From nobody Tue Feb 10 04:14:39 2026 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.153.233]) (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 2280E361656; Tue, 27 Jan 2026 15:06:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=68.232.153.233 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769526377; cv=none; b=qx7ogisfOMsVWOQz62KMtyZ/V6p9LrQLotYFVRv7l7RdbAZ4J/L5i1vnp35D1uR/1bdiuWh77SCUIJ/Zgu6MQUC870iZlf3dLnyEm/nvAzrqNINx9T/7pzwiTPGccVHc61DDy8mFf7r1TbvyUAk6JopFi6c7CZmxLZgBaP7uscc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769526377; c=relaxed/simple; bh=OrchZcNzVkiRDk/IccOTw5EqSHvJfTxEqYaQxnqjGaw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-ID:References: In-Reply-To:To:CC; b=Yyuc1Ta9DMPwlDeXuIa3QmqshA01AFccxBgoWZpF/wF0RVaNEe7Ii0MDAPgiD7qffuZcPKe0kHpBFj6u2oGJxy0DqsCkVUAXaisEJJ7Ld9Gl6aRDzj6wTNJcxVWYdVDrpbk+82fV/F5/2Krv75E5tyw74JS6NydSy/CS1Slucc4= 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=riRz4F3w; arc=none smtp.client-ip=68.232.153.233 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="riRz4F3w" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1769526376; x=1801062376; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=OrchZcNzVkiRDk/IccOTw5EqSHvJfTxEqYaQxnqjGaw=; b=riRz4F3wQ1i9bxaY1mVTvhaJN8300Dfdmcds0BHXXa890e8s2TAFhgcD 5NA9skuDai8kQ7/l+gaSV27kOo9DHkDm1Bmj3zyT3gxD7iboG1r5SSxZe Bu1OI/794ZhTkDYfbGhNShgo+TMM9j6m6kipteudJMqVE2ClHkDf4lVcj HX5lDHOvjmM4onNA/Rdic6+/Wl8bLloAeABQ+rjtA3+i7NHcWoGVQyods bdFwyL/VhPMjGNDns2z6WyRBFmEsZo1IsslxTsgn95SXhHYW0eJCoopeL eFrpTY2zmpOz8nHpYGcauB3jgFbuL5KuNxo0zRIDhrsqmFxVFwLqIED1T w==; X-CSE-ConnectionGUID: mCDvqQknTPaf/R6aKUQh/g== X-CSE-MsgGUID: Jn4RnEzqQHy6GcXn7t1E5w== X-IronPort-AV: E=Sophos;i="6.21,257,1763449200"; d="scan'208";a="59619822" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa1.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jan 2026 08:06:15 -0700 Received: from chn-vm-ex01.mchp-main.com (10.10.87.71) by chn-vm-ex3.mchp-main.com (10.10.87.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.2562.29; Tue, 27 Jan 2026 08:05:34 -0700 Received: from marius-VM.mshome.net (10.10.85.11) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server id 15.1.2507.58 via Frontend Transport; Tue, 27 Jan 2026 08:05:32 -0700 From: Marius Cristea Date: Tue, 27 Jan 2026 17:05:24 +0200 Subject: [PATCH v4 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: <20260127-hw_mon-emc1812-v4-1-6bf636b54847@microchip.com> References: <20260127-hw_mon-emc1812-v4-0-6bf636b54847@microchip.com> In-Reply-To: <20260127-hw_mon-emc1812-v4-0-6bf636b54847@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=6877; i=marius.cristea@microchip.com; h=from:subject:message-id; bh=OrchZcNzVkiRDk/IccOTw5EqSHvJfTxEqYaQxnqjGaw=; b=owGbwMvMwCW2tbSTZa7u0x2Mp9WSGDIrrlh8nGC9tOOB45XjpzhzE5i0wvbdPehceCf3rWhU5 clDV71XdZSyMIhxMciKKbKseOunVrX2w2UlsUwdmDmsTCBDGLg4BWAia0wZGU6svZ70LSuzRihe 9wnbX509BrVyewyPfuAoTWdsvBtflsPIsPL848cdleqvfr9TF9z4aqrizY9XInwZgrekJ38+l2r ewwcA 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 supports anti parallel diode. EMC1815 has four external remote temperature monitoring channels and channels 1/2 and 3/4 supports anti parallel diode. EMC1833 has two external remote temperature monitoring channels and channels 1 and 2 supports anti parallel diode. Signed-off-by: Marius Cristea Reviewed-by: Conor Dooley --- .../bindings/hwmon/microchip,emc1812.yaml | 182 +++++++++++++++++= ++++ MAINTAINERS | 6 + 2 files changed, 188 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..759e004eafdfc0772e110fe4847= 67eb66a623294 --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/microchip,emc1812.yaml @@ -0,0 +1,182 @@ +# 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 supports anti parallel diode + EMC1815 has four external remote temperature monitoring channels and + channels 1/2 and 3/4 supports anti parallel diode + EMC1833 has two external remote temperature monitoring channels and + channels 1 and 2 supports 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] + + "#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 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]$": + description: + Represents the external temperature channels to which + a remote diode is connected. + type: object + + properties: + reg: + items: + minimum: 1 + maximum: 4 + + label: + description: Unique name to identify which channel this is. + + required: + - reg + + additionalProperties: false + +required: + - compatible + - reg + - vdd-supply + +allOf: + - if: + properties: + compatible: + contains: + enum: + - microchip,emc1812 + - microchip,emc1813 + - microchip,emc1833 + then: + properties: + microchip,parasitic-res-on-channel3-4: false + - if: + properties: + compatible: + contains: + enum: + - microchip,emc1812 + then: + properties: + channel@1: + properties: + reg: + items: + const: 1 + patternProperties: + "^channel@[2-4]$": 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 =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