From patchwork Fri Oct 11 14:43:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 11185663 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F1EBE13BD for ; Fri, 11 Oct 2019 14:44:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D355221D7F for ; Fri, 11 Oct 2019 14:44:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727812AbfJKOn4 (ORCPT ); Fri, 11 Oct 2019 10:43:56 -0400 Received: from relay10.mail.gandi.net ([217.70.178.230]:57595 "EHLO relay10.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727762AbfJKOnz (ORCPT ); Fri, 11 Oct 2019 10:43:55 -0400 Received: from xps13.stephanxp.local (lfbn-1-17395-211.w86-250.abo.wanadoo.fr [86.250.200.211]) (Authenticated sender: miquel.raynal@bootlin.com) by relay10.mail.gandi.net (Postfix) with ESMTPSA id 7AF9A24000D; Fri, 11 Oct 2019 14:43:52 +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 v4 3/8] iio: adc: max1027: Reset the device at probe time Date: Fri, 11 Oct 2019 16:43:42 +0200 Message-Id: <20191011144347.19146-4-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191011144347.19146-1-miquel.raynal@bootlin.com> References: <20191011144347.19146-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@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);