Merge tag 'renesas-soc3-for-v3.20' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into next/soc

Merge "Third Round of Renesas ARM Based SoC Updates for v3.20" from Simon
Horman:

* Special-case PM domains with memory-controllers

* tag 'renesas-soc3-for-v3.20' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
  ARM: shmobile: R-Mobile: Special-case PM domains with memory-controllers
  ARM: shmobile: R-Mobile: Generalize adding/looking up special PM domains
  ARM: shmobile: R-Mobile: Consolidate rmobile_pd_suspend_*()

Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-shmobile/pm-rmobile.c

@@ -200,11 +200,10 @@ void rmobile_add_devices_to_domains(struct pm_domain_device data[],
 
 #else /* !CONFIG_ARCH_SHMOBILE_LEGACY */
 
-static int rmobile_pd_suspend_cpu(void)
+static int rmobile_pd_suspend_busy(void)
 {
 	/*
-	 * This domain contains the CPU core and therefore it should
-	 * only be turned off if the CPU is not in use.
+	 * This domain should not be turned off.
 	 */
 	return -EBUSY;
 }
@@ -218,83 +217,95 @@ static int rmobile_pd_suspend_console(void)
 	return console_suspend_enabled ? 0 : -EBUSY;
 }
 
-static int rmobile_pd_suspend_debug(void)
-{
-	/*
-	 * This domain contains the Coresight-ETM hardware block and
-	 * therefore it should only be turned off if the debug module is
-	 * not in use.
-	 */
-	return -EBUSY;
-}
+enum pd_types {
+	PD_NORMAL,
+	PD_CPU,
+	PD_CONSOLE,
+	PD_DEBUG,
+	PD_MEMCTL,
+};
 
-#define MAX_NUM_CPU_PDS		8
+#define MAX_NUM_SPECIAL_PDS	16
 
-static unsigned int num_cpu_pds __initdata;
-static struct device_node *cpu_pds[MAX_NUM_CPU_PDS] __initdata;
-static struct device_node *console_pd __initdata;
-static struct device_node *debug_pd __initdata;
+static struct special_pd {
+	struct device_node *pd;
+	enum pd_types type;
+} special_pds[MAX_NUM_SPECIAL_PDS] __initdata;
 
-static void __init get_special_pds(void)
+static unsigned int num_special_pds __initdata;
+
+static const struct of_device_id special_ids[] __initconst = {
+	{ .compatible = "arm,coresight-etm3x", .data = (void *)PD_DEBUG },
+	{ .compatible = "renesas,dbsc-r8a73a4", .data = (void *)PD_MEMCTL, },
+	{ .compatible = "renesas,dbsc3-r8a7740", .data = (void *)PD_MEMCTL, },
+	{ .compatible = "renesas,sbsc-sh73a0", .data = (void *)PD_MEMCTL, },
+	{ /* sentinel */ },
+};
+
+static void __init add_special_pd(struct device_node *np, enum pd_types type)
 {
-	struct device_node *np, *pd;
 	unsigned int i;
+	struct device_node *pd;
 
-	/* PM domains containing CPUs */
-	for_each_node_by_type(np, "cpu") {
-		pd = of_parse_phandle(np, "power-domains", 0);
-		if (!pd)
-			continue;
-
-		for (i = 0; i < num_cpu_pds; i++)
-			if (pd == cpu_pds[i])
-				break;
+	pd = of_parse_phandle(np, "power-domains", 0);
+	if (!pd)
+		return;
 
-		if (i < num_cpu_pds) {
+	for (i = 0; i < num_special_pds; i++)
+		if (pd == special_pds[i].pd && type == special_pds[i].type) {
 			of_node_put(pd);
-			continue;
+			return;
 		}
 
-		if (num_cpu_pds == MAX_NUM_CPU_PDS) {
-			pr_warn("Too many CPU PM domains\n");
-			of_node_put(pd);
-			continue;
-		}
-
-		cpu_pds[num_cpu_pds++] = pd;
+	if (num_special_pds == ARRAY_SIZE(special_pds)) {
+		pr_warn("Too many special PM domains\n");
+		of_node_put(pd);
+		return;
 	}
 
