From patchwork Sat Jul 3 17:34:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 12357085 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-23.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 96874C07E97 for ; Sat, 3 Jul 2021 17:37:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 682E861934 for ; Sat, 3 Jul 2021 17:37:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229732AbhGCRjg (ORCPT ); Sat, 3 Jul 2021 13:39:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57550 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229613AbhGCRjf (ORCPT ); Sat, 3 Jul 2021 13:39:35 -0400 Received: from mail-lj1-x22f.google.com (mail-lj1-x22f.google.com [IPv6:2a00:1450:4864:20::22f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6E11BC061762 for ; Sat, 3 Jul 2021 10:37:01 -0700 (PDT) Received: by mail-lj1-x22f.google.com with SMTP id u20so18127519ljo.12 for ; Sat, 03 Jul 2021 10:37:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=3/wv+TFcotobDhEtS8rWg6Z26WEl2LawwW76VsOFomQ=; b=CrCfL+Tbr58valehPb0t0SWI1DRhi7efBslrwr6Olb5ygLf+Jtp+IqeidGtMbifgM0 c13ML5+QjnM0zLd+bUJ1rRf18BvuSPU1IW1DexuzpvZuvA03GeuTAcnuXs/ddfe4iciW NwH1MNDjNxxfaImktK6Hdfdyb2iwfZCaBiiBdFFrV27z9KsCO7bof8ikSRg3hp37V7S7 wlGqRO9FGcT5Gg42sh4X+aZefybyX3BtUNcj+yxQPJSipz+T5wwZvuAuh+vsoQeRFag+ 8OYEkGZNJzniErt4XBeR5q/djdfHXzEzWJNvnuDRkof1MQVLQi2AByZWPe0KY6alpx4H 8tBA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=3/wv+TFcotobDhEtS8rWg6Z26WEl2LawwW76VsOFomQ=; b=ldA8FX7571RAN1dNZz1Cy+kqlw1oH1XM99wCLvtQBuMbHJfZcY+eCGKwC04UfTbrQW zAPF8vehtjbxN4zFp7k1cjiwDk42yZKAiLU2x09Vt9DfM7PeHcsefWxh35znRzKfbm8o kYo4h7pwyEVfFINFdoBhJw/JZYMt7BUJDv3ODLTq2MCVZVSmfjCOGCYcnVKSdOKqneF4 NRvnGACIOsU58uDw3uMqfVc5V5SGyfUp8Fi33tjjly6xPZLRuh+n0WOyfJqzqjND+Uis Tv9LdEZpbSj3xh4fMm18Y1aO39OcwcBFA0U2vXCEhp1/29U/YdMpXgOAHtrxpVRCGGG6 ODAg== X-Gm-Message-State: AOAM533aDkbpMgD0qXQoyF5jNpFSz7YSZlcLaJeqgmsUKuzOxq7OmNj9 hPtjAzKxnc9f/bwLXgVfDxm14Q== X-Google-Smtp-Source: ABdhPJxB+tC21k3LQrjWnktbbanGbW8sQM4BYgl54Pn01so877tG4Hh68tDwgzGAWVGn2qo7+oZFbA== X-Received: by 2002:a2e:9e8e:: with SMTP id f14mr4244839ljk.468.1625333819552; Sat, 03 Jul 2021 10:36:59 -0700 (PDT) Received: from localhost.localdomain (c-fdcc225c.014-348-6c756e10.bbcust.telenor.se. [92.34.204.253]) by smtp.gmail.com with ESMTPSA id p18sm751166ljj.56.2021.07.03.10.36.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 03 Jul 2021 10:36:59 -0700 (PDT) From: Linus Walleij To: Jean Delvare , Guenter Roeck Cc: linux-hwmon@vger.kernel.org, Linus Walleij , Javier Martinez Canillas , Johannes Pointner , Peter Rosin , Jonathan Cameron , devicetree@vger.kernel.org Subject: [PATCH v2] dt-bindings: hwmon: Convert NTC thermistor to YAML Date: Sat, 3 Jul 2021 19:34:56 +0200 Message-Id: <20210703173456.4002549-1-linus.walleij@linaro.org> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org This converts the NTC thermistor DT bindings to YAML. Some care had to be taken since I had to add some illustrations to make the connection layouts graspable. Cc: Javier Martinez Canillas Cc: Johannes Pointner Cc: Peter Rosin Cc: Jonathan Cameron Cc: devicetree@vger.kernel.org Signed-off-by: Linus Walleij --- ChangeLog v1->v2: - Realize I need to CC devicetree@vger.kernel.org on this. - Fix Javier's mail address. - Drop Naveen's mail (bouncing) --- .../bindings/hwmon/ntc-thermistor.yaml | 142 ++++++++++++++++++ .../bindings/hwmon/ntc_thermistor.txt | 44 ------ 2 files changed, 142 insertions(+), 44 deletions(-) create mode 100644 Documentation/devicetree/bindings/hwmon/ntc-thermistor.yaml delete mode 100644 Documentation/devicetree/bindings/hwmon/ntc_thermistor.txt diff --git a/Documentation/devicetree/bindings/hwmon/ntc-thermistor.yaml b/Documentation/devicetree/bindings/hwmon/ntc-thermistor.yaml new file mode 100644 index 000000000000..87589da631c9 --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/ntc-thermistor.yaml @@ -0,0 +1,142 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +--- +$id: http://devicetree.org/schemas/hwmon/ntc-thermistor.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: NTC thermistor temperature sensors + +maintainers: + - Naveen Krishna Chatradhi + - Linus Walleij + +description: | + Thermistors with negative temperature coefficient (NTC) are resistors that + vary in resistance in an often non-linear way in relation to temperature. + The negative temperature coefficient means that the resistance decreases + as the temperature rises. Since the relationship between resistance and + temperature is non-linear, software drivers most often need to use a look + up table and interpolation to get from resistance to temperature. + + When used in practice, a thermistor is often connected between ground, a + pull-up resistor or/and a pull-down resistor and a fixed voltage like this: + + + e.g. 