This allows fw_devlink to create device links between consumers of
a MSI and the supplier of the MSI.
Signed-off-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
---
drivers/of/property.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/of/property.c b/drivers/of/property.c
index ddc75cd50825..e4096b79a872 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -1325,6 +1325,37 @@ static struct device_node *parse_interrupts(struct device_node *np,
return of_irq_parse_one(np, index, &sup_args) ? NULL : sup_args.np;
}
+static struct device_node *parse_msi_parent(struct device_node *np,
+ const char *prop_name, int index)
+{
+ struct of_phandle_args sup_args;
+ struct device_node *msi_np;
+
+ if (!IS_ENABLED(CONFIG_OF_IRQ))
+ return NULL;
+
+ if (strcmp(prop_name, "msi-parent"))
+ return NULL;
+
+ msi_np = of_parse_phandle(np, prop_name, 0);
+ if (msi_np) {
+ if (!of_property_read_bool(msi_np, "#msi-cells")) {
+ if (index) {
+ of_node_put(msi_np);
+ return NULL;
+ }
+ return msi_np;
+ }
+ of_node_put(msi_np);
+ }
+
+ if (of_parse_phandle_with_args(np, prop_name, "#msi-cells", index,
+ &sup_args))
+ return NULL;
+
+ return sup_args.np;
+}
+
static const struct supplier_bindings of_supplier_bindings[] = {
{ .parse_prop = parse_clocks, },
{ .parse_prop = parse_interconnects, },
@@ -1359,6 +1390,7 @@ static const struct supplier_bindings of_supplier_bindings[] = {
{ .parse_prop = parse_regulators, },
{ .parse_prop = parse_gpio, },
{ .parse_prop = parse_gpios, },
+ { .parse_prop = parse_msi_parent, },
{}
};
--
2.34.1
