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=-8.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 B5B09C433E0 for ; Sun, 31 May 2020 16:07:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 94E88207D5 for ; Sun, 31 May 2020 16:07:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="KbyogYbB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728206AbgEaQH0 (ORCPT ); Sun, 31 May 2020 12:07:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50336 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725912AbgEaQHY (ORCPT ); Sun, 31 May 2020 12:07:24 -0400 Received: from mail-wr1-x444.google.com (mail-wr1-x444.google.com [IPv6:2a00:1450:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 53807C061A0E; Sun, 31 May 2020 09:07:24 -0700 (PDT) Received: by mail-wr1-x444.google.com with SMTP id t18so9039799wru.6; Sun, 31 May 2020 09:07:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=CapCgV2d1NhfCbTsaerBgABIVhriquurUVOB7tln1bE=; b=KbyogYbBVkVVnBSfemSzcInJA586nTECQHMzcraM0avbirJ3uEYPTe/z24nIEjHCj0 DqP2P572K5zvO7ZLxayE5PSUle3ozdGIWVoBKYWu45GFW/bF9l9u0hVPRH9iAzOcGQBD e+26q1fNBFqObO1hWxoJMud/VXY0XLXht579Uj/BrXmNopN0+iY0ubmpWYZCeAUmwbp3 LfV+gKpEEGHxNt/n+j/cVU+MIaueGZ3V4/5KRdqEWa0dx54aHD8Ok5lpbuj+TmYv6aKq KJJBcvuAI37QO3eWaWDv7IH3r7d8WSZ4ekrs9CIRcbPNC5KThtHvZQXMQlb3UXfGrzgo 6XWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=CapCgV2d1NhfCbTsaerBgABIVhriquurUVOB7tln1bE=; b=GIt2DAuFovH6OlhxxdXXgqzYPudrhFHYoOOhr0EqYahX+lektD56rOJkqmAKMVfAfF 2lE/YeI7v8dJG6tS4JgHzxffjuMnEIigvGC/Q61kpcnYnn3riignzrNgMgH4loqbhCYY p1FZbkCb9ECeCQBvZytD9Fx8g3xz6itPHPfdE8r20anIdqnhEtUq2D67ojuzgAFFkvtS ktCWGwjNr+mTlL2ewRCCrQKd5jjo0SqcoJRNVu2ig1VhWdh53TPjKmmOVdzhJf98i/Of Nejhc51kNctBcpz2nzxJyTRgUYj2n461119TvqQCRqArj89IogR5HSmQmnDFadCorEZX EC4w== X-Gm-Message-State: AOAM531bj/pIdfKzEEKGrVk4g+x0zgC++Z8wdw5hpD4mYzNLcVR5F4hU mg9DZLMIMAkH0eA8A1wVeaw= X-Google-Smtp-Source: ABdhPJy48omdtNwC30dug5asQ1sEOcuySKSi4OIT7l8izh4UcyVNkpDADbpkNJMDk9nO6CSGNJ5RgQ== X-Received: by 2002:adf:82d0:: with SMTP id 74mr16964161wrc.138.1590941242781; Sun, 31 May 2020 09:07:22 -0700 (PDT) Received: from jonathan-N53SV ([151.81.100.29]) by smtp.gmail.com with ESMTPSA id 1sm8593355wmz.13.2020.05.31.09.07.21 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sun, 31 May 2020 09:07:22 -0700 (PDT) Date: Sun, 31 May 2020 18:07:19 +0200 From: Jonathan Albrieux To: Jonathan Cameron Cc: linux-kernel@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht, Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Andy Shevchenko , Linus Walleij , "open list:IIO SUBSYSTEM AND DRIVERS" Subject: Re: [PATCH v7 5/5] iio: magnetometer: ak8975: Add gpio reset support Message-ID: <20200531160719.GB19272@jonathan-N53SV> References: <20200528150106.12022-1-jonathan.albrieux@gmail.com> <20200531120230.27093a41@archlinux> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200531120230.27093a41@archlinux> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, May 31, 2020 at 12:02:30PM +0100, Jonathan Cameron wrote: > On Thu, 28 May 2020 17:01:05 +0200 > Jonathan Albrieux wrote: > > > According