linux-kernel - [PATCH V2] rtc: rtc-jz4740: Use devm_ioremap

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Message-id: <003801cf25f7$89791f40$9c6b5dc0$%han@samsung.com>
Date:	Mon, 10 Feb 2014 09:32:10 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Andrew Morton' <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	'Alessandro Zummo' <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, 'Lars-Peter Clausen' <lars@...afoo.de>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: [PATCH V2] rtc: rtc-jz4740: Use devm_ioremap_resource()

Use devm_ioremap_resource() in order to make the code simpler,
and move 'struct resource *mem' from 'struct jz4740_rtc' to
jz4740_rtc_probe() because the 'mem' variable is used only in
jz4740_rtc_probe(). Also the redundant return value check of
platform_get_resource() is removed, because the value is checked
by devm_ioremap_resource().

Signed-off-by: Jingoo Han <jg1.han@...sung.com>
---
Changes since v1
- Removed unnecessary resource flag setting, per Lars-Peter Clausen
- Removed unnecessary the return value check of platform_get_resource()

 drivers/rtc/rtc-jz4740.c |   25 +++++--------------------
 1 file changed, 5 insertions(+), 20 deletions(-)

diff --git a/drivers/rtc/rtc-jz4740.c b/drivers/rtc/rtc-jz4740.c
index 1b126d2..08f5160 100644
--- a/drivers/rtc/rtc-jz4740.c
+++ b/drivers/rtc/rtc-jz4740.c
@@ -38,7 +38,6 @@
 #define JZ_RTC_CTRL_ENABLE	BIT(0)
 
 struct jz4740_rtc {
-	struct resource *mem;
 	void __iomem *base;
 
 	struct rtc_device *rtc;
@@ -216,6 +215,7 @@ static int jz4740_rtc_probe(struct platform_device *pdev)
 	int ret;
 	struct jz4740_rtc *rtc;
 	uint32_t scratchpad;
+	struct resource *mem;
 
 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
 	if (!rtc)
@@ -227,25 +227,10 @@ static int jz4740_rtc_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
-	rtc->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!rtc->mem) {
-		dev_err(&pdev->dev, "Failed to get platform mmio memory\n");
-		return -ENOENT;
-	}
-
-	rtc->mem = devm_request_mem_region(&pdev->dev, rtc->mem->start,
-					resource_size(rtc->mem), pdev->name);
-	if (!rtc->mem) {
-		dev_err(&pdev->dev, "Failed to request mmio memory region\n");
-		return -EBUSY;
-	}
-
-	rtc->base = devm_ioremap_nocache(&pdev->dev, rtc->mem->start,
-					resource_size(rtc->mem));
-	if (!rtc->base) {
-		dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
-		return -EBUSY;
-	}
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	rtc->base = devm_ioremap_resource(&pdev->dev, mem);
+	if (IS_ERR(rtc->base))
+		return PTR_ERR(rtc->base);
 
 	spin_lock_init(&rtc->lock);
 
-- 
1.7.10.4


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