irqchip/gic-v3-its: Parse new version of msi-parent property

Now that 126b16e2ad98 ("Docs: dt: add generic MSI bindings")
has made it into the tree, the time has come to get rid of the
old hack, and to parse msi-parent in its full glory.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/drivers/irqchip/irq-gic-v3-its-platform-msi.c b/drivers/irqchip/irq-gic-v3-its-platform-msi.c
index 960a8166a6c01ab1d75f254901126e31033c7350..470b4aa7d62c2816015b57420a81f12b37ef4649 100644 (file)
--- a/drivers/irqchip/irq-gic-v3-its-platform-msi.c
+++ b/drivers/irqchip/irq-gic-v3-its-platform-msi.c
@@ -29,13 +29,25 @@ static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
 {
        struct msi_domain_info *msi_info;
        u32 dev_id;
-       int ret;
+       int ret, index = 0;
 
        msi_info = msi_get_domain_info(domain->parent);
 
        /* Suck the DeviceID out of the msi-parent property */
-       ret = of_property_read_u32_index(dev->of_node, "msi-parent",
-                                        1, &dev_id);
+       do {
+               struct of_phandle_args args;
+
+               ret = of_parse_phandle_with_args(dev->of_node,
+                                                "msi-parent", "#msi-cells",
+                                                index, &args);
+               if (args.np == irq_domain_get_of_node(domain)) {
+                       if (WARN_ON(args.args_count != 1))
+                               return -EINVAL;
+                       dev_id = args.args[0];
+                       break;
+               }
+       } while (!ret);
+
        if (ret)
                return ret;