devicetree: Add dt_node_is_enabled()

This accessor tests the "status" property allowing us to represent
disabled devices in the device-tree. It will be used by PHB4 initially
but its usage could be made more widespread.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/core/device.c b/core/device.c
index 4818d40..9e7ef0d 100644
--- a/core/device.c
+++ b/core/device.c
@@ -910,3 +910,13 @@ u64 dt_translate_address(const struct dt_node *node, unsigned int index,
 	/* XXX TODO */
 	return dt_get_address(node, index, out_size);
 }
+
+bool dt_node_is_enabled(struct dt_node *node)
+{
+	const struct dt_property *p = dt_find_property(node, "status");
+
+	if (!p)
+		return true;
+
+	return p->len > 1 && p->prop[0] == 'o' && p->prop[1] == 'k';
+}