linux-kernel - [PATCH] drivers: provide devm_platform_ioremap_and_get

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Date:   Sat, 14 Mar 2020 01:19:02 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     gregkh@...uxfoundation.org, rafael@...nel.org
Cc:     linux-kernel@...r.kernel.org, Dejin Zheng <zhengdejin5@...il.com>
Subject: [PATCH] drivers: provide devm_platform_ioremap_and_get_resource()

Since commit "drivers: provide devm_platform_ioremap_resource()",
It was wrap platform_get_resource() and devm_ioremap_resource() as
single helper devm_platform_ioremap_resource(). but now, many drivers
still used platform_get_resource() and devm_ioremap_resource()
together in the kernel tree. The reason can not be replaced is they
still need use the resource variables obtained by platform_get_resource().
so provide this helper.

Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
---
 drivers/base/platform.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 7fa654f1288b..b3e2409effae 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -62,6 +62,24 @@ struct resource *platform_get_resource(struct platform_device *dev,
 EXPORT_SYMBOL_GPL(platform_get_resource);
 
 #ifdef CONFIG_HAS_IOMEM
+/**
+ * devm_platform_ioremap_and_get_resource - 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
+ * @index: resource index
+ * @res: get the resource
+ */
+void __iomem *
+devm_platform_ioremap_and_get_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_and_get_resource);
+
 /**
  * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
  *				    device
-- 
2.25.0