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Message-ID: <20250918111937.5150-2-victor.duicu@microchip.com>
Date: Thu, 18 Sep 2025 14:19:36 +0300
From: <victor.duicu@...rochip.com>
To: <jic23@...nel.org>, <dlechner@...libre.com>, <nuno.sa@...log.com>,
<andy@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
<conor+dt@...nel.org>
CC: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>, <marius.cristea@...rochip.com>,
<victor.duicu@...rochip.com>
Subject: [PATCH v5 1/2] dt-bindings: iio: temperature: add support for MCP998X
From: Victor Duicu <victor.duicu@...rochip.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@...rochip.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@...rochip.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@...rochip.com>
+L: linux-iio@...r.kernel.org
+S: Supported
+F: Documentation/devicetree/bindings/iio/temperature/microchip,mcp9982.yaml
+
MICROCHIP MMC/SD/SDIO MCI DRIVER
M: Aubin Constans <aubin.constans@...rochip.com>
S: Maintained
--
2.48.1
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