drivers: provide devm_platform_ioremap_resource()

[ Upstream commit 7945f92 ]

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>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Stable-dep-of: 2d47b79 ("i2c: mux: reg: check return value after calling platform_get_resource()")
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/base/platform.c

@@ -80,6 +80,24 @@ 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_GPL(devm_platform_ioremap_resource);
+
 /**
  * platform_get_irq - get an IRQ for a device
  * @dev: platform device

include/linux/platform_device.h

@@ -51,6 +51,9 @@ 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 *,