i2c: mxs: Use devm_ioremap_resource()

Use devm_ioremap_resource() in order to make the code simpler,
and remove redundant return value check of platform_get_resource()
because the value is checked by devm_ioremap_resource().
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-mxs.c

@@ -806,7 +806,6 @@ static int mxs_i2c_probe(struct platform_device *pdev)
 	struct mxs_i2c_dev *i2c;
 	struct i2c_adapter *adap;
 	struct resource *res;
-	resource_size_t res_size;
 	int err, irq;
 
 	i2c = devm_kzalloc(dev, sizeof(struct mxs_i2c_dev), GFP_KERNEL);
@@ -819,18 +818,13 @@ static int mxs_i2c_probe(struct platform_device *pdev)
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	irq = platform_get_irq(pdev, 0);
-
-	if (!res || irq < 0)
-		return -ENOENT;
+	i2c->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(i2c->regs))
+		return PTR_ERR(i2c->regs);
 
-	res_size = resource_size(res);
-	if (!devm_request_mem_region(dev, res->start, res_size, res->name))
-		return -EBUSY;
-
-	i2c->regs = devm_ioremap_nocache(dev, res->start, res_size);
-	if (!i2c->regs)
-		return -EBUSY;
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
 
 	err = devm_request_irq(dev, irq, mxs_i2c_isr, 0, dev_name(dev), i2c);
 	if (err)