From mboxrd@z Thu Jan 1 00:00:00 1970 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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 92828C433DB for ; Thu, 4 Mar 2021 09:32:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5796764F04 for ; Thu, 4 Mar 2021 09:32:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237530AbhCDJcO (ORCPT ); Thu, 4 Mar 2021 04:32:14 -0500 Received: from smtp2.macqel.be ([109.135.2.61]:18164 "EHLO smtp2.macqel.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237532AbhCDJcI (ORCPT ); Thu, 4 Mar 2021 04:32:08 -0500 Received: from localhost (localhost [127.0.0.1]) by smtp2.macqel.be (Postfix) with ESMTP id 48514130D36; Thu, 4 Mar 2021 10:31:21 +0100 (CET) X-Virus-Scanned: amavisd-new at macqel.be Received: from smtp2.macqel.be ([127.0.0.1]) by localhost (mail.macqel.be [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ykgT+V8jnGE1; Thu, 4 Mar 2021 10:31:19 +0100 (CET) Received: from frolo.macqel.be (frolo.macqel [10.1.40.73]) by smtp2.macqel.be (Postfix) with ESMTP id 098CE130CB5; Thu, 4 Mar 2021 10:31:19 +0100 (CET) Received: by frolo.macqel.be (Postfix, from userid 1000) id E7D1EDF009D; Thu, 4 Mar 2021 10:31:18 +0100 (CET) Date: Thu, 4 Mar 2021 10:31:18 +0100 From: Philippe De Muyter To: Jean-Baptiste Maneyrol Cc: "linux-iio@vger.kernel.org" Subject: Re: invensense mpu9250 ak8963 and devicetree Message-ID: <20210304093118.GA29240@frolo.macqel> References: <20210303153145.GA30260@frolo.macqel> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.16 (2007-06-09) Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Hello Jean-Baptiste, thank you for your answer I work actually with a nvidia-provided 4.9 kernel that I cannot change. Up to now I have incorporated the mpu9250 related patches up to v4.12. Do you think I should simply replace the inv_mpu6050 driver files of v4.9 by their v5.11 (or newer) counterparts ? Thanks Philippe On Thu, Mar 04, 2021 at 09:12:47AM +0000, Jean-Baptiste Maneyrol wrote: > Hello Philippe, > > I would recommend letting mpu9250 chip drives the magnetometer instead of using the ak8963 driver. > > This is simpler to use and guarantees a good synchronization between all sensors and no possible latency coming from kernel scheduling when polling the magnetometer. And it enables the use of spi bus for connecting the device. > > You just need to define mpu9250 dts without an i2c-gate, and delete all definition of ak8963 chip. > > Best regards, > JB > > > From: Philippe De Muyter > Sent: Wednesday, March 3, 2021 16:31 > To: linux-iio@vger.kernel.org > Subject: invensense mpu9250 ak8963 and devicetree >   > Hello, > > I am trying to use a mpu9250 imu, but I have trouble with the ak8963 part. > > Currently, ak8975_probe fails in this code : > >         /* Fetch the regulators */ >         data->vdd = devm_regulator_get(&client->dev, "vdd"); >         if (IS_ERR(data->vdd)) >                 return PTR_ERR(data->vdd); >         data->vid = devm_regulator_get(&client->dev, "vid"); >         if (IS_ERR(data->vid)) >                 return PTR_ERR(data->vid); > > but Documentation/devicetree/bindings/iio/magnetometer/asahi-kasei,ak8975.yaml > says : > >   vdd-supply: >     description: | >       an optional regulator that needs to be on to provide VDD power to >       the sensor. > > I have no vdd or vdd-supply property in my ak8963 description. > > Is that unrelated ? > > What should I write in my dts file for this ak8963 embedded in a mpu9250 ? > > Thanks in advance > > Philippe > > -- > Philippe De Muyter +32 2 6101532 Macq SA rue de l'Aeronef 2 B-1140 Bruxelles