linux-kernel - [PATCH v3 1/5] drivers: provide devm_platform_get_and_ioremap

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Message-Id: <20200315140525.21780-2-zhengdejin5@gmail.com>
Date:   Sun, 15 Mar 2020 22:05:21 +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,
        jeffrey.t.kirsher@...el.com, hdegoede@...hat.com,
        treding@...dia.com, tglx@...utronix.de, tomas.winkler@...el.com,
        suzuki.poulose@....com, sergei.shtylyov@...entembedded.com,
        geert@...ux-m68k.org, linux-usb@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dejin Zheng <zhengdejin5@...il.com>
Subject: [PATCH v3 1/5] drivers: provide devm_platform_get_and_ioremap_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.

Suggested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Suggested-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
---
v2 -> v3:
	- rename the function to
	  devm_platform_get_and_ioremap_resource() by Sergei's suggestion.
	- make the last parameter res as optional by Geert's suggestion.

v1 -> v2:
	- No change.

 drivers/base/platform.c         | 22 ++++++++++++++++++++++
 include/linux/platform_device.h |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 7fa654f1288b..9f6a78f79235 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -62,6 +62,28 @@ struct resource *platform_get_resource(struct platform_device *dev,
 EXPORT_SYMBOL_GPL(platform_get_resource);
 
 #ifdef CONFIG_HAS_IOMEM
+/**
+ * devm_platform_get_and_ioremap_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_get_and_ioremap_resource(struct platform_device *pdev,
+				unsigned int index, struct resource **res)
+{
+	struct resource *r;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, index);
+	if (res)
+		*res = r;
+	return devm_ioremap_resource(&pdev->dev, r);
+}
+EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_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 8e83c6ff140d..8aa6b448450f 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_get_and_ioremap_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