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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 381F9C3276F for ; Thu, 2 Jan 2020 22:42:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 038F2217F4 for ; Thu, 2 Jan 2020 22:42:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578004953; bh=kI714KhdZOV86NSLDIwxv61nxxSXvDcFcQ6Rb3avn6I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=vwU2Sev12umU17llgsya3PfXuoGX7QJNBgvI0bwgT7i563NQjbBcbyq49Z6SILtM3 ckMJQzpsiCQfA3wyfri6YGOtSwO9gUPWsDARVGSPQI6K1VD0/6aaBClpKFjmDhpUlQ VCVocbv9eZcnGckp2buloKHuL+Pf9Qik/adWRBFk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730949AbgABWmb (ORCPT ); Thu, 2 Jan 2020 17:42:31 -0500 Received: from mail.kernel.org ([198.145.29.99]:45956 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730597AbgABWfu (ORCPT ); Thu, 2 Jan 2020 17:35:50 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 77B2F20863; Thu, 2 Jan 2020 22:35:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578004549; bh=kI714KhdZOV86NSLDIwxv61nxxSXvDcFcQ6Rb3avn6I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TYJQDMN6kdbaj/jtF1pxTD6qGZz8EozPR/BEV0m/8jgp2QnLzenrv/HHIFijHpHqQ KlIUARVHtujL2Nfm76zYlo9F00GYMCxJikuk9NXcSX/XIVhTBQ41bWtCN2yhKZSMnM yspolCxPHxVXP+K0Gh8HtPKUnjTpxzjTHUkFC4eA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Miquel Raynal , Jonathan Cameron , Sasha Levin Subject: [PATCH 4.4 028/137] iio: adc: max1027: Reset the device at probe time Date: Thu, 2 Jan 2020 23:06:41 +0100 Message-Id: <20200102220550.401050486@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200102220546.618583146@linuxfoundation.org> References: <20200102220546.618583146@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Miquel Raynal [ Upstream commit db033831b4f5589f9fcbadb837614a7c4eac0308 ] 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 Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- 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 41d495c6035e..7d5e4114e7a8 100644 --- a/drivers/iio/adc/max1027.c +++ b/drivers/iio/adc/max1027.c @@ -470,6 +470,14 @@ static int max1027_probe(struct spi_device *spi) goto fail_dev_register; } + /* 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