From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Date: Tue, 22 Oct 2019 10:43:16 +0200
Subject: drivers: provide devm_platform_ioremap_resource_byname()
Git-commit: c9c8641d3ebd79274af75f7df3e6a9c6cc8a66e9
Patch-mainline: v5.5-rc1
References: bsc#1179344
Provide a variant of devm_platform_ioremap_resource() that allows to
lookup resources from platform devices by name rather than by index.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20191022084318.22256-7-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
Documentation/driver-api/driver-model/devres.rst | 1 +
drivers/base/platform.c | 20 ++++++++++++++++++++
include/linux/platform_device.h | 3 +++
3 files changed, 24 insertions(+)
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -318,6 +318,7 @@ IOMAP
devm_ioremap_resource() : checks resource, requests memory region, ioremaps
devm_ioremap_resource_wc()
devm_platform_ioremap_resource_wc()
+ devm_platform_ioremap_resource_byname()
devm_iounmap()
pcim_iomap()
pcim_iomap_regions() : do request_region() and iomap() on multiple BARs
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -114,6 +114,26 @@ void __iomem *devm_platform_ioremap_reso
res = platform_get_resource(pdev, IORESOURCE_MEM, index);
return devm_ioremap_resource_wc(&pdev->dev, res);
}
+
+/**
+ * devm_platform_ioremap_resource_byname - call devm_ioremap_resource for
+ * a platform device, retrieve the
+ * resource by name
+ *
+ * @pdev: platform device to use both for memory resource lookup as well as
+ * resource management
+ * @name: name of the resource
+ */
+void __iomem *
+devm_platform_ioremap_resource_byname(struct platform_device *pdev,
+ const char *name)
+{
+ struct resource *res;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
+ return devm_ioremap_resource(&pdev->dev, res);
+}
+EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname);
#endif /* CONFIG_HAS_IOMEM */
/**
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -60,6 +60,9 @@ devm_platform_ioremap_resource(struct pl
extern void __iomem *
devm_platform_ioremap_resource_wc(struct platform_device *pdev,
unsigned int index);
+extern void __iomem *
+devm_platform_ioremap_resource_byname(struct platform_device *pdev,
+ const char *name);
extern int platform_get_irq(struct platform_device *, unsigned int);
extern int platform_get_irq_optional(struct platform_device *, unsigned int);
extern int platform_irq_count(struct platform_device *);