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[149.14.88.26]) by smtp.gmail.com with ESMTPSA id dm4-20020ad44e24000000b00680613267d5sm2732554qvb.115.2024.01.08.01.20.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jan 2024 01:20:54 -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 v2 1/2] platform_device: add devres function region-reqs Date: Mon, 8 Jan 2024 10:20:42 +0100 Message-ID: <20240108092042.16949-3-pstanner@redhat.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240108092042.16949-2-pstanner@redhat.com> References: <20240108092042.16949-2-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 | 38 +++++++++++++++++++++++++++++++++ include/linux/platform_device.h | 3 +++ 2 files changed, 41 insertions(+) diff --git a/drivers/base/platform.c b/drivers/base/platform.c index 10c577963418..7b29e6da31ae 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -82,6 +82,44 @@ struct resource *platform_get_mem_or_io(struct platform_device *dev, } EXPORT_SYMBOL_GPL(platform_get_mem_or_io); +/** + * devm_platform_get_and_request_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_and_request_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_and_request_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..44e4ba930d5f 100644 --- a/include/linux/platform_device.h +++ b/include/linux/platform_device.h @@ -59,6 +59,9 @@ 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_and_request_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,