Subject: [PATCH] drivers: add devm_platform_ioremap_resource_byname() helper

From: Yangtao Li <[email-masked]>
Date: Tue, 10 Dec 2019 20:31:45 +0000

There are currently 300+ instances of using platform_get_resource_byname()
and devm_ioremap_resource() together in the kernel tree.

This patch wraps these two calls in a single helper.

Signed-off-by: Yangtao Li <[email-masked]>
---
 drivers/base/platform.c         | 22 +++++++++++++++++++++-
 include/linux/platform_device.h |  3 +++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index b6c6c7d97d5b..9c4f5e229600 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -60,6 +60,7 @@ struct resource *platform_get_resource(struct platform_device *dev,
 }
 EXPORT_SYMBOL_GPL(platform_get_resource);
 
+#ifdef CONFIG_HAS_IOMEM
 /**
  * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
  *				    device
@@ -68,7 +69,7 @@ EXPORT_SYMBOL_GPL(platform_get_resource);
  *        resource management
  * @index: resource index
  */
-#ifdef CONFIG_HAS_IOMEM
+
 void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
 					     unsigned int index)
 {
@@ -78,6 +79,25 @@ void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
 	return devm_ioremap_resource(&pdev->dev, res);
 }
 EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource);
+
+/**
+ * devm_platform_ioremap_resource_byname - call devm_ioremap_resource() for
+ *					   a platform device
+ *
+ * @pdev: platform device to use both for memory resource lookup as well as
+ *        resource managemend
+ * @name: resource name
+ */
+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 */
 
 static int __platform_get_irq(struct platform_device *dev, unsigned int num)
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 1b5cec067533..24ff5da9c532 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -63,6 +63,9 @@ extern int platform_irq_count(struct platform_device *);
 extern struct resource *platform_get_resource_byname(struct platform_device *,
 						     unsigned int,
 						     const char *);
+extern void __iomem *
+devm_platform_ioremap_resource_byname(struct platform_device *pdev,
+				      const char *name);
 extern int platform_get_irq_byname(struct platform_device *, const char *);
 extern int platform_add_devices(struct platform_device **, int);
 
-- 
2.17.1

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