From patchwork Fri Jan 5 17:22:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philipp Stanner X-Patchwork-Id: 13512409 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1B219C3DA6E for ; Fri, 5 Jan 2024 17:23:22 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 08BD510E648; Fri, 5 Jan 2024 17:23:19 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 190DE10E647 for ; Fri, 5 Jan 2024 17:23:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1704475396; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xBgR6EF/EirqUkTInXMLhcQ/iDbvWyd/X1PfgAKAIyE=; b=E7Q2h+cL5f8y7zwJ918pDc/3dv927i86dkEE+njEVnKb2tR3Vd8lvdYtIrFuyJXESX/Z/c cGnMVybqlVgAkr9+dhJDjfwENThCjGOpx+dpE7rkhDrkHaT1GW+G3npIFvC3SDqUm5vfHp Y2w+lOXz/uo4HZDFuPUPCqSq+90x5Oc= Received: from mail-vs1-f70.google.com (mail-vs1-f70.google.com [209.85.217.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-192-fCpbV6nEPz2hlQANTlkOwg-1; Fri, 05 Jan 2024 12:23:15 -0500 X-MC-Unique: fCpbV6nEPz2hlQANTlkOwg-1 Received: by mail-vs1-f70.google.com with SMTP id ada2fe7eead31-4670ca688easo169586137.1 for ; Fri, 05 Jan 2024 09:23:15 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1704475394; x=1705080194; 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=xBgR6EF/EirqUkTInXMLhcQ/iDbvWyd/X1PfgAKAIyE=; b=byCwY26F2rXt/djxbcRsPho8zTYxZ4e+1yglRoA5PNRpPQRk2vAIDwu1QXTyvZqZ0/ FjJRQZYAVD5WOuWlZKX49McOyFg+PNLlMzc4xq7HvRh12SLmoXGVsxXJDUADUSIPlbYS zNyhTWktqMkZoHB5GuA6wvH87aDIOmERZN2CBF+3Wy3U/SDDo5L4up6fU1oDRtNUeP5c sitOqf1GttDSw4zFeZ6I7ij/P/dbbR5/i+YiWo0krPCY5Zh2lZtamHztqWo66tKfrRXv RXLzP9ul3kYhOQ7jBBb4B61LczZBR0XElAqciuZXzFH42sqEc1U5tky6dgNhnhFPF7f7 mdBg== X-Gm-Message-State: AOJu0YztgI1sxkPU2+sKcuD4AJdDrR2vjWAWHdvviIAZW2QWHF1ZkWx2 JH3eZ588oZRBjCKzST/JMI0z8G7J6Wcsz5U1otcaXjuf62idLVFOcMbWm9Icbp5cciq0wDdXl5r IV9d2ml7bV4Y5YhKzN3ylk9hY6NtSCenpDbCq X-Received: by 2002:a67:ecda:0:b0:467:55c5:588 with SMTP id i26-20020a67ecda000000b0046755c50588mr4120291vsp.3.1704475394637; Fri, 05 Jan 2024 09:23:14 -0800 (PST) X-Google-Smtp-Source: AGHT+IGTkGeaWdrkvk9vkGZOM8wRaOT8a6juJhCYrGyYaDRBNcd8dZEL/Cbb4G38NHhLuk+2Ph/AUQ== X-Received: by 2002:a67:ecda:0:b0:467:55c5:588 with SMTP id i26-20020a67ecda000000b0046755c50588mr4120262vsp.3.1704475394262; Fri, 05 Jan 2024 09:23:14 -0800 (PST) Received: from pstanner-thinkpadt14sgen1.remote.csb ([2001:9e8:32d1:a900:227b:d2ff:fe26:2a7a]) by smtp.gmail.com with ESMTPSA id t22-20020ac865d6000000b004282c862fccsm884750qto.57.2024.01.05.09.23.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Jan 2024 09:23:13 -0800 (PST) From: Philipp Stanner To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Laurentiu Palcu , Lucas Stach , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Mark Brown , Takashi Iwai , David Gow , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= Subject: [PATCH 1/2] platform_device: add devres function region-reqs Date: Fri, 5 Jan 2024 18:22:18 +0100 Message-ID: <20240105172218.42457-3-pstanner@redhat.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240105172218.42457-2-pstanner@redhat.com> References: <20240105172218.42457-2-pstanner@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Philipp Stanner Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Some drivers want to use (request) a region exclusively but nevertheless create several mappings within that region. Currently, there is no managed devres function to request a region without mapping it. Add the function devm_platform_get_resource() Signed-off-by: Philipp Stanner --- drivers/base/platform.c | 37 +++++++++++++++++++++++++++++++++ include/linux/platform_device.h | 2 ++ 2 files changed, 39 insertions(+) diff --git a/drivers/base/platform.c b/drivers/base/platform.c index 10c577963418..243b9ec54d04 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -82,6 +82,43 @@ struct resource *platform_get_mem_or_io(struct platform_device *dev, } EXPORT_SYMBOL_GPL(platform_get_mem_or_io); +/** + * devm_platform_get_and_resource - get and request a resource + * + * @pdev: the platform device to get the resource from + * @type: resource type (either IORESOURCE_MEM or IORESOURCE_IO) + * @num: resource index + * @name: name to be associated with the request + * + * Return: a pointer to the resource on success, an ERR_PTR on failure. + * + * Gets a resource and requests it. Use this instead of + * devm_platform_ioremap_resource() only if you have to create several single + * mappings with devm_ioremap(). + */ +struct resource *devm_platform_get_resource(struct platform_device *pdev, + unsigned int type, unsigned int num, const char *name) +{ + struct resource *res; + + res = platform_get_resource(pdev, type, num); + if (!res) + return ERR_PTR(-EINVAL); + + if (type & IORESOURCE_MEM) + res = devm_request_mem_region(&pdev->dev, res->start, res->end, name); + else if (type & IORESOURCE_IO) + res = devm_request_region(&pdev->dev, res->start, res->end, name); + else + return ERR_PTR(-EINVAL); + + if (!res) + return ERR_PTR(-EBUSY); + + return res; +} +EXPORT_SYMBOL_GPL(devm_platform_get_resource); + #ifdef CONFIG_HAS_IOMEM /** * devm_platform_get_and_ioremap_resource - call devm_ioremap_resource() for a diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h index 7a41c72c1959..68e2857521f4 100644 --- a/include/linux/platform_device.h +++ b/include/linux/platform_device.h @@ -59,6 +59,8 @@ extern struct resource *platform_get_resource(struct platform_device *, unsigned int, unsigned int); extern struct resource *platform_get_mem_or_io(struct platform_device *, unsigned int); +extern struct resource *devm_platform_get_resource(struct platform_device *pdev, + unsigned int type, unsigned int num, const char *name); extern struct device * platform_find_device_by_driver(struct device *start,