| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20251029-hw_mon-emc1812-v1-1-be4fd8af016a@microchip.com>
Date: Wed, 29 Oct 2025 17:50:58 +0200
From: Marius Cristea <marius.cristea@...rochip.com>
To: Guenter Roeck <linux@...ck-us.net>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
Jonathan Corbet <corbet@....net>
CC: <linux-hwmon@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>, Marius Cristea
<marius.cristea@...rochip.com>
Subject: [PATCH 1/2] dt-bindings: hwmon: temperature: add support for
EMC1812
This is the devicetree schema for Microchip EMC1812/13/14/15/33
Multichannel Low-Voltage Remote Diode Sensor Family.
Signed-off-by: Marius Cristea <marius.cristea@...rochip.com>
---
.../bindings/hwmon/microchip,emc1812.yaml | 176 +++++++++++++++++++++
MAINTAINERS | 6 +
2 files changed, 182 insertions(+)
diff --git a/Documentation/devicetree/bindings/hwmon/microchip,emc1812.yaml b/Documentation/devicetree/bindings/hwmon/microchip,emc1812.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..cc4c7bb53cb13416c1e9419cc8c6c8a56da22df8
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/microchip,emc1812.yaml
@@ -0,0 +1,176 @@
+# 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@...rochip.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
+
+properties:
+ compatible:
+ enum:
+ - microchip,emc1812
+ - microchip,emc1813
+ - microchip,emc1814
+ - microchip,emc1815
+ - microchip,emc1833
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 2
+
+ interrupt-names:
+ description:
+ -alert-therm2 asserts when a diode temperature exceeds the ALERT
+ threshold.
+ -therm-addr asserts low when the hardware-set THERM limit threshold is
+ exceeded by one of the temperature sensors.
+ items:
+ - const: alert-therm2
+ - const: therm-addr
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+ 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]$":
+ description:
+ Represents the external temperature channels to which
+ a remote diode is connected.
+ type: object
+
+ properties:
+ reg:
+ items:
+ minimum: 1
+ maximum: 4
+
+ label:
+ description: Unique name to identify which channel this is.
+
+ required:
+ - reg
+
+ additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - vdd-supply
+
+allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - microchip,emc1812
+ - microchip,emc1813
+ - microchip,emc1833
+ then:
+ properties:
+ microchip,parasitic-res-on-channel3-4: false
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - microchip,emc1812
+ then:
+ properties:
+ channel@1:
+ properties:
+ reg:
+ items:
+ const: 1
+ patternProperties:
+ "^channel@[2-4]$": false
+ - if:
+ properties:
+ compatible:
+ pattern: "^microchip,emc18[13]3"
+ then:
+ patternProperties:
+ "^channel@[12]$":
+ properties:
+ reg:
+ items:
+ maximum: 2
+ "^channel@[34]$": false
+ - if:
+ properties:
+ compatible:
+ pattern: "^microchip,emc1814"
+ then:
+ patternProperties:
+ "^channel@[1-3]$":
+ properties:
+ reg:
+ items:
+ maximum: 3
+ properties:
+ channel@4: false
+
+additionalProperties: 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";
+ };
+ };
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 6d7b697bfdba16e4f0ee5f4f0195b9d7da06dae5..85c236df781e47c78deeb7ef4d80bc94bba604c4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16646,6 +16646,12 @@ S: Supported
F: Documentation/devicetree/bindings/interrupt-controller/microchip,sama7g5-eic.yaml
F: drivers/irqchip/irq-mchp-eic.c
+MICROCHIP EMC1812 DRIVER
+M: Marius Cristea <marius.cristea@...rochip.com>
+L: linux-hwmon@...r.kernel.org
+S: Supported
+F: Documentation/devicetree/bindings/hwmon/microchip,emc1812.yaml
+
MICROCHIP I2C DRIVER
M: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
L: linux-i2c@...r.kernel.org
--
2.48.1
Powered by blists - more mailing lists