ARM: mvebu: make the cpuidle initialization more generic

In preparation to the addition of the cpuidle support for more SoCs,
this patch moves the Armada XP specific initialization to a separate
function.
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1406120453-29291-7-git-send-email-thomas.petazzoni@free-electrons.comSigned-off-by: NJason Cooper <jason@lakedaemon.net>

arch/arm/mach-mvebu/pmsu.c

@@ -311,31 +311,39 @@ static struct notifier_block mvebu_v7_cpu_pm_notifier = {
 	.notifier_call = mvebu_v7_cpu_pm_notify,
 };
 
-static int __init mvebu_v7_cpu_pm_init(void)
+static int __init armada_xp_cpuidle_init(void)
 {
 	struct device_node *np;
 
-	/*
-	 * Check that all the requirements are available to enable
-	 * cpuidle. So far, it is only supported on Armada XP, cpuidle
-	 * needs the coherency fabric and the PMSU enabled
-	 */
-
-	if (!of_machine_is_compatible("marvell,armadaxp"))
-		return 0;
-
 	np = of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric");
 	if (!np)
-		return 0;
+		return -ENODEV;
 	of_node_put(np);
 
+	mvebu_v7_cpuidle_device.dev.platform_data = armada_370_xp_cpu_suspend;
+
+	return 0;
+}
+
+static int __init mvebu_v7_cpu_pm_init(void)
+{
+	struct device_node *np;
+	int ret;
+
 	np = of_find_matching_node(NULL, of_pmsu_table);
 	if (!np)
 		return 0;
 	of_node_put(np);
 
+	if (of_machine_is_compatible("marvell,armadaxp"))
+		ret = armada_xp_cpuidle_init();
+	else
+		return 0;
+
+	if (ret)
+		return ret;
+
 	mvebu_v7_pmsu_enable_l2_powerdown_onidle();
-	mvebu_v7_cpuidle_device.dev.platform_data = armada_370_xp_cpu_suspend;
 	platform_device_register(&mvebu_v7_cpuidle_device);
 	cpu_pm_register_notifier(&mvebu_v7_cpu_pm_notifier);