From patchwork Fri Sep 22 11:14:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matti Vaittinen X-Patchwork-Id: 14376 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:612c:172:b0:3f2:4152:657d with SMTP id h50csp5572618vqi; Fri, 22 Sep 2023 06:27:14 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEnEqxcT0XB/+nzMnOCWGNvmz5lJ6ZuuH4PvoK3s6nJxhcyGTSlunuQnjmavXNy0HHnp4XN X-Received: by 2002:a17:90a:6e44:b0:26d:412d:9ce8 with SMTP id s4-20020a17090a6e4400b0026d412d9ce8mr7915626pjm.0.1695389234402; Fri, 22 Sep 2023 06:27:14 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1695389234; cv=none; d=google.com; s=arc-20160816; b=KiLufs4STXcNbjAumknSvV6wQdm3AZyYIs+vJ8fXC0dao9zLZJUgAF6BnPNtozTHpq oi1wCXPADR0NBtuN8QQELLN+a4owYqofqutwXNXVtc7BoaTVOheRhvycQplzhXoZlKq0 KpOite1XfOHAYfZb/K0QxTXi6upYGKPkW5oHHkGp8TVS3S2h9QGwdahp8NJNrBd3koF9 3+nwclY1e9Y+8yTiVFBx+Snk2qYn2oWAOLNqg3YLm8MdBjeaTEyQlyjTJAaMEVbrjPoU cgYW7AaqUt3xqrGQrjfvAgr3b2kQqcKlCiddFe+6AIWiG7q0LWvM+xffFKlVWTPEUN/x OTsA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-disposition:mime-version:message-id :subject:cc:to:from:date:dkim-signature; bh=12f5yyT0VcPpXHLkpH7MFmQ/cCt4mwm5CuEcr3HwBqw=; fh=+XkJcXOKJ4Dl6AYTln3UzvhZHjSiM5yCnDKdoCP8e7U=; b=m+PwSL4VlUpYz/ho8vfcqo/QxUIQjjcN5P+k2sZGqatdiu512Cy7OuLhVqaN3d7+8/ /DkeOmFpXf9aJnsXdIJhDUG5GSuaMlJSavul4JGf90oyZJNDKO1wdALs/x7vtTS+9m4r ZGBKyRpXX6tuDS2Hi3tILX54eYOEnbsul6Zgb4848EybSjOBHADTPDHuKWHP2sL9SF5Y iRWHQsiTFo27FJEiktN2IqqDQ5qaLqNHsb74PeqpV68ZzBMiBzmzza1wMziWfEhAbZpD P8UKcwp3QyyGrXlmVJcZqyfUdJ7jKTUv3GCOKtFe5nuLcCUZxG1jVAlWsOGgeOHM528s JDFQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=HCd2tLAm; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.32 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from agentk.vger.email (agentk.vger.email. [23.128.96.32]) by mx.google.com with ESMTPS id ge13-20020a17090b0e0d00b00276671731e3si6183723pjb.136.2023.09.22.06.27.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Sep 2023 06:27:14 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.32 as permitted sender) client-ip=23.128.96.32; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=HCd2tLAm; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.32 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by agentk.vger.email (Postfix) with ESMTP id B137D80E9E8C; Fri, 22 Sep 2023 04:15:48 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at agentk.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233578AbjIVLPN (ORCPT + 30 others); Fri, 22 Sep 2023 07:15:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233534AbjIVLPM (ORCPT ); Fri, 22 Sep 2023 07:15:12 -0400 Received: from mail-lf1-x12f.google.com (mail-lf1-x12f.google.com [IPv6:2a00:1450:4864:20::12f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B6D1AF; Fri, 22 Sep 2023 04:15:06 -0700 (PDT) Received: by mail-lf1-x12f.google.com with SMTP id 2adb3069b0e04-5043120ffbcso2420894e87.2; Fri, 22 Sep 2023 04:15:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1695381304; x=1695986104; darn=vger.kernel.org; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :from:to:cc:subject:date:message-id:reply-to; bh=12f5yyT0VcPpXHLkpH7MFmQ/cCt4mwm5CuEcr3HwBqw=; b=HCd2tLAm3gJbK09WMZivh7k3m9MrWocOE2xYG9S3LiIWV/xoMHdDTQYk72ioIvso98 YXHh02qNOI8ALYZgbvwkbiOB4b4dC7qLZCA3Qjn30vZ/HheyjvwtatgUdXto7vf23WTb wV9LmgppYzT06cMcpMFuWoRhe8EqYzeCaXaaK2Lezkqe125yh36veH905bQo8i7K1yED lhfJe4XiwSJzF6NpUUBw6hzR7JS9OS1tjXwTddlj4r/BfIE2KeGmRnFI7Sh/IXu6lMcz jh5xyCt8fpkupC4P0kiR4mFYshUbmCkqLrdYb2JmIPYCc++fqAXwlKlOpaZW1qPkHgf9 zoIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695381304; x=1695986104; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=12f5yyT0VcPpXHLkpH7MFmQ/cCt4mwm5CuEcr3HwBqw=; b=Xq16ot0VQXtJQaBovYEt1rA1xonZjLD3iQ1bTXoI0HB4FidpXBFSR1zBJ8xpRXpFK5 2UEb3V3jJj9BNb9m3WIuGKGoaA+CjVluIFQPy21pP1dUoncZCnsHFnM7TgEMrXu1W43q FfucecRYi7+l3CNgtsYsqBPmAAUBXs24HDB0/ZdsBs3YoI6YcCNqx08FgnW4W3vAEwDT KtDDNvAvMRI5Hx444JdLCgw86pVVWqooJqKFnKt83rv96lfOgNEifYj+dkGzoCnASq0r N8/WdnpUTs8auof20JtHTJsjBlzp+IbtUlESa4w2yxhQJcfpgkxA9+4/Rm25CCUNholo L3fQ== X-Gm-Message-State: AOJu0Yxsohpj/JXsHX46CWdPv1nZy3SfjZkztAVrTY4HijRKGYxz/727 dIFgJFzeHhn1zyBc5uwdDos= X-Received: by 2002:a19:8c14:0:b0:500:ac10:1641 with SMTP id o20-20020a198c14000000b00500ac101641mr7174543lfd.46.1695381301847; Fri, 22 Sep 2023 04:15:01 -0700 (PDT) Received: from dc78bmyyyyyyyyyyyyyyt-3.rev.dnainternet.fi (dc78bmyyyyyyyyyyyyyyt-3.rev.dnainternet.fi. [2001:14ba:16f8:1500::1]) by smtp.gmail.com with ESMTPSA id c11-20020a19760b000000b0050338c5c1f3sm690352lff.14.2023.09.22.04.14.