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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 0AF74C32792 for ; Thu, 3 Oct 2019 17:34:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D80772086A for ; Thu, 3 Oct 2019 17:34:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387695AbfJCReY (ORCPT ); Thu, 3 Oct 2019 13:34:24 -0400 Received: from relay9-d.mail.gandi.net ([217.70.183.199]:35929 "EHLO relay9-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733244AbfJCReQ (ORCPT ); Thu, 3 Oct 2019 13:34:16 -0400 X-Originating-IP: 91.224.148.103 Received: from localhost.localdomain (unknown [91.224.148.103]) (Authenticated sender: miquel.raynal@bootlin.com) by relay9-d.mail.gandi.net (Postfix) with ESMTPSA id 23AF6FF80B; Thu, 3 Oct 2019 17:34:13 +0000 (UTC) From: Miquel Raynal To: Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Rob Herring , Mark Rutland Cc: , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Thomas Petazzoni , Miquel Raynal Subject: [PATCH v2 3/7] iio: adc: max1027: Reset the device at probe time Date: Thu, 3 Oct 2019 19:33:57 +0200 Message-Id: <20191003173401.16343-4-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191003173401.16343-1-miquel.raynal@bootlin.com> References: <20191003173401.16343-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org All the registers are configured by the driver, let's reset the chip at probe time, avoiding any conflict with a possible earlier configuration. Signed-off-by: Miquel Raynal --- drivers/iio/adc/max1027.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c index 823223b77a70..f9b473ee6711 100644 --- a/drivers/iio/adc/max1027.c +++ b/drivers/iio/adc/max1027.c @@ -466,6 +466,14 @@ static int max1027_probe(struct spi_device *spi) } } + /* Internal reset */ + st->reg = MAX1027_RST_REG; + ret = spi_write(st->spi, &st->reg, 1); + if (ret < 0) { + dev_err(&indio_dev->dev, "Failed to reset the ADC\n"); + return ret; + } + /* Disable averaging */ st->reg = MAX1027_AVG_REG; ret = spi_write(st->spi, &st->reg, 1); -- 2.20.1