+	pr_debug("Special PM domain %s type %d for %s\n", pd->name, type,
+		 np->full_name);
+
+	special_pds[num_special_pds].pd = pd;
+	special_pds[num_special_pds].type = type;
+	num_special_pds++;
+}
+
+static void __init get_special_pds(void)
+{
+	struct device_node *np;
+	const struct of_device_id *id;
+
+	/* PM domains containing CPUs */
+	for_each_node_by_type(np, "cpu")
+		add_special_pd(np, PD_CPU);
+
 	/* PM domain containing console */
 	if (of_stdout)
-		console_pd = of_parse_phandle(of_stdout, "power-domains", 0);
+		add_special_pd(of_stdout, PD_CONSOLE);
 
-	/* PM domain containing Coresight-ETM */
-	np = of_find_compatible_node(NULL, NULL, "arm,coresight-etm3x");
-	if (np) {
-		debug_pd = of_parse_phandle(np, "power-domains", 0);
-		of_node_put(np);
-	}
+	/* PM domains containing other special devices */
+	for_each_matching_node_and_match(np, special_ids, &id)
+		add_special_pd(np, (enum pd_types)id->data);
 }
 
 static void __init put_special_pds(void)
 {
 	unsigned int i;
 
-	for (i = 0; i < num_cpu_pds; i++)
-		of_node_put(cpu_pds[i]);
-	of_node_put(console_pd);
-	of_node_put(debug_pd);
+	for (i = 0; i < num_special_pds; i++)
+		of_node_put(special_pds[i].pd);
 }
 
-static bool __init pd_contains_cpu(const struct device_node *pd)
+static enum pd_types __init pd_type(const struct device_node *pd)
 {
 	unsigned int i;
 
-	for (i = 0; i < num_cpu_pds; i++)
-		if (pd == cpu_pds[i])
-			return true;
+	for (i = 0; i < num_special_pds; i++)
+		if (pd == special_pds[i].pd)
+			return special_pds[i].type;
 
-	return false;
+	return PD_NORMAL;
 }
 
 static void __init rmobile_setup_pm_domain(struct device_node *np,
@@ -302,18 +313,46 @@ static void __init rmobile_setup_pm_domain(struct device_node *np,
 {
 	const char *name = pd->genpd.name;
 
-	if (pd_contains_cpu(np)) {
+	switch (pd_type(np)) {
+	case PD_CPU:
+		/*
+		 * This domain contains the CPU core and therefore it should
+		 * only be turned off if the CPU is not in use.
+		 */
 		pr_debug("PM domain %s contains CPU\n", name);
 		pd->gov = &pm_domain_always_on_gov;
-		pd->suspend = rmobile_pd_suspend_cpu;
-	} else if (np == console_pd) {
+		pd->suspend = rmobile_pd_suspend_busy;
+		break;
+
+	case PD_CONSOLE:
 		pr_debug("PM domain %s contains serial console\n", name);
 		pd->gov = &pm_domain_always_on_gov;
 		pd->suspend = rmobile_pd_suspend_console;
-	} else if (np == debug_pd) {
+		break;
+
+	case PD_DEBUG:
+		/*
+		 * This domain contains the Coresight-ETM hardware block and
+		 * therefore it should only be turned off if the debug module
+		 * is not in use.
+		 */
 		pr_debug("PM domain %s contains Coresight-ETM\n", name);
 		pd->gov = &pm_domain_always_on_gov;
-		pd->suspend = rmobile_pd_suspend_debug;
+		pd->suspend = rmobile_pd_suspend_busy;
+		break;
+
+	case PD_MEMCTL:
+		/*
+		 * This domain contains a memory-controller and therefore it
+		 * should only be turned off if memory is not in use.
+		 */
+		pr_debug("PM domain %s contains MEMCTL\n", name);
+		pd->gov = &pm_domain_always_on_gov;
+		pd->suspend = rmobile_pd_suspend_busy;
+		break;
+
+	case PD_NORMAL:
+		break;
 	}
 
 	rmobile_init_pm_domain(pd);