[PATCH 1/3] platform: add common resource requesting and mapping helper

[Barry Song]

From: Barry Song <Baohua.Song@xxxxxxx>

this patch helps to move the common pattern from

"
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
	ret = -ENODEV;
	goto err;
}

base = devm_request_and_ioremap(&dev->dev, mem_res);
if (!base) {
	ret = -ENODEV;
	goto err;
}
"

to

"
base = platform_devm_request_and_ioremap(pdev, 0);
if (!base) {
	ret = -ENODEV;
	goto err;
}
"

Signed-off-by: Barry Song <Baohua.Song@xxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Erik Gilling <konkers@xxxxxxxxxx>
Cc: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
---
 drivers/base/platform.c         |   19 +++++++++++++++++++
 include/linux/platform_device.h |    1 +
 2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index f0c605e..39ca0ab 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -72,6 +72,25 @@ struct resource *platform_get_resource(struct platform_device *dev,
 EXPORT_SYMBOL_GPL(platform_get_resource);
 
 /**
+ * platform_devm_request_and_ioremap() - get resource, check, request region,
+ * and ioremap resource
+ * @dev: platform device
+ * @num: IOMEM resource index
+ */
+void __iomem *platform_devm_request_and_ioremap(struct platform_device *dev,
+	unsigned int num)
+{
+	struct resource *res;
+
+	res = platform_get_resource(dev, IORESOURCE_MEM, num);
+	if (!res)
+		return NULL;
+
+	return devm_request_and_ioremap(&dev->dev, res);
+}
+EXPORT_SYMBOL_GPL(platform_devm_request_and_ioremap);
+
+/**
  * platform_get_irq - get an IRQ for a device
  * @dev: platform device
  * @num: IRQ number index
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 60e9994..768c0d7 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -44,6 +44,7 @@ extern struct device platform_bus;
 
 extern void arch_setup_pdev_archdata(struct platform_device *);
 extern struct resource *platform_get_resource(struct platform_device *, unsigned int, unsigned int);
+extern void __iomem *platform_devm_request_and_ioremap(struct platform_device *, unsigned int);
 extern int platform_get_irq(struct platform_device *, unsigned int);
 extern struct resource *platform_get_resource_byname(struct platform_device *, unsigned int, const char *);
 extern int platform_get_irq_byname(struct platform_device *, const char *);
-- 
1.7.1



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