linux-kernel - [PATCH 2/2] driver core: platform: provide devm_platform_iounremap

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Date:   Sun, 20 Sep 2020 19:38:08 +0800
From:   pierre Kuo <vichy.kuo@...il.com>
To:     gregkh@...uxfoundation.org, rafael@...nel.org
Cc:     linux-kernel@...r.kernel.org, pierre Kuo <vichy.kuo@...il.com>
Subject: [PATCH 2/2] driver core: platform: provide devm_platform_iounremap_resource

Combine platform_get_resource() and devm_iounremap_resource() to release
the iomem allocated by devm_platform_get_and_ioremap_resource().

Signed-off-by: pierre Kuo <vichy.kuo@...il.com>
---
 drivers/base/platform.c         | 24 ++++++++++++++++++++++++
 include/linux/platform_device.h |  4 ++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index e5d8a0503b4f..e2655c00873f 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -84,6 +84,30 @@ devm_platform_get_and_ioremap_resource(struct platform_device *pdev,
 }
 EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_resource);
 
+/**
+ * devm_platform_iounremap_resource - call devm_iounremap_resource() for a
+ *				      platform device with memory that addr points to.
+ *
+ * @pdev: platform device to use both for memory resource lookup as well as
+ *        resource management
+ * @index: resource index
+ * @addr: address to be unmap.
+ */
+void
+devm_platform_iounremap_resource(struct platform_device *pdev,
+				 unsigned int index, void __iomem *addr)
+{
+	struct resource *r;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, index);
+	if (!r)
+		dev_err(&pdev->dev,
+			"MEM resource index %d not found\n", index);
+	else
+		devm_iounremap_resource(&pdev->dev, r, addr);
+}
+EXPORT_SYMBOL_GPL(devm_platform_iounremap_resource);
+
 /**
  * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
  *				    device
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 77a2aada106d..75da15937679 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -67,6 +67,10 @@ devm_platform_ioremap_resource_wc(struct platform_device *pdev,
 extern void __iomem *
 devm_platform_ioremap_resource_byname(struct platform_device *pdev,
 				      const char *name);
+extern void
+devm_platform_iounremap_resource(struct platform_device *pdev,
+				 unsigned int index,
+				 void __iomem *addr);
 extern int platform_get_irq(struct platform_device *, unsigned int);
 extern int platform_get_irq_optional(struct platform_device *, unsigned int);
 extern int platform_irq_count(struct platform_device *);
-- 
2.17.1