Received: by 2002:ab2:2997:0:b0:1ec:cbc4:63fb with SMTP id n23csp559858lqb; Thu, 29 Feb 2024 08:29:31 -0800 (PST) X-Forwarded-Encrypted: i=3; AJvYcCX4vMRP07oYmfg9c62jDAq6mZQPqACoY6bQr8la280QKl3oBsn7QC//7VsFm1yU+SPWWmvvxDZtohWSYui4RSIV+ydGykVR9WTcwltnCw== X-Google-Smtp-Source: AGHT+IGJiWjS+jsUFoVX1hRu48CEfriuRyKQ2JBUz70qn0QZyh2jsixajjHpiRHJXiC0Y55l7lOC X-Received: by 2002:a17:906:410b:b0:a44:405b:1e17 with SMTP id j11-20020a170906410b00b00a44405b1e17mr1498052ejk.34.1709224171793; Thu, 29 Feb 2024 08:29:31 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1709224171; cv=pass; d=google.com; s=arc-20160816; b=LgZ5jNQkgzJxd7JzOoyM6hEa6gr604uL/DzdXJvTv/IuoLflZ6fQPbmQyNiYsV9pEw 86+21Mt4VvhoKm2fId4eYzmrvVgajCADUWgbbh7nRQvSoXj+dgjMKw8z18RH+0CMNov4 71A0ikSJdzjF1l/qQAka2+UI6CgONXqxzy/jAxP+rz1pfC/zkcCC2HMJRtCGO8cpQEnO synsO0h+AL6m8pO/LJT9cnSYYu9UyMopNfkhGdyidXCQJ0tuHbxw6vM4grQ9r6IcRcOS qe9um3Nqjq3Eg5+b5YsutFg8VA8z2PNv6q5ntRVAOHhpj5aS5amno9PRq6r50syio/8l 3BdQ== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:references:in-reply-to:message-id :date:subject:cc:to:from:dkim-signature; bh=zyeJ0S5eZ1Ip9FdHAJqFfAVsj9O19TjIa67eDz6jhpk=; fh=otYMlFYTctWK/RfQ9jjBi33igsoKLpS/Sk/gz0UZUmk=; b=rjao/tsYnh0UjJ6r5z3ksy1wwBELu/htAUvnM4HKqmHonTOeejlGYUMagD3HvIy7JY U4xXIXeuj0D/Ug10XaVGU8Tw53CyWozQSlx/66F8jgpNc/0ApQOXOfzdES0WUF+rXZ8J 8vEXv2qevW07hYOEJgfP6npBiYaRFQUXHzjLuwOoAvu//vQikxQJTE3pi53FFeYQCCIX EtsBecxf6VSCnQ+ehehp3m0pKLerFHQHqbX4GG/JMwDSXU7hibtbQefSRsf/YWKeKHyE ss3LFDAgD2rx5NX2ii8MQ0GJ05bKv/QhMwJamlPbkmyrrBSdM0BFpQmU8bAwX00maowD ICvg==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@baylibre-com.20230601.gappssmtp.com header.s=20230601 header.b="o/UYpIlU"; arc=pass (i=1 spf=pass spfdomain=baylibre.com dkim=pass dkdomain=baylibre-com.20230601.gappssmtp.com); spf=pass (google.com: domain of linux-kernel+bounces-87077-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) smtp.mailfrom="linux-kernel+bounces-87077-linux.lists.archive=gmail.com@vger.kernel.org" Return-Path: Received: from am.mirrors.kernel.org (am.mirrors.kernel.org. [147.75.80.249]) by mx.google.com with ESMTPS id s10-20020a170906c30a00b00a42f801c4b4si699599ejz.359.2024.02.29.08.29.31 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Feb 2024 08:29:31 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-87077-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249; Authentication-Results: mx.google.com; dkim=pass header.i=@baylibre-com.20230601.gappssmtp.com header.s=20230601 header.b="o/UYpIlU"; arc=pass (i=1 spf=pass spfdomain=baylibre.com dkim=pass dkdomain=baylibre-com.20230601.gappssmtp.com); spf=pass (google.com: domain of linux-kernel+bounces-87077-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) smtp.mailfrom="linux-kernel+bounces-87077-linux.lists.archive=gmail.com@vger.kernel.org" Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by am.mirrors.kernel.org (Postfix) with ESMTPS id 5C4471F26B08 for ; Thu, 29 Feb 2024 16:29:31 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 8F9817829E; Thu, 29 Feb 2024 16:26:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=baylibre-com.20230601.gappssmtp.com header.i=@baylibre-com.20230601.gappssmtp.com header.b="o/UYpIlU" Received: from mail-ot1-f47.google.com (mail-ot1-f47.google.com [209.85.210.