i2c: octeon: Cleanup resource allocation code

BugLink: https://bugs.launchpad.net/bugs/1688132

Remove resource values from struct i2c_octeon and use
devm_ioremap_resource helper.
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
(cherry picked from commit 54108e56)
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Acked-by: Colin King <colin.king@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

drivers/i2c/busses/i2c-octeon.c

@@ -75,9 +75,7 @@ struct octeon_i2c {
 	int irq;
 	u32 twsi_freq;
 	int sys_freq;
-	resource_size_t twsi_phys;
 	void __iomem *twsi_base;
-	resource_size_t regsize;
 	struct device *dev;
 };
 
@@ -502,14 +500,11 @@ static int octeon_i2c_probe(struct platform_device *pdev)
 	i2c->dev = &pdev->dev;
 
 	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
-	if (res_mem == NULL) {
-		dev_err(i2c->dev, "found no memory resource\n");
-		result = -ENXIO;
+	i2c->twsi_base = devm_ioremap_resource(&pdev->dev, res_mem);
+	if (IS_ERR(i2c->twsi_base)) {
+		result = PTR_ERR(i2c->twsi_base);
 		goto out;
 	}
-	i2c->twsi_phys = res_mem->start;
-	i2c->regsize = resource_size(res_mem);
 
 	/*
 	 * "clock-rate" is a legacy binding, the official binding is
@@ -526,13 +521,6 @@ static int octeon_i2c_probe(struct platform_device *pdev)
 
 	i2c->sys_freq = octeon_get_io_clock_rate();
 
-	if (!devm_request_mem_region(&pdev->dev, i2c->twsi_phys, i2c->regsize,
-				     res_mem->name)) {
-		dev_err(i2c->dev, "request_mem_region failed\n");
-		goto out;
-	}
-	i2c->twsi_base = devm_ioremap(&pdev->dev, i2c->twsi_phys, i2c->regsize);
-
 	init_waitqueue_head(&i2c->queue);
 
 	i2c->irq = irq;