[PATCH V11 7/8] irqchip/gicv3-its: Factor out PCI-MSI part that might be reused for ACPI

[Tomasz Nowicki]

Firmware agnostic code lands in common functions which do necessary
domain initialization based on unique domain handler. DT specific
code goes to DT specific init call.

Signed-off-by: Tomasz Nowicki <t...@semihalf.com>
Acked-by: Marc Zyngier <marc.zyng...@arm.com>
---
 drivers/irqchip/irq-gic-v3-its-pci-msi.c | 44 +++++++++++++++++++++-----------
 1 file changed, 29 insertions(+), 15 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its-pci-msi.c 
b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
index aee60ed..d2c2496 100644
--- a/drivers/irqchip/irq-gic-v3-its-pci-msi.c
+++ b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
@@ -106,34 +106,48 @@ static struct of_device_id its_device_id[] = {
        {},
 };
 
-static int __init its_pci_msi_init(void)
+static int __init its_pci_msi_init_one(struct fwnode_handle *handle,
+                                      const char *name)
 {
-       struct device_node *np;
        struct irq_domain *parent;
 
+       parent = irq_find_matching_fwnode(handle, DOMAIN_BUS_NEXUS);
+       if (!parent || !msi_get_domain_info(parent)) {
+               pr_err("%s: Unable to locate ITS domain\n", name);
+               return -ENXIO;
+       }
+
+       if (!pci_msi_create_irq_domain(handle, &its_pci_msi_domain_info,
+                                      parent)) {
+               pr_err("%s: Unable to create PCI domain\n", name);
+               return -ENOMEM;
+       }
+
+       return 0;
+}
+
+static int __init its_pci_of_msi_init(void)
+{
+       struct device_node *np;
+
        for (np = of_find_matching_node(NULL, its_device_id); np;
             np = of_find_matching_node(np, its_device_id)) {
                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("%s: unable to locate ITS domain\n",
-                              np->full_name);
+               if (its_pci_msi_init_one(of_node_to_fwnode(np), np->full_name))
                        continue;
-               }
-
-               if (!pci_msi_create_irq_domain(of_node_to_fwnode(np),
-                                              &its_pci_msi_domain_info,
-                                              parent)) {
-                       pr_err("%s: unable to create PCI domain\n",
-                              np->full_name);
-                       continue;
-               }
 
                pr_info("PCI/MSI: %s domain created\n", np->full_name);
        }
 
        return 0;
 }
+
+static int __init its_pci_msi_init(void)
+{
+       its_pci_of_msi_init();
+
+       return 0;
+}
 early_initcall(its_pci_msi_init);
-- 
1.9.1