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Message-ID: <20250613130207.8560-2-victor.duicu@microchip.com>
Date: Fri, 13 Jun 2025 16:02:06 +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: <marius.cristea@...rochip.com>, <victor.duicu@...rochip.com>,
<linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>
Subject: [PATCH v3 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 Automotive Temperature Monitor Family.
Signed-off-by: Victor Duicu <victor.duicu@...rochip.com>
---
.../iio/temperature/microchip,mcp9982.yaml | 211 ++++++++++++++++++
1 file changed, 211 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..ec939d463612
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/temperature/microchip,mcp9982.yaml
@@ -0,0 +1,211 @@
+# 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:
+ minItems: 2
+ maxItems: 2
+
+ interrupt-names:
+ description:
+ -alert-therm is used to handle a HIGH or LOW limit.
+ -therm-addr is used to handle a THERM limit on chips
+ without "D" in the name.
+ -sys-shutdown is used to handle a THERM limit on chips
+ with "D" in the name.
+ 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,beta1:
+ description:
+ Set beta compensation value for external channel 1.
+ <0> 0.050
+ <1> 0.066
+ <2> 0.087
+ <3> 0.114
+ <4> 0.150
+ <5> 0.197
+ <6> 0.260
+ <7> 0.342
+ <8> 0.449
+ <9> 0.591
+ <10> 0.778
+ <11> 1.024
+ <12> 1.348
+ <13> 1.773
+ <14> 2.333
+ <15> Diode_Mode
+ <16> Auto
+ - Diode_Mode is used when measuring a discrete thermal diode
+ or a CPU diode that functions like a discrete thermal diode.
+ - Auto enables beta auto-detection. The chip monitors
+ external diode/transistor and determines the optimum
+ setting.
+ $ref: /schemas/types.yaml#/definitions/uint32
+ default: 16
+
+ microchip,beta2:
+ description:
+ Set beta compensation value for external channel 2.
+ $ref: /schemas/types.yaml#/definitions/uint32
+ default: 16
+
+ microchip,resistance-comp-ch1-2-enable:
+ description:
+ Enable resistance error correction(REC) for external channels 1 and 2.
+ The chip internal hardware counterbalances the parasitic resistance in
+ series with the external diodes. The compensation can be activated or
+ disabled in hardware for both channels 1 and 2 at the same time.
+ type: boolean
+
+ microchip,resistance-comp-ch3-4-enable:
+ description:
+ Enable resistance error correction(REC) for external channels 3 and 4.
+ The chip internal hardware counterbalances the parasitic resistance in
+ series with the external diodes. The compensation can be activated or
+ disabled in hardware for both channels 3 and 4 at the same time.
+ type: boolean
+
+
+ vdd-supply: true
+
+patternProperties:
+ "^channel@[1-4]$":
+ description:
+ Represents the external temperature channels to which
+ a remote diode is connected.
+ type: object
+
+ properties:
+ reg:
+ items:
+ minimum: 1
+ maximum: 4
+
+ microchip,ideality-factor:
+ description:
+ Each channel has an ideality factor.
+ Beta compensation and resistance error correction automatically
+ correct for most ideality errors. So ideality factor does not need
+ to be adjusted in general.
+ $ref: /schemas/types.yaml#/definitions/uint32
+ default: 18
+
+ label:
+ description: Unique name to identify which channel this is.
+
+ required:
+ - reg
+
+ additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - vdd-supply
+
+allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - microchip,mcp9982d
+ - microchip,mcp9983d
+ - microchip,mcp9984d
+ - microchip,mcp9985d
+ - microchip,mcp9933d
+ then:
+ properties:
+ interrupts-names:
+ items:
+ - const: alert-therm
+ - const: sys-shutdown
+ else:
+ properties:
+ interrupts-names:
+ items:
+ - const: alert-therm
+ - const: therm-addr
+
+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,resistance-comp-ch1-2-enable;
+ microchip,resistance-comp-ch3-4-enable;
+ microchip,beta1 = <16>;
+ microchip,beta2 = <16>;
+ vdd-supply = <&vdd>;
+
+ channel@1 {
+ reg = <1>;
+ label = "CPU Temperature";
+ };
+
+ channel@2 {
+ reg = <2>;
+ label = "GPU Temperature";
+ };
+ };
+ };
+
+...
--
2.48.1
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