serial: amba-pl010: Use devres APIs

Migrating to use devres managed APIs devm_kzalloc, devm_ioremap and
devm_clk_get.
Signed-off-by: NTushar Behera <tushar.b@samsung.com>
Reviewed-by: NDaniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/amba-pl010.c

@@ -46,8 +46,7 @@
 #include <linux/amba/serial.h>
 #include <linux/clk.h>
 #include <linux/slab.h>
-
-#include <asm/io.h>
+#include <linux/io.h>
 
 #define UART_NR		8
 
@@ -688,28 +687,22 @@ static int pl010_probe(struct amba_device *dev, const struct amba_id *id)
 		if (amba_ports[i] == NULL)
 			break;
 
-	if (i == ARRAY_SIZE(amba_ports)) {
-		ret = -EBUSY;
-		goto out;
-	}
+	if (i == ARRAY_SIZE(amba_ports))
+		return -EBUSY;
 
-	uap = kzalloc(sizeof(struct uart_amba_port), GFP_KERNEL);
-	if (!uap) {
-		ret = -ENOMEM;
-		goto out;
-	}
+	uap = devm_kzalloc(&dev->dev, sizeof(struct uart_amba_port),
+			   GFP_KERNEL);
+	if (!uap)
+		return -ENOMEM;
 
-	base = ioremap(dev->res.start, resource_size(&dev->res));
-	if (!base) {
-		ret = -ENOMEM;
-		goto free;
-	}
+	base = devm_ioremap(&dev->dev, dev->res.start,
+			    resource_size(&dev->res));
+	if (!base)
+		return -ENOMEM;
 
-	uap->clk = clk_get(&dev->dev, NULL);
-	if (IS_ERR(uap->clk)) {
-		ret = PTR_ERR(uap->clk);
-		goto unmap;
-	}
+	uap->clk = devm_clk_get(&dev->dev, NULL);
+	if (IS_ERR(uap->clk))
+		return PTR_ERR(uap->clk);
 
 	uap->port.dev = &dev->dev;
 	uap->port.mapbase = dev->res.start;
@@ -727,15 +720,9 @@ static int pl010_probe(struct amba_device *dev, const struct amba_id *id)
 
 	amba_set_drvdata(dev, uap);
 	ret = uart_add_one_port(&amba_reg, &uap->port);
-	if (ret) {
+	if (ret)
 		amba_ports[i] = NULL;
-		clk_put(uap->clk);
- unmap:
-		iounmap(base);
- free:
-		kfree(uap);
-	}
- out:
+
 	return ret;
 }
 
@@ -750,9 +737,6 @@ static int pl010_remove(struct amba_device *dev)
 		if (amba_ports[i] == uap)
 			amba_ports[i] = NULL;
 
-	iounmap(uap->port.membase);
-	clk_put(uap->clk);
-	kfree(uap);
 	return 0;
 }