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Sep 2023 04:15:00 -0700 (PDT) Date: Fri, 22 Sep 2023 14:14:52 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Jonathan Cameron , Lars-Peter Clausen , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matti Vaittinen , Andy Shevchenko , Angel Iglesias , Andreas Klinger , Christophe JAILLET , Benjamin Bara , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 0/6] Support ROHM BM1390 pressure sensor Message-ID: MIME-Version: 1.0 Content-Disposition: inline X-Spam-Status: No, score=-0.6 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on agentk.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (agentk.vger.email [0.0.0.0]); Fri, 22 Sep 2023 04:15:48 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777744461759781873 X-GMAIL-MSGID: 1777744461759781873 ROHM BM1390 Pressure sensor (BM1390GLV-Z) can measure pressures ranging from 300 hPa to 1300 hPa with configurable measurement averaging and an internal FIFO. The sensor does also provide temperature measurements although, according to the data sheet, sensor performs internal temperature compensation for the MEMS. Sensor does also contain IIR filter implemented in HW. The data-sheet says the IIR filter can be configured to be "weak", "middle" or "strong". Some RMS noise figures are provided in data sheet but no accurate maths for the filter configurations is provided. I actually asked if we can define 3db frequencies corresponding to these IIR filter settings - and I received values 0.452Hz, 0.167Hz, and 0.047Hz but I am not at all sure we understood each others with the HW colleagues... Hence, the IIR filter configuration is not supported by this driver and the filter is just configured to the "middle" setting. (at least for now) It would also be possible to not use IIR filter but just do some simple averaging. I wonder if it would make sense to implement the OVERSAMPLING value setting so that if this value is written, IIR filter is disabled and number of samples to be averaged is set to value requested by OVERSAMPLING. The data-sheet has a mention that if IIR is used, the number of averaged samples must be set to a fixed value. The FIFO measurement mode (in sensor hardware) is only measuring the pressure and not the temperature. The driver measures temperature when FIFO is flushed and simply uses the same measured temperature value to all reported temperatures. This should not be a problem when temperature is not changing very rapidly (several degrees C / second) but allows users to get the temperature measurements from sensor without any additional logic. This driver has received limited amount of testing this far. It's in a state 'works on my machine, for my use cases' - and all feedback is appreciated! Revision history: Major changes here, please see the head room of individual patches for more detailed list. v2 => v3: rebased on v6.6-rc2 added three IIO fixup patches so numbering of patches changed dt-bindings/MAINTAINERS: No changes bm1390 driver: - various cleanups and fixes - do not disable IRQ - fix temperature reading when FIFO is used - separate buffer and trigger initialization v1 => v2: rebased on v6.6-rc1 dt-bindings: - fix compatible in the example sensor driver: - drop unnecessary write_raw callback - plenty of small improvements and fixes MAINTAINERS: - No changes Matti Vaittinen (6): tools: iio: iio_generic_buffer ensure alignment iio: improve doc for available_scan_mask iio: try searching for exact scan_mask dt-bindings: Add ROHM BM1390 pressure sensor iio: pressure: Support ROHM BU1390 MAINTAINERS: Add ROHM BM1390 .../bindings/iio/pressure/rohm,bm1390.yaml | 52 + MAINTAINERS | 6 + drivers/iio/industrialio-buffer.c | 25 +- drivers/iio/pressure/Kconfig | 9 + drivers/iio/pressure/Makefile | 1 + drivers/iio/pressure/rohm-bm1390.c | 930 ++++++++++++++++++ include/linux/iio/iio.h | 4 +- tools/iio/iio_generic_buffer.c | 15 +- 8 files changed, 1034 insertions(+), 8 deletions(-) create mode 100644 Documentation/devicetree/bindings/iio/pressure/rohm,bm1390.yaml create mode 100644 drivers/iio/pressure/rohm-bm1390.c base-commit: ce9ecca0238b140b88f43859b211c9fdfd8e5b70