Add OF_xref_from_device() so that there's no need to have an intermediate

call to ofw_bus_get_node() to lookup info that's already in the xreflist.

2 files changed, 17 insertions, 0 deletions

diff --git a/sys/dev/ofw/openfirm.c b/sys/dev/ofw/openfirm.c
index ae66cae..0df49c5 100644
--- a/sys/dev/ofw/openfirm.c
+++ b/sys/dev/ofw/openfirm.c
@@ -96,6 +96,7 @@ static boolean_t xref_init_done;
 
 #define	FIND_BY_XREF	0
 #define	FIND_BY_NODE	1
+#define	FIND_BY_DEV	1
 
 /*
  * xref-phandle-device lookup helper routines.
@@ -152,6 +153,8 @@ xrefinfo_find(phandle_t phandle, int find_by)
 			return (xi);
 		else if (find_by == FIND_BY_NODE && phandle == xi->node)
 			return (xi);
+		else if (find_by == FIND_BY_DEV && phandle == (uintptr_t)xi->dev)
+			return (xi);
 	}
 	return (NULL);
 }
@@ -584,6 +587,19 @@ OF_device_from_xref(phandle_t xref)
 	panic("Attempt to find device before xreflist_init");
 }
 
+phandle_t
+OF_xref_from_device(device_t dev)
+{
+	struct xrefinfo *xi;
+
+	if (xref_init_done) {
+		if ((xi = xrefinfo_find((uintptr_t)dev, FIND_BY_DEV)) == NULL)
+			return (0);
+		return (xi->xref);
+	}
+	panic("Attempt to find xref before xreflist_init");
+}
+
 int
 OF_device_register_xref(phandle_t xref, device_t dev)
 {
diff --git a/sys/dev/ofw/openfirm.h b/sys/dev/ofw/openfirm.h
index 37b27f5..d3967a4 100644
--- a/sys/dev/ofw/openfirm.h
+++ b/sys/dev/ofw/openfirm.h
@@ -141,6 +141,7 @@ phandle_t	OF_xref_from_node(phandle_t node);
  * the device_t associated with an xref handle.
  */
 device_t	OF_device_from_xref(phandle_t xref);
+phandle_t	OF_xref_from_device(device_t dev);
 int		OF_device_register_xref(phandle_t xref, device_t dev);
 
 /* Device I/O functions */