From mboxrd@z Thu Jan 1 00:00:00 1970 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 9F1C73FB067; Wed, 29 Apr 2026 12:58:15 +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=1777467497; cv=none; b=pbJ0SZWSRCXGlWS14Mmzm7aMm6E5wN1XzvEAojjOPzxl6knYALyxLmlgWIVsO7n5+H8CuoiCa8P8bn4loptL8d0VHNIDJOJmBGi5dMQb8EDGt7yoD+Sar3HBSiUEpJ8nIRLy7t053tD8lsQonqJoiK7XkwEtmThuQOY8zN9sEoM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777467497; c=relaxed/simple; bh=A+/FtmKJA7zPEFw0BF3lSuBrzO/+8y3caLxtBLj3G2I=; h=From:Date:Subject:MIME-Version:Content-Type:Message-ID:References: In-Reply-To:To:CC; b=ooYT3vcRr6oZsRlIHujscy2UrzQVb22xOlOrLdj9Vt+TeYqCpdiV24cyfJx6MGyT5i/7IBOJAe0a67UQivTw35WJjIb3tkB5FzlX1BDu/7VOp7wGrF75rkLyrjtrkuej9yuFHVt5BVhqV0R+T8T2yiVzBgGmmi6ry5B1CKjfbmQ= 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=OvjuYiU+; 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="OvjuYiU+" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1777467494; x=1809003494; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=A+/FtmKJA7zPEFw0BF3lSuBrzO/+8y3caLxtBLj3G2I=; b=OvjuYiU+u+ZJhpsvkFMop3arWS7xUB4IxBHGugedv+ff5ytfwxYNXSp9 u2hijD5BEpslTadsgYi8P8aMyj9WH7QWpLOSaXm06kiCNvbGBkFen4Is6 Fztvs1SJLxL/4HtYdHVRjVQNZdHXqB+FFH28mSTPsgydW/4AwWKpdjUlw 2KtgcYuMmQu7UjugVHcS0TLn7BYXfT59f8GpTZ0XLXhkfExxzfMWm5/P1 FuMSu/ZuMIcvJ4awhe3cMNIu0Pr0pDjnatgAkhWahJmI17CbFgEoIaDEp YpkL7UweF/0IwVAhiy+GpZIOdcM5fQcZBd/pKAIO1FQ7Ereq8Qsj7oaAs A==; X-CSE-ConnectionGUID: WFRDzeUSQcCLSMH8WGlcNA== X-CSE-MsgGUID: dKLabNrPTVewfYE1suTMfA== X-IronPort-AV: E=Sophos;i="6.23,206,1770620400"; d="scan'208";a="56007571" 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; 29 Apr 2026 05:58:14 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.87.72) by chn-vm-ex4.mchp-main.com (10.10.87.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.2562.37; Wed, 29 Apr 2026 05:58:15 -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; Wed, 29 Apr 2026 05:58:12 -0700 From: Marius Cristea Date: Wed, 29 Apr 2026 15:58:07 +0300 Subject: [PATCH v10 1/2] dt-bindings: hwmon: temperature: add support for EMC1812 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <20260429-hw_mon-emc1812-v10-1-a8ca1d779502@microchip.com> References: <20260429-hw_mon-emc1812-v10-0-a8ca1d779502@microchip.com> In-Reply-To: <20260429-hw_mon-emc1812-v10-0-a8ca1d779502@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=7870; i=marius.cristea@microchip.com; h=from:subject:message-id; bh=A+/FtmKJA7zPEFw0BF3lSuBrzO/+8y3caLxtBLj3G2I=; b=owGbwMvMwCW2tbSTZa7u0x2Mp9WSGDI/MSQKTNDXXPB7Ttd3H/7meVdP2/ltOrSCMX5v0BpdU UvZSlmOjlIWBjEuBlkxRZYVb/3UqtZ+uKwklqkDM4eVCWQIAxenAExEqp/hv2v9hV1L1zXbPKrs yjnvVFFu/nDRv9uX5r3aYWvTf7A+YBcjw5tc1TAT861ctxuPTJnv8OHy3K9TUjhfXM1Q+fs31+b iF24A 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. It also updates the MAINTAINERS file to include the new driver. 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. Resistance Error Correction is supported on channels 1/2 and 3/4. Signed-off-by: Marius Cristea --- .../bindings/hwmon/microchip,emc1812.yaml | 193 +++++++++++++++++++++ MAINTAINERS | 6 + 2 files changed, 199 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..1a273621db826db66f0c33b1b2f5c72c0788a6ae --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/microchip,emc1812.yaml @@ -0,0 +1,193 @@ +# 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/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"; + }; + }; + }; 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 +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 -- 2.51.0