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=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,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 3E9F3C433DF for ; Wed, 27 May 2020 15:58:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 13BCE208E4 for ; Wed, 27 May 2020 15:58:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=cerno.tech header.i=@cerno.tech header.b="B3+uwRjU"; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b="kNycR28Z" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390066AbgE0PtY (ORCPT ); Wed, 27 May 2020 11:49:24 -0400 Received: from new1-smtp.messagingengine.com ([66.111.4.221]:44381 "EHLO new1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387987AbgE0PtV (ORCPT ); Wed, 27 May 2020 11:49:21 -0400 Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailnew.nyi.internal (Postfix) with ESMTP id 6F4BB581FEA; Wed, 27 May 2020 11:49:20 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute4.internal (MEProxy); Wed, 27 May 2020 11:49:20 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cerno.tech; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=fm2; bh=r517+YT5Oy8Rd MCEZLSTodi2E3DjytFc7pLa4aHgYec=; b=B3+uwRjUFw0LhBTnAodZo/G3rbFCX NT43/84B+++BXF5lFHaNiqP6XKhtQsr/CJb5YLg5KYLn/SKM9bAvP1pYJghT/VHH 5zdedQfLbYFvm+kBE6pkwE2lNjsa28xB6IMcaAU25QvE2FB2fnBevnGbN2alHtKa mSwtT/sac6F/DsUjT2c6W556NwL40OxQq+xIEN3TCdJ8WbfZOe2rQYaeH5I4wbz/ xkynXPFuLZHPoSXvmJ5AFBsKvjkuelj7wptiwNwxXonEn4E9xFJjVuWySP0WM7r0 zmI2mS2hOUIpsZ6/uqisxnX4YIfrq3zlsvbykAdiyc9IfAcqWEQd655tg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:date:from :in-reply-to:message-id:mime-version:references:subject:to :x-me-proxy:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s= fm2; bh=r517+YT5Oy8RdMCEZLSTodi2E3DjytFc7pLa4aHgYec=; b=kNycR28Z 7D6BcoRgZMZ3U6qEsGmpfubqSUHn5YHXyMh2sUpixqBgNEVvYBfWi1mmdg33lbAY 03mu06/Xe1zFxjqooVTtcWdQruU5FYQZxRNIX5oOS+2IniDrmNZjizeIWK/auoRE idWSI+3NVr8kT8JKlppy8bqFDnRN1P50s/8cqGnQUpCTWFuELBeHk6N/l/U2xrqf eytKVrJsQTaTbKfDld62O7Vyy7qaayosOcMkigzbTpnmyxm5HckNqKCVn8K7Uq3Q WBW7AAPEJZ03cW8m663tT1Ig5SfuQv/g6nOs+J7OGbxwg+LLTIVrR9oimqB5QI4j u8ClrtBcBmbjYg== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduhedruddvgedgkeefucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephffvufffkffojghfggfgsedtkeertdertddtnecuhfhrohhmpeforgigihhm vgcutfhiphgrrhguuceomhgrgihimhgvsegtvghrnhhordhtvggthheqnecuggftrfgrth htvghrnhepvdekleevfeffkeejhfffueelteelfeduieefheduudfggffhhfffheevveeh hedvnecukfhppeeltddrkeelrdeikedrjeeinecuvehluhhsthgvrhfuihiivgepvdegne curfgrrhgrmhepmhgrihhlfhhrohhmpehmrgigihhmvgestggvrhhnohdrthgvtghh X-ME-Proxy: Received: from localhost (lfbn-tou-1-1502-76.w90-89.abo.wanadoo.fr [90.89.68.76]) by mail.messagingengine.com (Postfix) with ESMTPA id 0B61F328005E; Wed, 27 May 2020 11:49:19 -0400 (EDT) From: Maxime Ripard To: Nicolas Saenz Julienne , Eric Anholt Cc: dri-devel@lists.freedesktop.org, linux-rpi-kernel@lists.infradead.org, bcm-kernel-feedback-list@broadcom.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Dave Stevenson , Tim Gover , Phil Elwell , Maxime Ripard , Philipp Zabel Subject: [PATCH v3 002/105] reset: simple: Add reset callback Date: Wed, 27 May 2020 17:47:32 +0200 Message-Id: X-Mailer: git-send-email 2.26.2 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The reset-simple code lacks a reset callback that is still pretty easy to implement. The only real thing to consider is the delay needed for a device to be reset, so let's expose that as part of the reset-simple driver data. Cc: Philipp Zabel Reviewed-by: Philipp Zabel Signed-off-by: Maxime Ripard --- drivers/reset/reset-simple.c | 20 ++++++++++++++++++++ include/linux/reset/reset-simple.h | 7 +++++++ 2 files changed, 27 insertions(+) diff --git a/drivers/reset/reset-simple.c b/drivers/reset/reset-simple.c index c854aa351640..e066614818a3 100644 --- a/drivers/reset/reset-simple.c +++ b/drivers/reset/reset-simple.c @@ -11,6 +11,7 @@ * Maxime Ripard */ +#include #include #include #include @@ -63,6 +64,24 @@ static int reset_simple_deassert(struct reset_controller_dev *rcdev, return reset_simple_update(rcdev, id, false); } +static int reset_simple_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct reset_simple_data *data = to_reset_simple_data(rcdev); + int ret; + + if (!data->reset_us) + return -ENOTSUPP; + + ret = reset_simple_assert(rcdev, id); + if (ret) + return ret; + + usleep_range(data->reset_us, data->reset_us * 2); + + return reset_simple_deassert(rcdev, id); +} + static int reset_simple_status(struct reset_controller_dev *rcdev, unsigned long id) { @@ -80,6 +99,7 @@ static int reset_simple_status(struct reset_controller_dev *rcdev, const struct reset_control_ops reset_simple_ops = { .assert = reset_simple_assert, .deassert = reset_simple_deassert, + .reset = reset_simple_reset, .status = reset_simple_status, }; EXPORT_SYMBOL_GPL(reset_simple_ops); diff --git a/include/linux/reset/reset-simple.h b/include/linux/reset/reset-simple.h index 08ccb25a55e6..c3e44f45b0f7 100644 --- a/include/linux/reset/reset-simple.h +++ b/include/linux/reset/reset-simple.h @@ -27,6 +27,12 @@ * @status_active_low: if true, bits read back as cleared while the reset is * asserted. Otherwise, bits read back as set while the * reset is asserted. + * @reset_us: Minimum delay in microseconds needed that needs to be + * waited for between an assert and a deassert to reset the + * device. If multiple consumers with different delay + * requirements are connected to this controller, it must + * be the largest minimum delay. 0 means that such a delay is + * unknown and the reset operation is unsupported. */ struct reset_simple_data { spinlock_t lock; @@ -34,6 +40,7 @@ struct reset_simple_data { struct reset_controller_dev rcdev; bool active_low; bool status_active_low; + unsigned int reset_us; }; extern const struct reset_control_ops reset_simple_ops; -- git-series 0.9.1