to AK09911 datasheet, if reset gpio is provided then > > deassert reset on ak8975_power_on() and assert reset on ak8975_power_off(). > > > > Without reset's deassertion during ak8975_power_on(), driver's probe fails > > on ak8975_who_i_am() while checking for device identity for AK09911 chip. > > > > AK09911 has an active low reset gpio to handle register's reset. > > AK09911 datasheet says that, if not used, reset pin should be connected > > to VID. This patch emulates this situation. > > > > Signed-off-by: Jonathan Albrieux > > Reviewed-by: Andy Shevchenko > > Reviewed-by: Stephan Gerhold > > Applied. Thanks, > > Jonathan > Thank you! Best regards, Jonathan Albrieux > > --- > > drivers/iio/magnetometer/ak8975.c | 18 ++++++++++++++++++ > > 1 file changed, 18 insertions(+) > > > > diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c > > index fd368455cd7b..a23422aad97d 100644 > > --- a/drivers/iio/magnetometer/ak8975.c > > +++ b/drivers/iio/magnetometer/ak8975.c > > @@ -358,6 +358,7 @@ struct ak8975_data { > > u8 asa[3]; > > long raw_to_gauss[3]; > > struct gpio_desc *eoc_gpiod; > > + struct gpio_desc *reset_gpiod; > > int eoc_irq; > > wait_queue_head_t data_ready_queue; > > unsigned long flags; > > @@ -384,6 +385,9 @@ static int ak8975_power_on(const struct ak8975_data *data) > > "Failed to enable specified Vid supply\n"); > > return ret; > > } > > + > > + gpiod_set_value_cansleep(data->reset_gpiod, 0); > > + > > /* > > * According to the datasheet the power supply rise time is 200us > > * and the minimum wait time before mode setting is 100us, in > > @@ -396,6 +400,8 @@ static int ak8975_power_on(const struct ak8975_data *data) > > /* Disable attached power regulator if any. */ > > static void ak8975_power_off(const struct ak8975_data *data) > > { > > + gpiod_set_value_cansleep(data->reset_gpiod, 1); > > + > > regulator_disable(data->vid); > > regulator_disable(data->vdd); > > } > > @@ -839,6 +845,7 @@ static int ak8975_probe(struct i2c_client *client, > > struct ak8975_data *data; > > struct iio_dev *indio_dev; > > struct gpio_desc *eoc_gpiod; > > + struct gpio_desc *reset_gpiod; > > const void *match; > > unsigned int i; > > int err; > > @@ -856,6 +863,16 @@ static int ak8975_probe(struct i2c_client *client, > > if (eoc_gpiod) > > gpiod_set_consumer_name(eoc_gpiod, "ak_8975"); > > > > + /* > > + * According to AK09911 datasheet, if reset GPIO is provided then > > + * deassert reset on ak8975_power_on() and assert reset on > > + * ak8975_power_off(). > > + */ > > + reset_gpiod = devm_gpiod_get_optional(&client->dev, > > + "reset", GPIOD_OUT_HIGH); > > + if (IS_ERR(reset_gpiod)) > > + return PTR_ERR(reset_gpiod); > > + > > /* Register with IIO */ > > indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); > > if (indio_dev == NULL) > > @@ -866,6 +883,7 @@ static int ak8975_probe(struct i2c_client *client, > > > > data->client = client; > > data->eoc_gpiod = eoc_gpiod; > > + data->reset_gpiod = reset_gpiod; > > data->eoc_irq = 0; > > > > err = iio_read_mount_matrix(&client->dev, "mount-matrix", &data->orientation); >