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=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 E9873C3276C for ; Thu, 2 Jan 2020 22:28:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BCBD924649 for ; Thu, 2 Jan 2020 22:28:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578004108; bh=8RKd39AqhVyFyw2xMul4Zf0yEb61vjExGfdDm/nMk+8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hHolYSLPDseb99i/wy+/V/jaDtF/srYrNf7aJrsLQMH2rmm5wJBd/b85AYorGuG87 qY96ftlz3YjbaFSb4yCEAPnwi1BW2nppBkOS768Bw6lDTMhW33VnJ/ydgt0FFVzyuK QfZxaX4pA0uT3Fv6X8DL9FHpj2vnnrKolSL0Ew3k= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729868AbgABW21 (ORCPT ); Thu, 2 Jan 2020 17:28:27 -0500 Received: from mail.kernel.org ([198.145.29.99]:57876 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729925AbgABW2T (ORCPT ); Thu, 2 Jan 2020 17:28:19 -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 0CC6621835; Thu, 2 Jan 2020 22:28:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578004098; bh=8RKd39AqhVyFyw2xMul4Zf0yEb61vjExGfdDm/nMk+8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hPO9Y/iqZM5yWWv7XC0bMxQN1mf3G+uJ4Q3dodxfYU2ER07RTnJsai/D04n66uJwx 4BIJMsYasttEHC2LiENg15AQBAOkfsKznjiuRkBAQQi4dmeXYb4dDkb/P60GzhPibp JX3+LJ8XqvOpnZ80OXCICtzeEVF5XrHpFuefeEPg= 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 4.9 036/171] iio: adc: max1027: Reset the device at probe time Date: Thu, 2 Jan 2020 23:06:07 +0100 Message-Id: <20200102220552.057989442@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200102220546.960200039@linuxfoundation.org> References: <20200102220546.960200039@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 712fbd2b1f16..ec3f7bc70b75 100644 --- a/drivers/iio/adc/max1027.c +++ b/drivers/iio/adc/max1027.c @@ -471,6 +471,14 @@ 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