From nobody Fri Feb 13 07:17:57 2026 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D8A96F2F2; Thu, 12 Feb 2026 09:54:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=68.232.154.123 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770890086; cv=none; b=Cr6ZXDih2Q1Qdp97cAI8EXtM+I3CV0bkj8mcBMdpOaHSAC+Q5J69mpcrriqeQyS1sVtYHcGN3f/0rRWTWQUaDil5FwspB8z4XUleNF7NYx7SFrl+6EkWonAvHZei9DtWW3HiHx60U8SmbvdPCOz2lA0I3ACGxwMWS8z3AmV+bGw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770890086; c=relaxed/simple; bh=m2RrlM3o5MnN/ACfCP3s4GNoF/QM3p7mJauvf6/ROCc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-ID:References: In-Reply-To:To:CC; b=fBSk7xanS86LT8s+20nelpijMFk3d+1JTxO8rpbOSTtRy1Ks6G7S7wX9AX7Wi2M4cIAhb7iOCCU7V8pFtKYNQf2GOMtotXEtIU2YLD7cDBuCb9dQlGorPzDY+zATugaSMa6e771jHpO9VxeDztCeHoe1sVPj5tfEAbB91zLEZeU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=microchip.com; spf=pass smtp.mailfrom=microchip.com; dkim=pass (2048-bit key) header.d=microchip.com header.i=@microchip.com header.b=CIX0jzzP; arc=none smtp.client-ip=68.232.154.123 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=microchip.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=microchip.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=microchip.com header.i=@microchip.com header.b="CIX0jzzP" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1770890084; x=1802426084; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=m2RrlM3o5MnN/ACfCP3s4GNoF/QM3p7mJauvf6/ROCc=; b=CIX0jzzP7uqS+JEkc2g+VsaAIObvoz3bGs134mqZtzEs0SKX4Ujaw3XL 5ZHTNAPQ99Zm+Ii1a987RK8Yxcylf49P1e3/Yqh+bPFIpnaWo0akrQDdF /r3WSLQkhL1wtNSiYBb1hO7GYjtBIxkzC8ho0kOsbHJYBAbKevx2O503q el7Ec4mfgyIjWl96bgZIST2eyLOLueKvlhxqxzemcYaH36iHTiRUcJy1f aF4ILLhCXDcF8/HqlvB5BqXL3ISR87dWMCLw9xzzefaA6Bs9RrWP8xEGA CjxwBUGSd3zT/FqQ0dExQkAVm8OgFl/3eue3b5LvJDz+ISuw7aoQWgyVO g==; X-CSE-ConnectionGUID: +hNYLrEgQZyt9zv3ViVv4A== X-CSE-MsgGUID: 0vhPFDC3QhWOGqOCaULlqw== X-IronPort-AV: E=Sophos;i="6.21,286,1763449200"; d="scan'208";a="52579750" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa4.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Feb 2026 02:54:43 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.87.72) by chn-vm-ex1.mchp-main.com (10.10.87.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.2562.35; Thu, 12 Feb 2026 02:54:26 -0700 Received: from marius-VM.mshome.net (10.10.85.11) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.58 via Frontend Transport; Thu, 12 Feb 2026 02:54:23 -0700 From: Marius Cristea Date: Thu, 12 Feb 2026 11:54:07 +0200 Subject: [PATCH v6 1/2] dt-bindings: hwmon: temperature: add support for EMC1812 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <20260212-hw_mon-emc1812-v6-1-e37e9b38d898@microchip.com> References: <20260212-hw_mon-emc1812-v6-0-e37e9b38d898@microchip.com> In-Reply-To: <20260212-hw_mon-emc1812-v6-0-e37e9b38d898@microchip.com> To: Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Corbet CC: , , , , Marius Cristea X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=7664; i=marius.cristea@microchip.com; h=from:subject:message-id; bh=m2RrlM3o5MnN/ACfCP3s4GNoF/QM3p7mJauvf6/ROCc=; b=owGbwMvMwCW2tbSTZa7u0x2Mp9WSGDJ7FwfsdQ46cCj3ujen9dR1a8VudbyZFCpW9eyfS9rJ8 wULS2qvdJSyMIhxMciKKbKseOunVrX2w2UlsUwdmDmsTCBDGLg4BWAi+xcwMsxUfG7hYS9SP4fj yYxUt2lZM39Jrt1+otdGupCv763MsR0M/zMsP6wPv7+FOX1m5aKdirmrSgyexB2OsRGLODM5d/r uZwwA X-Developer-Key: i=marius.cristea@microchip.com; a=openpgp; fpr=E32F8D4396E72E463E8CCD91446DE0ABD9140C3E This is the devicetree schema for Microchip EMC1812/13/14/15/33 Multichannel Low-Voltage Remote Diode Sensor Family. 