5V = pull-up voltage (puv) + | + +-+ + | | + | | Pull-up resistor + | | (puo) + +-+ + |-------------------------o + +-+ | ^ + | |/ | + | / | + |/| Thermistor | Measured voltage (mv) + / | | "connected ground" + /| | | + +-+ | + |-------------------------o + +-+ ^ + | | | + | | Pull-down resistor | Measured voltage (mv) + | | (pdo) | "connected positive" + +-+ | + | | + | v + + GND GND + + The arrangements of where we measure the voltage over the thermistor are + called "connected ground" and "connected positive" and shall be understood as + the cases when either pull-up or pull-down resistance is zero. + + If the pull-up resistance is 0 one end of the thermistor is connected to the + positive voltage and we get the thermistor on top of a pull-down resistor + and we take the measure between the thermistor and the pull-down resistor. + + Conversely if the pull-down resistance is zero, one end of the thermistor is + connected to ground and we get the thermistor under the pull-up resistor + and we take the measure between the pull-up resistor and the thermistor. + + We can use both pull-up and pull-down resistors at the same time, and then + the figure illustrates where the voltage will be measured for the "connected + ground" and "connected positive" cases. + +properties: + $nodename: + pattern: "^thermistor(.*)?$" + + compatible: + oneOf: + - const: epcos,b57330v2103 + - const: epcos,b57891s0103 + - const: murata,ncp15wb473 + - const: murata,ncp18wb473 + - const: murata,ncp21wb473 + - const: murata,ncp03wb473 + - const: murata,ncp15wl333 + - const: murata,ncp03wf104 + - const: murata,ncp15xh103 + # Deprecated "ntp," compatible strings + - const: ntc,ncp15wb473 + deprecated: true + - const: ntc,ncp18wb473 + deprecated: true + - const: ntc,ncp21wb473 + deprecated: true + - const: ntc,ncp03wb473 + deprecated: true + - const: ntc,ncp15wl333 + deprecated: true + + # See /schemas/thermal/thermal-sensor.yaml for details + "#thermal-sensor-cells": + description: Thermal sensor cells if used for thermal sensoring. + const: 0 + + pullup-uv: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Pull-up voltage in micro volts. Must always be specified. + + pullup-ohm: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Pull-up resistance in ohms. Must always be specified, even + if zero. + + pulldown-ohm: + $ref: /schemas/types.yaml#/definitions/uint32 + description: Pull-down resistance in ohms. Must always be specified, even + if zero. + + connected-positive: + $ref: /schemas/types.yaml#/definitions/flag + description: Indicates how the thermistor is connected in series with + a pull-up and/or a pull-down resistor. See the description above for + an illustration. If this flag is NOT specified, the thermistor is assumed + to be connected-ground, which usually means a pull-down resistance of + zero but complex arrangements are possible. + + # See /schemas/iio/adc/adc.yaml + io-channels: + maxItems: 1 + description: IIO ADC channel to read the voltage over the resistor. Must + always be specified. + +required: + - compatible + - pullup-uv + - pullup-ohm + - pulldown-ohm + - io-channels + +additionalProperties: false + +examples: + - | + thermistor0 { + compatible = "murata,ncp18wb473"; + io-channels = <&gpadc 0x06>; + pullup-uv = <1800000>; + pullup-ohm = <220000>; + pulldown-ohm = <0>; + #thermal-sensor-cells = <0>; + }; diff --git a/Documentation/devicetree/bindings/hwmon/ntc_thermistor.txt b/Documentation/devicetree/bindings/hwmon/ntc_thermistor.txt deleted file mode 100644 index 4c5c3712970e..000000000000 --- a/Documentation/devicetree/bindings/hwmon/ntc_thermistor.txt +++ /dev/null @@ -1,44 +0,0 @@ -NTC Thermistor hwmon sensors -------------------------------- - -Requires node properties: -- "compatible" value : one of - "epcos,b57330v2103" - "epcos,b57891s0103" - "murata,ncp15wb473" - "murata,ncp18wb473" - "murata,ncp21wb473" - "murata,ncp03wb473" - "murata,ncp15wl333" - "murata,ncp03wf104" - "murata,ncp15xh103" - -/* Usage of vendor name "ntc" is deprecated */ - "ntc,ncp15wb473" - "ntc,ncp18wb473" - "ntc,ncp21wb473" - "ntc,ncp03wb473" - "ntc,ncp15wl333" - -- "pullup-uv" Pull up voltage in micro volts -- "pullup-ohm" Pull up resistor value in ohms -- "pulldown-ohm" Pull down resistor value in ohms -- "connected-positive" Always ON, If not specified. - Status change is possible. -- "io-channels" Channel node of ADC to be used for - conversion. - -Optional node properties: -- "#thermal-sensor-cells" Used to expose itself to thermal fw. - -Read more about iio bindings at - https://github.com/devicetree-org/dt-schema/blob/master/schemas/iio/ - -Example: - ncp15wb473@0 { - compatible = "murata,ncp15wb473"; - pullup-uv = <1800000>; - pullup-ohm = <47000>; - pulldown-ohm = <0>; - io-channels = <&adc 3>; - };