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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/hwmon/microchip,emc1812.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Microchip EMC1812/13/14/15/33 multichannel temperature sensor
maintainers:
- Marius Cristea <marius.cristea@microchip.com>
description: |
The Microchip EMC1812/13/14/15/33 is a high-accuracy 2-wire multichannel
low-voltage remote diode temperature monitor.
The datasheet can be found here:
https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/EMC1812-3-4-5-33-Data-Sheet-DS20005751.pdf
EMC1812 has one external remote temperature monitoring channel
EMC1813 has two external remote temperature monitoring channels
EMC1814 has three external remote temperature monitoring channels and
channels 2 and 3 support anti parallel diode
EMC1815 has four external remote temperature monitoring channels and
channels 1/2 and 3/4 support anti parallel diode
EMC1833 has two external remote temperature monitoring channels and
channels 1 and 2 support anti parallel diode
properties:
compatible:
enum:
- microchip,emc1812
- microchip,emc1813
- microchip,emc1814
- microchip,emc1815
- microchip,emc1833
reg:
maxItems: 1
interrupts:
items:
- description: alert-therm2 asserts when the ALERT limit is exceeded.
- description: therm-addr asserts when the THERM limit is exceeded.
minItems: 1
interrupt-names:
items:
- const: alert-therm2
- const: therm-addr
minItems: 1
"#address-cells":
const: 1
"#size-cells":
const: 0
microchip,enable-anti-parallel:
description:
Enable anti-parallel diode mode operation. EMC1814, EMC1815 and EMC1833
support reading two external diodes in anti-parallel connection on the
same set of pins. Disabling APD functionality to implement substrate
diodes on devices that support APD eliminates the benefit of APD
(two diodes on one channel).
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 availability of only a single
configuration bit in hardware, channels 1 and 2 are affected together.
If channel 2 is not available in hardware, this setting affects only
channel 1.
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 availability of only a single
configuration bit in hardware, channels 3 and 4 are affected together.
If channel 4 is not available in hardware, this setting affects only
channel 3.
type: boolean
vdd-supply: true
patternProperties:
"^channel@[0-4]$":
description: |
Represents the temperature channels.
0: Internal sensor
1-4: External remote diodes
type: object
properties:
reg:
maxItems: 1
label:
description: Unique name to identify which channel this is.
required:
- reg
additionalProperties: false
required:
- compatible
- reg
- vdd-supply
allOf:
# EMC1812: 1 Internal, 1 External Channels, No APD,
# parasitic-res-on-channel1-2: for channel 1
- if:
properties:
compatible:
const: microchip,emc1812
then:
properties:
microchip,enable-anti-parallel: false
microchip,parasitic-res-on-channel3-4: false
patternProperties:
"^channel@[2-4]$": false
# EMC1813: 1 Internal, 2 External Channels, No APD,
# parasitic-res-on-channel1-2: on both channel 1 & 2
- if:
properties:
compatible:
const: microchip,emc1813
then:
properties:
microchip,enable-anti-parallel: false
microchip,parasitic-res-on-channel3-4: false
patternProperties:
"^channel@[3-4]$": false
# EMC1833: 1 Internal, 2 External Channels, Supports APD,
# parasitic-res-on-channel1-2: on both channel 1 & 2
- if:
properties:
compatible:
const: microchip,emc1833
then:
properties:
microchip,parasitic-res-on-channel3-4: false
patternProperties:
"^channel@[3-4]$": false
# EMC1814: 1 Internal, 3 External Channels, Supports APD,
# parasitic-res-on-channel1-2: on both channel 1 & 2
# parasitic-res-on-channel3-4: for channel 3
- if:
properties:
compatible:
const: microchip,emc1814
then:
properties:
channel@4: false
unevaluatedProperties: false
examples:
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
temperature-sensor@4c {
compatible = "microchip,emc1813";
reg = <0x4c>;
#address-cells = <1>;
#size-cells = <0>;
microchip,parasitic-res-on-channel1-2;
vdd-supply = <&vdd>;
channel@1 {
reg = <1>;
label = "External CH1 Temperature";
};
channel@2 {
reg = <2>;
label = "External CH2 Temperature";
};
};
};
|
