Introduce OF_is_compatible(9), a convenience function to check the "compatible"

property of an OFW/FDT node.

ok deraadt@, pactrick@

2 files changed, 22 insertions, 2 deletions

diff --git a/sys/dev/ofw/fdt.c b/sys/dev/ofw/fdt.c
index cdb588b3f5c..988cdbb8030 100644
--- a/sys/dev/ofw/fdt.c
+++ b/sys/dev/ofw/fdt.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: fdt.c,v 1.8 2016/04/06 12:10:04 patrick Exp $	*/
+/*	$OpenBSD: fdt.c,v 1.9 2016/05/16 21:12:17 kettenis Exp $	*/
 
 /*
  * Copyright (c) 2009 Dariusz Swiderski <sfires@sfires.net>
@@ -701,3 +701,22 @@ OF_getprop(int handle, char *prop, void *buf, int buflen)
 		memcpy(buf, data, min(len, buflen));
 	return len;
 }
+
+int
+OF_is_compatible(int handle, const char *name)
+{
+	void *node = (char *)tree.header + handle;
+	char *data;
+	int len;
+
+	len = fdt_node_property(node, "compatible", &data);
+	while (len > 0) {
+		if (strcmp(data, name) == 0)
+			return 1;
+		len -= strlen(data) + 1;
+		data += strlen(data) + 1;
+	}
+
+	return 0;
+}
+
diff --git a/sys/dev/ofw/openfirm.h b/sys/dev/ofw/openfirm.h
index 5affb5fcfa4..4b9c3cf0976 100644
--- a/sys/dev/ofw/openfirm.h
+++ b/sys/dev/ofw/openfirm.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: openfirm.h,v 1.10 2007/10/14 17:26:59 kettenis Exp $	*/
+/*	$OpenBSD: openfirm.h,v 1.11 2016/05/16 21:12:17 kettenis Exp $	*/
 /*	$NetBSD: openfirm.h,v 1.1 1996/09/30 16:35:10 ws Exp $	*/
 
 /*
@@ -51,6 +51,7 @@ int OF_getprop(int handle, char *prop, void *buf, int buflen);
 int OF_setprop(int, char *, const void *, int);
 int OF_nextprop(int, char *, void *);
 int OF_finddevice(char *name);
+int OF_is_compatible(int, const char *);
 int OF_instance_to_path(int ihandle, char *buf, int buflen);
 int OF_package_to_path(int phandle, char *buf, int buflen);
 int OF_call_method_1(char *method, int ihandle, int nargs, ...);