Merge tag 'renesas-fixes-for-v4.18' of...

Merge tag 'renesas-fixes-for-v4.18' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into fixes

Renesas ARM Based SoC Fixes for v4.18

Make PM domain initialization more robust in Renesas R-Car SYSC driver.
This resolves a regression due to re-parenting of PM domains by
086b3999 ("soc: renesas: r8a77990-sysc: Add workaround for 3DG-{A,B}").

* tag 'renesas-fixes-for-v4.18' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
  soc: renesas: rcar-sysc: Make PM domain initialization more robust
Signed-off-by: Olof Johansson <olof@lixom.net>

drivers/soc/renesas/rcar-sysc.c

@@ -194,11 +194,12 @@ static int rcar_sysc_pd_power_on(struct generic_pm_domain *genpd)
 
 static bool has_cpg_mstp;
 
-static void __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd)
+static int __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd)
 {
 	struct generic_pm_domain *genpd = &pd->genpd;
 	const char *name = pd->genpd.name;
 	struct dev_power_governor *gov = &simple_qos_governor;
+	int error;
 
 	if (pd->flags & PD_CPU) {
 		/*
@@ -251,7 +252,11 @@ static void __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd)
 	rcar_sysc_power_up(&pd->ch);
 
 finalize:
-	pm_genpd_init(genpd, gov, false);
+	error = pm_genpd_init(genpd, gov, false);
+	if (error)
+		pr_err("Failed to init PM domain %s: %d\n", name, error);
+
+	return error;
 }
 
 static const struct of_device_id rcar_sysc_matches[] __initconst = {
@@ -375,6 +380,9 @@ static int __init rcar_sysc_pd_init(void)
 	pr_debug("%pOF: syscier = 0x%08x\n", np, syscier);
 	iowrite32(syscier, base + SYSCIER);
 
+	/*
+	 * First, create all PM domains
+	 */
 	for (i = 0; i < info->num_areas; i++) {
 		const struct rcar_sysc_area *area = &info->areas[i];
 		struct rcar_sysc_pd *pd;
@@ -397,14 +405,29 @@ static int __init rcar_sysc_pd_init(void)
 		pd->ch.isr_bit = area->isr_bit;
 		pd->flags = area->flags;
 
-		rcar_sysc_pd_setup(pd);
-		if (area->parent >= 0)
-			pm_genpd_add_subdomain(domains->domains[area->parent],
-					       &pd->genpd);
+		error = rcar_sysc_pd_setup(pd);
+		if (error)
+			goto out_put;
 
 		domains->domains[area->isr_bit] = &pd->genpd;
 	}
 
+	/*
+	 * Second, link all PM domains to their parents
+	 */
+	for (i = 0; i < info->num_areas; i++) {
+		const struct rcar_sysc_area *area = &info->areas[i];
+
+		if (!area->name || area->parent < 0)
+			continue;
+
+		error = pm_genpd_add_subdomain(domains->domains[area->parent],
+					       domains->domains[area->isr_bit]);
+		if (error)
+			pr_warn("Failed to add PM subdomain %s to parent %u\n",
+				area->name, area->parent);
+	}
+
 	error = of_genpd_add_provider_onecell(np, &domains->onecell_data);
 
 out_put: