[PATCH 08/22] OF: base: rename of_node_disabled to of_device_is_available

[Sebastian Hesselbarth]

According to ePAPR 1.1 spec, device tree nodes status can be either
"okay", "disabled", "fail", or "fail-sss". Barebox already has a function
to check for "disabled" nodes, while Linux checks for "okay" or "ok".
To synchronize Barebox and Linux OF APIs, rename of_node_disabled to
of_device_is_available and check for "okay" instead of "disabled" as it
also makes "fail"ed devices unavailable.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
---
Cc: barebox at lists.infradead.org
---
 drivers/of/base.c |   26 ++++++++++++++++++++------
 include/of.h      |    6 ++++++
 2 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 34793b3..827a1db 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -717,17 +717,31 @@ int of_set_root_node(struct device_node *node)
 	return 0;
 }
 
-static int of_node_disabled(struct device_node *node)
+/**
+ *  of_device_is_available - check if a device is available for use
+ *
+ *  @device: Node to check for availability
+ *
+ *  Returns 1 if the status property is absent or set to "okay" or "ok",
+ *  0 otherwise
+ */
+int of_device_is_available(const struct device_node *device)
 {
-	struct property *p;
+	const char *status;
+	int statlen;
+
+	status = of_get_property(device, "status", &statlen);
+	if (status == NULL)
+		return 1;
 
-	p = of_find_property(node, "status", NULL);
-	if (p) {
-		if (!strcmp("disabled", p->value))
+	if (statlen > 0) {
+		if (!strcmp(status, "okay") || !strcmp(status, "ok"))
 			return 1;
 	}
+
 	return 0;
 }
+EXPORT_SYMBOL(of_device_is_available);
 
 void of_print_nodes(struct device_node *node, int indent)
 {
@@ -921,7 +935,7 @@ static struct device_d *add_of_device(struct device_node *node,
 {
 	const struct property *cp;
 
-	if (of_node_disabled(node))
+	if (!of_device_is_available(node))
 		return NULL;
 
 	cp = of_get_property(node, "compatible", NULL);
diff --git a/include/of.h b/include/of.h
index 871f5e9..340fb83 100644
--- a/include/of.h
+++ b/include/of.h
@@ -183,6 +183,7 @@ extern struct property *of_find_property(const struct device_node *np,
 					const char *name, int *lenp);
 
 extern struct device_node *of_find_node_by_path(const char *path);
+extern int of_device_is_available(const struct device_node *device);
 
 extern void of_alias_scan(void);
 extern int of_alias_get_id(struct device_node *np, const char *stem);
@@ -240,6 +241,11 @@ static inline struct device_node *of_find_node_by_path(const char *path)
 	return NULL;
 }
 
+static inline int of_device_is_available(const struct device_node *device)
+{
+	return 0;
+}
+
 static inline void of_alias_scan(void)
 {
 }
-- 
1.7.2.5