From patchwork Sat Jan 23 16:34:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 1430770 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-tegra-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=n1oK2wPm; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4DNMG43TMfz9sRf for ; Sun, 24 Jan 2021 03:36:28 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725956AbhAWQgT (ORCPT ); Sat, 23 Jan 2021 11:36:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49604 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726159AbhAWQgR (ORCPT ); Sat, 23 Jan 2021 11:36:17 -0500 Received: from mail-lf1-x12c.google.com (mail-lf1-x12c.google.com [IPv6:2a00:1450:4864:20::12c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1AB9BC0613D6; Sat, 23 Jan 2021 08:35:36 -0800 (PST) Received: by mail-lf1-x12c.google.com with SMTP id p21so6779800lfu.11; Sat, 23 Jan 2021 08:35:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=RdS8PzD7Ibjy6mHF6U6e866r37t0ObE5ee8FBFWPC9o=; b=n1oK2wPmc1zKJb5temOL8TvyDObS4K6TbF/uNveszGj58KnxQ8qkJQWgHGcE04I3Po zkmDcN+8OFVBBCCvoZbw+weeXu+xBHEL961YnDu1RKSpwy26/gWmltgOBTBsCGxhHRSd p6roLj+8Uvk5JYIougyZFPFzHolpXPbyifYM+HMihlleYJ8XIV/XvNLPuGDEISais4sw U85ppclVzLMH2g8bXqeTBwDCe/djUeJatZcrnyazXlu0e9DLMjtOXif++d1p5XBPK4/G ft4PDyDcCNW4BsjNQ4TSlwFyRgQoqqM3SxbUJT15bJOww9+PNGKiqWWjt2RTehJX027T gYwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=RdS8PzD7Ibjy6mHF6U6e866r37t0ObE5ee8FBFWPC9o=; b=nKxpDKlwa23wWSU2uK2uRkVsOBsnkH58R7P0CUD4M81Z4CfA8UtLOfB4BvrqUt8miQ Ojp4EMbCMXvCrFYUhUekjo3p3uZ6aftqk3EqZrRbWZmwqMcdQB7Xuxg4YwKJ+N9k2r8C iwk4iQH1fmo6A4nPRG7Z7Az5gr7gm9SmxBiirVw6ftVhK8dlK+dlZMNycICVAJfpFPsb xB9F1/ODYhsisTG0If45Oznjmulp9i7W3adVlYRB+8Ek2qky5vpCovvRC65frpdch1UY 1q0tWZkijtOIJgoLyjkZS3dhqPiMte+0x8S/+sZsKsfmxU1zwSw44tFV8azHwfedfA+E w/rA== X-Gm-Message-State: AOAM531yp6GqMxzcXahhG0aK4bfdQxzTryR6e+Wtu6KYsZ8jjJm5zZ3e BHc95tapOwZx4AKo9WSzMWo= X-Google-Smtp-Source: ABdhPJxmBRw6XZAG+XWdhpK/dfFEU+9wpJLG3Cm/6r4knxc/zjJn8/WAFf+TkI5uWnN/lkCZnNQ0Ug== X-Received: by 2002:ac2:59ce:: with SMTP id x14mr135834lfn.545.1611419734536; Sat, 23 Jan 2021 08:35:34 -0800 (PST) Received: from localhost.localdomain (109-252-192-57.dynamic.spd-mgts.ru. [109.252.192.57]) by smtp.gmail.com with ESMTPSA id r26sm78594lfi.295.2021.01.23.08.35.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 Jan 2021 08:35:33 -0800 (PST) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Nicolas Chauvet , Matt Merhar , Peter Geis , Philipp Zabel Cc: linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v1] reset: Add devm_reset_control_get_optional_exclusive_released() Date: Sat, 23 Jan 2021 19:34:45 +0300 Message-Id: <20210123163445.24474-1-digetx@gmail.com> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org NVIDIA Tegra DRM and media drivers will need a resource-managed-optional variant of reset_control_get_exclusive_released() in order to switch away from a legacy Tegra-specific PD API to a GENPD API without much hassle. Add the new reset helper to the reset API. Tested-by: Peter Geis # Ouya T30 Tested-by: Nicolas Chauvet # PAZ00 T20 Tested-by: Matt Merhar # Ouya T30 Signed-off-by: Dmitry Osipenko --- Hello Philipp, This patch is a prerequisite for a power domain enablement using GENPD API on NVIDIA Tegra20/30 SoCs. The hardware resets are acquired by a Tegra PMC (Power Management Controller) driver until device is RPM-resumed if GENPD API is used, and thus, device drivers need to request resets in a released state. The resets are also optional, depending on hardware and DTB versions. This is why we will need the new helper. Will be awesome if you could pick up this patch for v5.12, this will help to avoid inter-subsystem dependencies for the driver patches that will target v5.13. Thanks in advance! include/linux/reset.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/include/linux/reset.h b/include/linux/reset.h index 439fec7112a9..b9109efa2a5c 100644 --- a/include/linux/reset.h +++ b/include/linux/reset.h @@ -362,6 +362,25 @@ __must_check devm_reset_control_get_exclusive_released(struct device *dev, return __devm_reset_control_get(dev, id, 0, false, false, false); } +/** + * devm_reset_control_get_optional_exclusive_released - resource managed + * reset_control_get_optional_exclusive_released() + * @dev: device to be reset by the controller + * @id: reset line name + * + * Managed-and-optional variant of reset_control_get_exclusive_released(). For + * reset controllers returned from this function, reset_control_put() is called + * automatically on driver detach. + * + * See reset_control_get_exclusive_released() for more information. + */ +static inline struct reset_control * +__must_check devm_reset_control_get_optional_exclusive_released(struct device *dev, + const char *id) +{ + return __devm_reset_control_get(dev, id, 0, false, true, false); +} + /** * devm_reset_control_get_shared - resource managed reset_control_get_shared() * @dev: device to be reset by the controller