[PATCH v2 1/3] driver core: platform: Add the helper function devm_platform_get_and_ioremap_resource_byname()
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STALE1866d
From: Cai Huoqing <hidden>
Date: 2021-09-02 06:37:21
Also in:
linux-media, linux-mediatek, linux-pci, lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Linus Torvalds
Since provide the helper function devm_platform_ioremap_resource_byname() which is wrap platform_get_resource_byname() and devm_ioremap_resource(). But sometimes, many drivers still need to use the resource variables obtained by platform_get_resource(). In these cases, provide this helper function devm_platform_get_and_ioremap_resource_byname(). Signed-off-by: Cai Huoqing <redacted> --- v1->v2: Resend this patch as part of a patch series that uses the new function. drivers/base/platform.c | 30 ++++++++++++++++++++++++++---- include/linux/platform_device.h | 3 +++ 2 files changed, 29 insertions(+), 4 deletions(-)
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 652531f67135..34bb581338d9 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c@@ -124,6 +124,31 @@ void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev, } EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource); +/** + * devm_platform_get_and_ioremap_resource_byname - call devm_ioremap_resource() for a + * platform device and get resource + * + * @pdev: platform device to use both for memory resource lookup as well as + * resource management + * @name: name of the resource + * @res: optional output parameter to store a pointer to the obtained resource. + * + * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code + * on failure. + */ +void __iomem * +devm_platform_get_and_ioremap_resource_byname(struct platform_device *pdev, + const char *name, struct resource **res) +{ + struct resource *r; + + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, name); + if (res) + *res = r; + return devm_ioremap_resource(&pdev->dev, r); +} +EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_resource_byname); + /** * devm_platform_ioremap_resource_byname - call devm_ioremap_resource for * a platform device, retrieve the
@@ -140,10 +165,7 @@ 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); + return devm_platform_get_and_ioremap_resource_byname(pdev, name, NULL); } EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname); #endif /* CONFIG_HAS_IOMEM */
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 7c96f169d274..50eb1a5b503a 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h@@ -66,6 +66,9 @@ extern void __iomem * devm_platform_ioremap_resource(struct platform_device *pdev, unsigned int index); extern void __iomem * +devm_platform_get_and_ioremap_resource_byname(struct platform_device *pdev, + const char *name, struct resource **res); +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);
--
2.25.1
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