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2BC0A6CC09 for ; Thu, 29 Feb 2024 16:26:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.47 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709223985; cv=none; b=jHBtflnAuRQRzHN32wg/RXsOISjaQuFvX3UPZ9h1B11kxSHcnJQHtAdgNoqJhr8cXrT3ORCmkqbtwu70Rh22DwlpJC/U7INHl1IlsvJ9YS0jYSKGPTtRaeEV+HAT3n+pnWCFpErBYty8UWpqAYPzGWxABeoxHUCPVEQjFvrF6p4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709223985; c=relaxed/simple; bh=V7DMoKtSD+BJk/1Ejz/oYHXPZbzT+1YK71Q6ukq5S2U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=fueoXYd+Do7x5dNtyFMOHAW0enfaE5L+FjKLr1Bk/T5jHR0C/MCBWguHsVFeRMA35/hii+j+zrPp03AZdBXKI1QtN26HtKMpD0fjbyo80VRsjFq8dxMBHCAbpUDdaTakh5O1yRc6/SxeQayLfM4qWgPC4oPB3UMp5aF5rD3GWAs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com; spf=pass smtp.mailfrom=baylibre.com; dkim=pass (2048-bit key) header.d=baylibre-com.20230601.gappssmtp.com header.i=@baylibre-com.20230601.gappssmtp.com header.b=o/UYpIlU; arc=none smtp.client-ip=209.85.210.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=baylibre.com Received: by mail-ot1-f47.google.com with SMTP id 46e09a7af769-6e497a1481cso485043a34.0 for ; Thu, 29 Feb 2024 08:26:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20230601.gappssmtp.com; s=20230601; t=1709223982; x=1709828782; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=zyeJ0S5eZ1Ip9FdHAJqFfAVsj9O19TjIa67eDz6jhpk=; b=o/UYpIlUXJEMxeoEJpMMBpUwylUI3SIk1HILyvWXG1jfl75tADcaKtMhnbvrA7NuRG ZKKmkKHs/pTX+VmuK4rXestwrM0jnUbd4HxCg+TnZnqS1W54b688z5VNDW9KeBgLRZ2p 73/0uAKVMc622SwM27vVit0o5rHcrU6vVkNu6wrl5r7/ACPaodTMbFAML/MbVyPDxcUD Iu/B2xYcRSBJnncj0l67/E1DGaN1tXRxkRROmNE7TdTEUzGDFaTrCDTKREUO60HXo80x zglLfmweqmmUU6Ph2c2R9tp9Y+b6vKvTmwkzFwDupZ2UWoOpY8SrL4r4dFGmZsmMbm0s OeOw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1709223982; x=1709828782; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=zyeJ0S5eZ1Ip9FdHAJqFfAVsj9O19TjIa67eDz6jhpk=; b=Bb7FvqAtg09VF4LQ1UPbqQSRN+eMUFWnZW1n1S4JdJVeiOxhS6BrMORidWd6/3oynV A7fH3xP7vCrW034REKXN90flfkwbAlGJjc9a9jdIFmGWEvj20r59VtGwRXfZY1Zv9aVd zCZ4dvS0oV0ZhqSew1TdmNjs5msZeC5kEa+86nR+t6/S8dArIvJfgNsJ72ffLp24GIj0 tb6hR3ZqsFMvoEn1LEpIhayiGeNidSygbvX5Pv/QAA+KLV21DVihDtfu6BU548wiwamy kFs3V1WTS1PAN0L25CdfW38SLK1GDnhRakyTl/b4GPxthcev7R01CclgTHWSXgCAOtaO UqmQ== X-Forwarded-Encrypted: i=1; AJvYcCUmDrOYD+ziz7q6wXv/3ofNEPmdV8V5eif+lw2bNJm4Iai86tjtCGY+vqJVmAbXv29OWVlqEc+9ONHSbZrF3kQOfV3ooiN8/rDQJiGG X-Gm-Message-State: AOJu0YyU8BZYdSWm04CyTSwmyzMZ1dG+e1CrB3VHOfi3mdDgpp4KIzf8 ml+AFXWY5YoV5WccP5bL2cAQFaE3sryh+C/fF2Gqzdfg8ny7XURwIA2kDmvt/tg= X-Received: by 2002:a05:6830:14c3:b0:6e2:e92e:4d6 with SMTP id t3-20020a05683014c300b006e2e92e04d6mr2526260otq.4.1709223982209; Thu, 29 Feb 2024 08:26:22 -0800 (PST) Received: from freyr.lechnology.com (ip98-183-112-25.ok.ok.cox.net. [98.183.112.25]) by smtp.gmail.com with ESMTPSA id b7-20020a9d4787000000b006e4ab46ede1sm325141otf.2.2024.02.29.08.26.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Feb 2024 08:26:21 -0800 (PST) From: David Lechner To: linux-iio@vger.kernel.org Cc: David Lechner , Michael Hennerich , Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley , =?utf-8?q?Nuno_S=C3=A1?= , Liam Girdwood , Mark Brown , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 1/2] dt-bindings: iio: adc: add ad7944 ADCs Date: Thu, 29 Feb 2024 10:25:50 -0600 Message-ID: <20240229-ad7944-mainline-v4-1-f88b5ec4baed@baylibre.com> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240229-ad7944-mainline-v4-0-f88b5ec4baed@baylibre.com> References: <20240229-ad7944-mainline-v4-0-f88b5ec4baed@baylibre.com> 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" X-Mailer: b4 0.12.4 Content-Transfer-Encoding: 8bit This adds a new binding for the Analog Devices, Inc. AD7944, AD7985, and AD7986 ADCs. Signed-off-by: David Lechner --- v4 changes: - Fixed broken patch due to misplaced changelog v3 changes: - Removed default 'multi' value from adi,spi-mode property. This simplifies things a bit by not having to check for two possible conditions (absence of property or explicit default value). Now, only