From nobody Fri Jan 2 02:41:39 2026 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 F0AD8CDB465 for ; Mon, 16 Oct 2023 15:43:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233743AbjJPPne (ORCPT ); Mon, 16 Oct 2023 11:43:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232135AbjJPPn2 (ORCPT ); Mon, 16 Oct 2023 11:43:28 -0400 Received: from mail-oo1-xc36.google.com (mail-oo1-xc36.google.com [IPv6:2607:f8b0:4864:20::c36]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 87BE4F3 for ; Mon, 16 Oct 2023 08:43:26 -0700 (PDT) Received: by mail-oo1-xc36.google.com with SMTP id 006d021491bc7-57ba5f05395so2872931eaf.1 for ; Mon, 16 Oct 2023 08:43:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20230601.gappssmtp.com; s=20230601; t=1697471006; x=1698075806; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=MlKED5cDX4/M6RtMRhnbbTpnZitsZnGbgslw3+b0ID8=; b=XU6B6WGnnCr97JXcgd85B4yek2KrTx6NX62lt8duS2SfwRKSWvK1yADhalunxrUYrf aelpDPzWibRDhdqo7Ul8+QzKv2c65aEbw1brhulyRTP4eBKYVauZ9AvwbUCKa7V80ier gIO5CjkGJlKvXpTsVrE33cQvLDbkrS30qOFjwSnUyGwf5Bc2L7nz6YT8GKHQSVOG0Dv1 9qM4wCpXCgV9LN5uiamgqrNYekLdHxrX3xGyoZRVKyzBK0yhxjvDrKU6uz2PBtVXWjOl 8VtYqKZMaTdJl41LnaHiZ5u3lknO4K1i+aYhWcJEqO4Bbq0l7g3v1V+sy6QDZ08wlg9W 3hAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697471006; x=1698075806; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=MlKED5cDX4/M6RtMRhnbbTpnZitsZnGbgslw3+b0ID8=; b=VWGZhGT/7t+K0ngDDvnZ4PACLCcOFSGwslh1GbRo8uV2VpktqD3/8LB7RZl2bXlE4G Ui+xUFmBFlgl//wsKtuCEmEx4QPueM6JZy9JplpsiObwd4yzdhRcBsjHq9RVAcxUm1m9 EALP11WBuCh+foAU1EfI2JO3B9Z3mgkTy1XNhDveo3J8ftGeh3jdtsWZza3z98FLalas yMEN+rCHc0ta+6YQ3MsWWhJvTqQFgckZd+jag0zKQoKRyy0UYvxMiaeUa6Jzup9RC1Q/ gPoLPVhu3aq3RdCXWzs/VrmfXHtSYSMonMWPIuUKs08PLZ+CMrjjerxl7F8S+diCA9U2 9VHw== X-Gm-Message-State: AOJu0Yw1LVGza+uZIxoQ50smMZYNOXHo89ZiFAE9u6VnoFm4lQ8OYGUl voaKzElv7I2V93uumgc6cPLZr1PQDAFl0l2UN71ogw== X-Google-Smtp-Source: AGHT+IHgf0crmnnbH2S+hBlp+z4v3au1y/pafgssxZtwQGZp3PMuDIsa+dColbvineFADD3dOo2nXA== X-Received: by 2002:a4a:3009:0:b0:57b:92f2:1f64 with SMTP id q9-20020a4a3009000000b0057b92f21f64mr36167216oof.8.1697471005822; Mon, 16 Oct 2023 08:43:25 -0700 (PDT) Received: from freyr.lechnology.com (ip98-183-112-25.ok.ok.cox.net. [98.183.112.25]) by smtp.gmail.com with ESMTPSA id w18-20020a4ad032000000b0057327cecdd8sm1122632oor.10.2023.10.16.08.43.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Oct 2023 08:43:25 -0700 (PDT) From: David Lechner To: linux-iio@vger.kernel.org Cc: David Lechner , Jonathan Cameron , Michael Hennerich , nuno.sa@analog.com, linux-kernel@vger.kernel.org Subject: [PATCH] iio: resolver: ad2s1210: add reset gpio support Date: Mon, 16 Oct 2023 10:43:09 -0500 Message-ID: <20231016154311.38547-1-dlechner@baylibre.com> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" This adds support for the optional reset gpio to the ad2s1210 resolver driver. If the gpio is present in the device tree, it is toggled during driver probe before the reset of the device initialization. As per the devicetree bindings, it is expected for the gpio to configured as active low. Suggested-by: Michael Hennerich Signed-off-by: David Lechner Acked-by: Michael Hennerich --- drivers/iio/resolver/ad2s1210.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/iio/resolver/ad2s1210.c b/drivers/iio/resolver/ad2s121= 0.c index 8646389ec88d..a414eef12e5e 100644 --- a/drivers/iio/resolver/ad2s1210.c +++ b/drivers/iio/resolver/ad2s1210.c @@ -1426,6 +1426,7 @@ static int ad2s1210_setup_gpios(struct ad2s1210_state= *st) { struct device *dev =3D &st->sdev->dev; struct gpio_descs *resolution_gpios; + struct gpio_desc *reset_gpio; DECLARE_BITMAP(bitmap, 2); int ret; =20 @@ -1481,6 +1482,17 @@ static int ad2s1210_setup_gpios(struct ad2s1210_stat= e *st) "failed to set resolution gpios\n"); } =20 + /* If the optional reset GPIO is present, toggle it to do a hard reset. */ + reset_gpio =3D devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(reset_gpio)) + return dev_err_probe(dev, PTR_ERR(reset_gpio), + "failed to request reset GPIO\n"); + + if (reset_gpio) { + udelay(10); + gpiod_set_value(reset_gpio, 0); + } + return 0; } =20 --=20 2.42.0