irqchip/loongson-pch-msi.c: Switch to msi_create_parent_irq_domain()

Switch to use the concise helper to create an MSI parent domain.

Signed-off-by: Thomas Gleixner <[e-mail]>
Signed-off-by: Nam Cao <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Link: https://lore.kernel.org/all/[e-mail]

drivers/irqchip/irq-loongson-pch-msi.c

···
 	.init_dev_msi_info	= msi_lib_init_dev_msi_info,
 };
 
-static int pch_msi_init_domains(struct pch_msi_data *priv,
-				struct irq_domain *parent,
+static int pch_msi_init_domains(struct pch_msi_data *priv, struct irq_domain *parent,
 				struct fwnode_handle *domain_handle)
 {
-	struct irq_domain *middle_domain;
+	struct irq_domain_info info = {
+		.ops		= &pch_msi_middle_domain_ops,
+		.size		= priv->num_irqs,
+		.parent		= parent,
+		.host_data	= priv,
+		.fwnode		= domain_handle,
+	};
 
-	middle_domain = irq_domain_create_hierarchy(parent, 0, priv->num_irqs,
-						    domain_handle,
-						    &pch_msi_middle_domain_ops,
-						    priv);
-	if (!middle_domain) {
+	if (!msi_create_parent_irq_domain(&info, &pch_msi_parent_ops)) {
 		pr_err("Failed to create the MSI middle domain\n");
 		return -ENOMEM;
 	}
-
-	irq_domain_update_bus_token(middle_domain, DOMAIN_BUS_NEXUS);
-
-	middle_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
-	middle_domain->msi_parent_ops = &pch_msi_parent_ops;
-
 	return 0;
 }