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Subject[PATCH 1/2] drivers: provide devm_platform_ioremap_resource()
Date
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

There are currently 1200+ instances of using platform_get_resource()
and devm_ioremap_resource() together in the kernel tree.

This patch wraps these two calls in a single helper. Thanks to that
we don't have to declare a local variable for struct resource * and can
omit the redundant argument for resource type. We also have one
function call less.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
drivers/base/platform.c | 18 ++++++++++++++++++
include/linux/platform_device.h | 3 +++
2 files changed, 21 insertions(+)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 1c958eb33ef4..14400a63cc81 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -79,6 +79,24 @@ struct resource *platform_get_resource(struct platform_device *dev,
}
EXPORT_SYMBOL_GPL(platform_get_resource);

+/**
+ * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
+ * device
+ *
+ * @pdev: platform device to use both for memory resource lookup as well as
+ * resource managemend
+ * @index: resource index
+ */
+void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
+ unsigned int index)
+{
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, index);
+ return devm_ioremap_resource(&pdev->dev, res);
+}
+EXPORT_SYMBOL(devm_platform_ioremap_resource);
+
/**
* platform_get_irq - get an IRQ for a device
* @dev: platform device
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index c7c081dc6034..b126b73ed8ef 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -52,6 +52,9 @@ extern struct device platform_bus;
extern void arch_setup_pdev_archdata(struct platform_device *);
extern struct resource *platform_get_resource(struct platform_device *,
unsigned int, unsigned int);
+extern void __iomem *
+devm_platform_ioremap_resource(struct platform_device *pdev,
+ unsigned int index);
extern int platform_get_irq(struct platform_device *, unsigned int);
extern int platform_irq_count(struct platform_device *);
extern struct resource *platform_get_resource_byname(struct platform_device *,
--
2.20.1
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