absence of property is valid to indicate the default mode. Constraints that depend on this property are updated accordingly. - Fixed spelling of 'conventional'. - Expanded description to call out potential confusion of '3-wire' mode being unrelated to the standard spi-3wire property. - Added standard '#daisy-chained-devices' property for chain mode. - Relaxed requirement of cnv-gpios since it was determined that an active high CS could actually be used in chain mode. --- .../devicetree/bindings/iio/adc/adi,ad7944.yaml | 213 +++++++++++++++++++++ MAINTAINERS | 8 + 2 files changed, 221 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml new file mode 100644 index 000000000000..2564ef4f58cc --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml @@ -0,0 +1,213 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/adi,ad7944.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices PulSAR LFCSP Analog to Digital Converters + +maintainers: + - Michael Hennerich + - Nuno Sá + +description: | + A family of pin-compatible single channel differential analog to digital + converters with SPI support in a LFCSP package. + + * https://www.analog.com/en/products/ad7944.html + * https://www.analog.com/en/products/ad7985.html + * https://www.analog.com/en/products/ad7986.html + +$ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + enum: + - adi,ad7944 + - adi,ad7985 + - adi,ad7986 + + reg: + maxItems: 1 + + spi-max-frequency: + maximum: 111111111 + + spi-cpol: true + spi-cpha: true + + adi,spi-mode: + $ref: /schemas/types.yaml#/definitions/string + enum: [ single, chain ] + description: | + This property indicates the SPI wiring configuration. + + When this property is omitted, it is assumed that the device is using what + the he datasheet calls "4-wire mode". This is the conventional SPI mode + used when there are multiple devices on the same bus. In this mode, the + CNV line is used to initiate the conversion and the SDI line is connected + to CS on the SPI controller. + + When this property is present, it indicates that the device is using one + of the following alternative wiring configurations: + + * single: The datasheet calls this "3-wire mode". (NOTE: The datasheet's + definition of 3-wire mode is NOT at all related to the standard + spi-3wire property!) This mode is often used when the ADC is the only + device on the bus. In this mode, SDI is tied to VIO, and the CNV line + can be connected to the CS line of the SPI controller or to a GPIO, in + which case the CS line of the controller is unused. + * chain: The datasheet calls this "chain mode". This mode is used to save + on wiring when multiple ADCs are used. In this mode, the SDI line of + one chip is tied to the SDO of the next chip in the chain and the SDI of + the last chip in the chain is tied to GND. Only the first chip in the + chain is connected to the SPI bus. The CNV line of all chips are tied + together. The CS line of the SPI controller can be used as the CNV line + only if it is active high. + + '#daisy-chained-devices': true + + avdd-supply: + description: A 2.5V supply that powers the analog circuitry. + + dvdd-supply: + description: A 2.5V supply that powers the digital circuitry. + + vio-supply: + description: + A 1.8V to 2.7V supply for the digital inputs and outputs. + + bvdd-supply: + description: + A voltage supply for the buffered power. When using an external reference + without an internal buffer (PDREF high, REFIN low), this should be + connected to the same supply as ref-supply. Otherwise, when using an + internal reference or an external reference with an internal buffer, this + is connected to a 5V supply. + + ref-supply: + description: + Voltage regulator for the external reference voltage (REF). This property + is omitted when using an internal reference. + + refin-supply: + description: + Voltage regulator for the reference buffer input (REFIN). When using an + external buffer with internal reference, this should be connected to a + 1.2V external reference voltage supply. Otherwise, this property is + omitted. + + cnv-gpios: + description: + The Convert Input (CNV). This input has multiple functions. It initiates + the conversions and selects the SPI mode of the device (chain or CS). In + 'single' mode, this property is omitted if the CNV pin is connected to the + CS line of the SPI controller. + maxItems: 1 + + turbo-gpios: + description: + GPIO connected to the TURBO line. If omitted, it is assumed that the TURBO + line is hard-wired and the state is determined by the adi,always-turbo + property. + maxItems: 1 + + adi,always-turbo: + type: boolean + description: + When present, this property indicates that the TURBO line is hard-wired + and the state is always high. If neither this property nor turbo-gpios is + present, the TURBO line is assumed to be hard-wired and the state is + always low. + + interrupts: + description: + The SDO pin can also function as a busy indicator. This node should be + connected to an interrupt that is triggered when the SDO line goes low + while the SDI line is high and the CNV line is low ('single' mode) or the + SDI line is low and the CNV line is high ('multi' mode); or when the SDO + line goes high while the SDI and CNV lines are high (chain mode), + maxItems: 1 + +required: + - compatible + - reg + - avdd-supply + - dvdd-supply + - vio-supply + - bvdd-supply + +allOf: + # ref-supply and refin-supply are mutually exclusive (neither is also valid) + - if: + required: + - ref-supply + then: + properties: + refin-supply: false + - if: + required: + - refin-supply + then: + properties: + ref-supply: false + # in '4-wire' mode, cnv-gpios is required, for other modes it is optional + - if: + not: + required: + - adi,spi-mode + then: + required: + - cnv-gpios + # chain mode has lower SCLK max rate and doesn't work when TURBO is enabled + - if: + required: + - adi,spi-mode + properties: + adi,spi-mode: + const: chain + then: + properties: + spi-max-frequency: + maximum: 90909090 + adi,always-turbo: false + required: + - '#daisy-chained-devices' + else: + properties: + '#daisy-chained-devices': false + # turbo-gpios and adi,always-turbo are mutually exclusive + - if: + required: + - turbo-gpios + then: + properties: + adi,always-turbo: false + - if: + required: + - adi,always-turbo + then: + properties: + turbo-gpios: false + +unevaluatedProperties: false + +examples: + - | + #include + spi { + #address-cells = <1>; + #size-cells = <0>; + adc@0 { + compatible = "adi,ad7944"; + reg = <0>; + spi-cpha; + spi-max-frequency = <111111111>; + avdd-supply = <&supply_2_5V>; + dvdd-supply = <&supply_2_5V>; + vio-supply = <&supply_1_8V>; + bvdd-supply = <&supply_5V>; + cnv-gpios = <&gpio 0 GPIO_ACTIVE_HIGH>; + turbo-gpios = <&gpio 1 GPIO_ACTIVE_HIGH>; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 2662ec49b297..35f27504632d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -441,6 +441,14 @@ W: http://wiki.analog.com/AD7879 W: https://ez.analog.com/linux-software-drivers F: drivers/input/touchscreen/ad7879.c +AD7944 ADC DRIVER (AD7944/AD7985/AD7986) +M: Michael Hennerich +M: Nuno Sá +R: David Lechner +S: Supported +W: https://ez.analog.com/linux-software-drivers +F: Documentation/devicetree/bindings/iio/adc/adi,ad7944.yaml + ADAFRUIT MINI I2C GAMEPAD M: Anshul Dalal L: linux-input@vger.kernel.org -- 2.43.2