From nobody Wed Apr 1 22:18:44 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 877192D7398; Tue, 10 Mar 2026 14:51:43 +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=1773154305; cv=none; b=sKm3KAllWGgU2dNU7CdxojYDD8hncBdKDhnuc0WN8FGz6X2hxnQvMKsTENIq9UFql/OsFYuP7YEca3hDKgMNN72CzglKWgMEOid8RQamDoICUpv5u63adcIIx5VDDuIVpexZ+Tv8/gcwWwhdSntCmPPtATvfrF8knWoGygqQK8c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773154305; c=relaxed/simple; bh=5hnXVk1/Ug9djFJ9/2YKeSEXMedBGO3Wos0yAnBHOYs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-ID:References: In-Reply-To:To:CC; b=D+hRhvNCph2t/kzNhuv3ONcnz/yymVTjJtX7Y4Jc78w0uKSowb0FX/WQs9J+ieZnz6vmvLpDsAkV/0QRO/1YzC4FQIM7LMWfP64Oz28XtWOKhvSKQDwmdcMOL/eo1IYL+Cc5Q0V7MUHj8OSaQqtWbMqJR5ww/NM5aRIZ5/A0lz4= 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=gLNIzZVy; 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="gLNIzZVy" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1773154303; x=1804690303; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=5hnXVk1/Ug9djFJ9/2YKeSEXMedBGO3Wos0yAnBHOYs=; b=gLNIzZVyf6CgXDaWFU6rwiqLAPYUwc3Ey4JEF5uX8D1dOR2v4zM8patO 19xz+2lal+jyrWZFzv9kIjO4BvS0+abpu0f3o6aH/Bu15diDq14FaVZFm TqgboaAYosmRcJpQX9/+m3N8TAGqYmUMyiUq0hWnRt1PLVtwDhpJKrPJS C1CduY4G9BbFLRbaFjV39PWhaklS61B+hAWqp+2hVYVcgl0Gkv2ZM6laP B3BV7qN0zUExZTo1ibxwbJ30/U9tv6ygiU58RaoDppCPMQUlz99Pk/Vaj I3kp/3KP6y+m2J0wK42/9wfjnayzY0eVaP11TeQw9HnqB90lSFU/kSQFd g==; X-CSE-ConnectionGUID: FWHYr/n3Reu+4CnCsaN6IQ== X-CSE-MsgGUID: JSnZQ3RFS1OCVoNbinACsQ== X-IronPort-AV: E=Sophos;i="6.23,112,1770620400"; d="scan'208";a="53713924" 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-AES128-GCM-SHA256; 10 Mar 2026 07:51:36 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.58; Tue, 10 Mar 2026 07:51:16 -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; Tue, 10 Mar 2026 07:51:13 -0700 From: Marius Cristea Date: Tue, 10 Mar 2026 16:50:45 +0200 Subject: [PATCH v8 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: <20260310-hw_mon-emc1812-v8-1-bc155727e0d2@microchip.com> References: <20260310-hw_mon-emc1812-v8-0-bc155727e0d2@microchip.com> In-Reply-To: <20260310-hw_mon-emc1812-v8-0-bc155727e0d2@microchip.com> To: Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Corbet CC: , , , , Marius Cristea , Conor Dooley X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=7296; i=marius.cristea@microchip.com; h=from:subject:message-id; bh=5hnXVk1/Ug9djFJ9/2YKeSEXMedBGO3Wos0yAnBHOYs=; b=owGbwMvMwCW2tbSTZa7u0x2Mp9WSGDI36N8LldQT2VTTNfvR1Kc5Mbb/TdR/sAZobVdv3GA9m Z2hQKito5SFQYyLQVZMkWXFWz+1qrUfLiuJZerAzGFlAhnCwMUpABOJ+sDwTzl8ldGhn18Of5hq f1/P2NPVOfDj/PT2lHV7tqxPlnKZGMjI8PfS0qfGMokHbgfIqZwXUtBSmXjE96r5vasTrp7O3H+ 3lQkA 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 | 184 +++++++++++++++++= ++++ MAINTAINERS | 6 + 2 files changed, 190 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..5f766a3b6a297cdc9bdfff2215f= ce6fa41434f0a --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/microchip,emc1812.yaml @@ -0,0 +1,184 @@ +# 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 + +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