linux-kernel - [PATCH v2 1/4] drivers: provide devm_platform_ioremap_and_get

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Date:   Sat, 14 Mar 2020 13:26:35 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     gregkh@...uxfoundation.org, rafael@...nel.org, hminas@...opsys.com,
        mathias.nyman@...el.com, bgolaszewski@...libre.com, arnd@...db.de,
        geert@...ux-m68k.org, mchehab+samsung@...nel.org,
        treding@...dia.com, tglx@...utronix.de, suzuki.poulose@....com,
        hdegoede@...hat.com, linux-usb@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dejin Zheng <zhengdejin5@...il.com>
Subject: [PATCH v2 1/4] 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 ++++++++++++++++++
 include/linux/platform_device.h |  3 +++
 2 files changed, 21 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
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 276a03c24691..5fd1977e3eaf 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -55,6 +55,9 @@ extern struct device *
 platform_find_device_by_driver(struct device *start,
 			       const struct device_driver *drv);
 extern void __iomem *
+devm_platform_ioremap_and_get_resource(struct platform_device *pdev,
+				unsigned int index, struct resource **res);
+extern void __iomem *
 devm_platform_ioremap_resource(struct platform_device *pdev,
 			       unsigned int index);
 extern void __iomem *
-- 
2.25.0