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. Signed-off-by: Marius Cristea Reviewed-by: Conor Dooley --- .../bindings/hwmon/microchip,emc1812.yaml | 196 +++++++++++++++++= ++++ MAINTAINERS | 6 + 2 files changed, 202 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..c19fa1fba98bd8b185fa7feb518= 3059532a0d781 --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/microchip,emc1812.yaml @@ -0,0 +1,196 @@ +# 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 + +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/Produc= tDocuments/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: + enum: [alert-therm2, therm-addr] + minItems: 1 + maxItems: 2 + + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + + microchip,enable-anti-parallel: + description: + Enable anti-parallel diode mode operation. EMC1814, EMC1815 and EMC1= 833 + support reading two external diodes in anti-parallel connection on t= he + 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 c= an + 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 a= ffect + the measurements. Due to the anti-parallel diode connections, channe= ls + 3 and 4 are affected together. + type: boolean + + vdd-supply: true + +patternProperties: + "^channel@[1-4]$": + description: + Represents the external temperature channels to which + a remote diode is connected. + type: object + + properties: + reg: + maxItems: 1 + + label: + description: Unique name to identify which channel this is. + + required: + - reg + + additionalProperties: false + +required: + - compatible + - reg + - vdd-supply + +allOf: + # EMC1812: 1 Channel, No APD, REC on channel 1 + - if: + properties: + compatible: + const: microchip,emc1812 + then: + properties: + microchip,enable-anti-parallel: false + microchip,parasitic-res-on-channel3-4: false + patternProperties: + "^channel@[2-4]$": false + + # EMC1813: 2 Channels, No APD, REC 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]$": false + + # EMC1833: 2 Channels, Supports APD, REC on both channel 1 & 2 + - if: + properties: + compatible: + const: microchip,emc1833 + then: + properties: + microchip,parasitic-res-on-channel3-4: false + patternProperties: + "^channel@[3-4]$": false + + # EMC1814: 3 Channels, Supports APD, + # REC on both channel 1 & 2 and channel 3 + - if: + properties: + compatible: + const: microchip,emc1814 + then: + properties: + channel@4: false + + # EMC1815: 4 Channels, Supports APD, REC on 1-2 and 3-4 + - if: + properties: + compatible: + const: microchip,emc1815 + then: + # No restrictions needed, but explicitly allowing them is good docum= entation + properties: + microchip,enable-anti-parallel: true + microchip,parasitic-res-on-channel1-2: true + microchip,parasitic-res-on-channel3-4: true + +additionalProperties: false + +examples: + - | + i2c { + #address-cells =3D <1>; + #size-cells =3D <0>; + + temperature-sensor@4c { + compatible =3D "microchip,emc1813"; + reg =3D <0x4c>; + + #address-cells =3D <1>; + #size-cells =3D <0>; + + microchip,parasitic-res-on-channel1-2; + + vdd-supply =3D <&vdd>; + + channel@1 { + reg =3D <1>; + label =3D "External CH1 Temperature"; + }; + + channel@2 { + reg =3D <2>; + label =3D "External CH2 Temperature"; + }; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 6d7b697bfdba16e4f0ee5f4f0195b9d7da06dae5..85c236df781e47c78deeb7ef4d8= 0bc94bba604c4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16646,6 +16646,12 @@ S: Supported F: Documentation/devicetree/bindings/interrupt-controller/microchip,sama7g= 5-eic.yaml F: drivers/irqchip/irq-mchp-eic.c =20 +MICROCHIP EMC1812 DRIVER +M: Marius Cristea +L: linux-hwmon@vger.kernel.org +S: Supported +F: Documentation/devicetree/bindings/hwmon/microchip,emc1812.yaml + MICROCHIP I2C DRIVER M: Codrin Ciubotariu L: linux-i2c@vger.kernel.org --=20 2.51.0