPU Temperature";
+            };
+
+            channel@2 {
+                reg = <2>;
+                label = "GPU Temperature";
+            };
+        };
+    };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index d53a536288ca..37530194c9fb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16662,6 +16662,12 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml
 F:	drivers/iio/adc/mcp3911.c
 
+MICROCHIP MCP9982 TEMPERATURE DRIVER
+M:	Victor Duicu <victor.duicu@microchip.com>
+L:	linux-iio@vger.kernel.org
+S:	Supported
+F:	Documentation/devicetree/bindings/iio/temperature/microchip,mcp9982.yaml
+
 MICROCHIP MMC/SD/SDIO MCI DRIVER
 M:	Aubin Constans <aubin.constans@microchip.com>
 S:	Maintained
-- 
2.48.1