ata: ahci_mvebu: add support for Armada 3700 variant

The main difference in the new Armada 3700 is that no address
decoding needs to take place in the driver probe.

[gregory.clement@free-electrons.com: reformulate the commit log]
Signed-off-by: Lior Amsalem <alior@marvell.com>
Reviewed-by: Nadav Haklai <nadavh@marvell.com>
Tested-by: Nadav Haklai <nadavh@marvell.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

drivers/ata/ahci_mvebu.c

@@ -112,12 +112,15 @@ static int ahci_mvebu_probe(struct platform_device *pdev)
 	if (rc)
 		return rc;
 
-	dram = mv_mbus_dram_info();
-	if (!dram)
-		return -ENODEV;
+	if (of_device_is_compatible(pdev->dev.of_node,
+				    "marvell,armada-380-ahci")) {
+		dram = mv_mbus_dram_info();
+		if (!dram)
+			return -ENODEV;
 
-	ahci_mvebu_mbus_config(hpriv, dram);
-	ahci_mvebu_regret_option(hpriv);
+		ahci_mvebu_mbus_config(hpriv, dram);
+		ahci_mvebu_regret_option(hpriv);
+	}
 
 	rc = ahci_platform_init_host(pdev, hpriv, &ahci_mvebu_port_info,
 				     &ahci_platform_sht);
@@ -133,6 +136,7 @@ static int ahci_mvebu_probe(struct platform_device *pdev)
 
 static const struct of_device_id ahci_mvebu_of_match[] = {
 	{ .compatible = "marvell,armada-380-ahci", },
+	{ .compatible = "marvell,armada-3700-ahci", },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, ahci_mvebu_of_match);