[PATCH 04/10] irqchip/irq-gic-v3-its-fsl-mc-msi: Remove domain init order dependencies

[Robert Richter]

Use new irq_domain_request_host_*() interface which allows independent
parent and child initialization using an irq domain request handler.
This makes it possible to move its initialization to a later point
during boot. All domains can be initialized in the same initcall level
then.

Signed-off-by: Robert Richter <rrich...@cavium.com>
---
 drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c | 47 ++++++++++++++++++-----------
 1 file changed, 29 insertions(+), 18 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c 
b/drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c
index 606efa64adff..0e9b31f13618 100644
--- a/drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c
+++ b/drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c
@@ -66,11 +66,34 @@ static const struct of_device_id its_device_id[] = {
        {},
 };
 
+static int __init its_fsl_create_irq_domain(struct irq_domain *parent,
+                                       void *priv)
+{
+       struct device_node *np = irq_domain_get_of_node(parent);
+       struct irq_domain *mc_msi_domain;
+
+       if (!msi_get_domain_info(parent)) {
+               pr_err("%pOF: unable to locate ITS domain\n", np);
+               return -ENXIO;
+       }
+
+       mc_msi_domain = fsl_mc_msi_create_irq_domain(parent->fwnode,
+                                               &its_fsl_mc_msi_domain_info,
+                                               parent);
+       if (!mc_msi_domain) {
+               pr_err("%pOF: unable to create fsl-mc domain\n", np);
+               return -ENOMEM;
+       }
+
+       pr_info("fsl-mc MSI: %pOF domain created\n", np);
+
+       return 0;
+}
+
 static int __init its_fsl_mc_msi_init(void)
 {
        struct device_node *np;
-       struct irq_domain *parent;
-       struct irq_domain *mc_msi_domain;
+       int ret = 0;
 
        for (np = of_find_matching_node(NULL, its_device_id); np;
             np = of_find_matching_node(np, its_device_id)) {
@@ -79,22 +102,10 @@ static int __init its_fsl_mc_msi_init(void)
                if (!of_property_read_bool(np, "msi-controller"))
                        continue;
 
-               parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
-               if (!parent || !msi_get_domain_info(parent)) {
-                       pr_err("%pOF: unable to locate ITS domain\n", np);
-                       continue;
-               }
-
-               mc_msi_domain = fsl_mc_msi_create_irq_domain(
-                                                of_node_to_fwnode(np),
-                                                &its_fsl_mc_msi_domain_info,
-                                                parent);
-               if (!mc_msi_domain) {
-                       pr_err("%pOF: unable to create fsl-mc domain\n", np);
-                       continue;
-               }
-
-               pr_info("fsl-mc MSI: %pOF domain created\n", np);
+               ret = irq_domain_request_host(np, DOMAIN_BUS_NEXUS,
+                                               its_fsl_create_irq_domain, 
NULL);
+               if (ret)
+                       pr_err("%pOF: unable to register ITS domain\n", np);
        }
 
        return 0;
-- 
2.11.0