From patchwork Fri Nov 11 14:39:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rasmus Villemoes X-Patchwork-Id: 624028 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26CC2C433FE for ; Fri, 11 Nov 2022 14:40:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234688AbiKKOj6 (ORCPT ); Fri, 11 Nov 2022 09:39:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48740 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234649AbiKKOju (ORCPT ); Fri, 11 Nov 2022 09:39:50 -0500 Received: from mail-ej1-x630.google.com (mail-ej1-x630.google.com [IPv6:2a00:1450:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D35A65BD79 for ; Fri, 11 Nov 2022 06:39:31 -0800 (PST) Received: by mail-ej1-x630.google.com with SMTP id t25so12971407ejb.8 for ; Fri, 11 Nov 2022 06:39:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rasmusvillemoes.dk; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=JAMGBaW4DNgnbxHPENr1NAw38Yk5iEpRnIys3RSCUnE=; b=DVseHuqQ+fdeqFq/cg5i/yOGTG4qIR6mwKQlbApHL7hGPLZtwKD+3PuBn6DEtxZjzU SCj3NzZbHwsYr6cAIdX0AtIDt+EioB8psnFybSyTkN0Os88giBjtV7Je58ZV2J9NqiGM BK8t6Pl/+wsQ9rzJbLDdqP2UxZQGL4OEuiVos= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=JAMGBaW4DNgnbxHPENr1NAw38Yk5iEpRnIys3RSCUnE=; b=EKZsIx3h5+I4feLYyuYB6cW2/clzqTZz0tx15Wr5Ovw98r0xavgLzWFgH8I0Bgk5mE E5RsQzjH8kg0zs3Bk12IaK9K3BGcbUrnBKVzZcqWUCdml0X0068QXaTRRlUpXoBBNdsb TBP1BauOBrk6JacUi9c4TWcYu/U10T6CbeIR2zCcreVBMwr3DTTysWqVCAPQOk73+4Sb GWLcQhLMVCrmIbH6rTJiM5E+L7IfSp2Zl8MUsdS31h0f2kVCTvKTUBAt5MqOvfnCk02G iqmC9xGT2cRFOB9Ukdh/+cg8QLjuhtYeO/+vsxRFegCfgKhUZp/BX8bDAcCUOPbEXjYH JvrA== X-Gm-Message-State: ANoB5pnmiY9whAwaGcO8P7/OBQciDNsqMze314zCDSgbe0r4/qaOWNCX 31b6C6p8+M+NiPiWeBTscKLEpQ== X-Google-Smtp-Source: AA0mqf6uSSRRx4Q/XNl8iM4CFB+rpwgzG4zqyxc1Y93PWapbVBiCTtJEFTV0LfFQL7WkrlvtCR5YjA== X-Received: by 2002:a17:906:f113:b0:78d:addf:67c1 with SMTP id gv19-20020a170906f11300b0078daddf67c1mr2043542ejb.272.1668177569930; Fri, 11 Nov 2022 06:39:29 -0800 (PST) Received: from prevas-ravi.tritech.se ([80.208.71.65]) by smtp.gmail.com with ESMTPSA id jt4-20020a170906dfc400b007a1d4944d45sm945886ejc.142.2022.11.11.06.39.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Nov 2022 06:39:29 -0800 (PST) From: Rasmus Villemoes To: Cosmin Tanislav , Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron Cc: devicetree@vger.kernel.org, Rob Herring , Rasmus Villemoes , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/5] iio: addac: ad74413r: add support for reset-gpio Date: Fri, 11 Nov 2022 15:39:21 +0100 Message-Id: <20221111143921.742194-6-linux@rasmusvillemoes.dk> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20221111143921.742194-1-linux@rasmusvillemoes.dk> References: <20221111143921.742194-1-linux@rasmusvillemoes.dk> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org We have a board where the reset pin of the ad74412 is connected to a gpio, but also pulled low by default. Hence to get the chip out of reset, the driver needs to know about that gpio and set it high before attempting to communicate with it. When a reset-gpio is given in device tree, use that instead of the software reset. According to the data sheet, the two methods are functionally equivalent. Signed-off-by: Rasmus Villemoes --- drivers/iio/addac/ad74413r.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/iio/addac/ad74413r.c b/drivers/iio/addac/ad74413r.c index 9f77d2f514de..af09d43f921c 100644 --- a/drivers/iio/addac/ad74413r.c +++ b/drivers/iio/addac/ad74413r.c @@ -71,6 +71,7 @@ struct ad74413r_state { struct regmap *regmap; struct device *dev; struct iio_trigger *trig; + struct gpio_desc *reset_gpio; size_t adc_active_channels; struct spi_message adc_samples_msg; @@ -393,6 +394,13 @@ static int ad74413r_reset(struct ad74413r_state *st) { int ret; + if (st->reset_gpio) { + gpiod_set_value_cansleep(st->reset_gpio, 1); + fsleep(50); + gpiod_set_value_cansleep(st->reset_gpio, 0); + return 0; + } + ret = regmap_write(st->regmap, AD74413R_REG_CMD_KEY, AD74413R_CMD_KEY_RESET1); if (ret) @@ -1316,6 +1324,10 @@ static int ad74413r_probe(struct spi_device *spi) if (IS_ERR(st->regmap)) return PTR_ERR(st->regmap); + st->reset_gpio = devm_gpiod_get_optional(st->dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(st->reset_gpio)) + return PTR_ERR(st->reset_gpio); + st->refin_reg = devm_regulator_get_optional(st->dev, "refin"); if (IS_ERR(st->refin_reg)) { ret = PTR_ERR(st->refin_reg);