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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?= Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, Philipp Stanner 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240105_092318_216214_6D065994 X-CRM114-Status: GOOD ( 18.52 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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,