Hi Lina,

On Fri, Jul 29, 2016 at 03:56:17PM -0600, Lina Iyer wrote:

+static struct generic_pm_domain *of_get_cpu_domain(struct device_node *dn,
+		const struct cpu_pd_ops *ops, int cpu)
+{
+	struct of_phandle_args args;
+	struct generic_pm_domain *genpd, *parent;
+	struct cpu_pm_domain *cpu_pd, *parent_cpu_pd;
+	int ret;
+
+	/* Do we have this domain? If not, create the domain */
+	args.np = dn;
+	args.args_count = 0;
+
+	genpd = of_genpd_get_from_provider(&args);
+	if (!IS_ERR(genpd))
+		return genpd;
+
+	genpd = of_init_cpu_pm_domain(dn, ops);
+	if (IS_ERR(genpd))
+		return genpd;
+
+	/* Is there a domain provider for this domain? */
+	ret = of_parse_phandle_with_args(dn, "power-domains",
+			"#power-domain-cells", 0, &args);
+	if (ret < 0)
+		goto skip_parent;
+
+	/* Find its parent and attach this domain to it, recursively */
+	parent = of_get_cpu_domain(args.np, ops, cpu);
+	if (IS_ERR(parent))
+		goto skip_parent;
+
+	ret = pm_genpd_add_subdomain(genpd, parent);

Looks like the arguments are the wrong way around here, it should be:

	ret = pm_genpd_add_subdomain(parent, genpd);

+	if (ret) {
+		pr_err("%s: Unable to add sub-domain (%s)\n err: %d",
+				__func__, genpd->name, ret);
+		return ERR_PTR(ret);
+	}
+
+	/*
+	 * Reference parent domain for easy access.
+	 * Note: We could be attached to a domain that is not a
+	 * CPU PM domain in that case don't reference the parent.
+	 */
+	cpu_pd = to_cpu_pd(genpd);
+	parent_cpu_pd = to_cpu_pd(parent);
+
+	if (cpu_pd && parent_cpu_pd)
+		cpu_pd->parent = parent_cpu_pd;
+
+skip_parent:
+	of_node_put(dn);
+	return genpd;
+}

Cheers,
Brendan