soc: loongson: loongson2_guts: Convert to devm_platform_ioremap_resource()

Use devm_platform_ioremap_resource() to simplify code.

Signed-off-by: Dongliang Mu <dzm91@hust.edu.cn>
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Author: mudongliang

drivers/soc/loongson/loongson2_guts.c

@@ -94,7 +94,6 @@ static int loongson2_guts_probe(struct platform_device *pdev)
 {
 	struct device_node *root, *np = pdev->dev.of_node;
 	struct device *dev = &pdev->dev;
-	struct resource *res;
 	const struct loongson2_soc_die_attr *soc_die;
 	const char *machine;
 	u32 svr;
@@ -106,8 +105,7 @@ static int loongson2_guts_probe(struct platform_device *pdev)
 
 	guts->little_endian = of_property_read_bool(np, "little-endian");
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	guts->regs = ioremap(res->start, res->end - res->start + 1);
+	guts->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(guts->regs))
 		return PTR_ERR(guts->regs);