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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 29EFFC43603 for ; Tue, 10 Dec 2019 22:42:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E800720836 for ; Tue, 10 Dec 2019 22:42:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576017769; bh=liTrcPA/gmUVmqbPhhMcuFvRir8+iX6pr/GE8YldxqQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ZXNawT/VP3t7P3XZUTNNiuuyU+plcNoIjydTkkaITzUKSLK5KfVxsaTsVhbsqScIJ 8GZftmQK3uWzaztSVPLFuvNjyc3EuYQGDbqhBnZs/E3pb9fcZlalckk2yRGZccx74q 4e5ikYuJ01tkRX7iIUxbU+uYdFZSnFg9X1o3WDMg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728281AbfLJWbU (ORCPT ); Tue, 10 Dec 2019 17:31:20 -0500 Received: from mail.kernel.org ([198.145.29.99]:51250 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728220AbfLJWbR (ORCPT ); Tue, 10 Dec 2019 17:31:17 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0E2C12073D; Tue, 10 Dec 2019 22:31:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576017076; bh=liTrcPA/gmUVmqbPhhMcuFvRir8+iX6pr/GE8YldxqQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0HTML7Qqye+wqI4KUobwAJHIBVX9OU8mpWXslwZLzTZSBVaU+qKtcgBUzfg5uKaRf WpdA49VwO6qVqaLewLA2m7R9yVZbrADZ9l1PkMCK6VoNWC+Jmnhg/rJzg1sfOKR/Rm UGemYoqHZnLaNz3MNdNlC3FU9coZOOPKohCeXiYY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Miquel Raynal , Jonathan Cameron , Sasha Levin , linux-iio@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 34/91] iio: adc: max1027: Reset the device at probe time Date: Tue, 10 Dec 2019 17:29:38 -0500 Message-Id: <20191210223035.14270-34-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191210223035.14270-1-sashal@kernel.org> References: <20191210223035.14270-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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 712fbd2b1f162..ec3f7bc70b75e 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