[PATCH 2/2] of: dynamic: add overlay-allowed DT property

Alan Tull
2017-12-04T19:14:13Z

Allow DT nodes to be marked as valid targets for DT
overlays by the added "overlay-allowed" property.

Signed-off-by: Alan Tull <atull@kernel.org>
---
drivers/of/base.c | 4 ++--
drivers/of/dynamic.c | 3 +++
drivers/of/fdt.c | 3 +++
drivers/of/of_private.h | 2 ++
4 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 26618ba..ac6b326 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -116,8 +116,8 @@ void __init of_core_init(void)
proc_symlink("device-tree", NULL, "/sys/firmware/devicetree/base");
}

-static struct property *__of_find_property(const struct device_node *np,
- const char *name, int *lenp)
+struct property *__of_find_property(const struct device_node *np,
+ const char *name, int *lenp)
{
struct property *pp;

diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index ab988d8..fae9b85 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -207,6 +207,9 @@ static void __of_attach_node(struct device_node *np)
np->name = __of_get_property(np, "name", NULL) ? : "<NULL>";
np->type = __of_get_property(np, "device_type", NULL) ? : "<NULL>";

+ if (__of_find_property(np, "overlay-allowed", NULL))
+ of_node_set_flag(np, OF_OVERLAY_ENABLED);
+
phandle = __of_get_property(np, "phandle", &sz);
if (!phandle)
phandle = __of_get_property(np, "linux,phandle", &sz);
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 4675e5a..9237f30 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -323,6 +323,9 @@ static bool populate_node(const void *blob,
np->name = "<NULL>";
if (!np->type)
np->type = "<NULL>";
+
+ if (of_find_property(np, "overlay-allowed", NULL))
+ of_node_set_flag(np, OF_OVERLAY_ENABLED);
}

*pnp = np;
diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h
index 92a9a36..75fcba3 100644
--- a/drivers/of/of_private.h
+++ b/drivers/of/of_private.h
@@ -115,6 +115,8 @@ struct device_node *__of_find_node_by_path(struct device_node *parent,
struct device_node *__of_find_node_by_full_path(struct device_node *node,
const char *path);

+extern struct property *__of_find_property(const struct device_node *np,
+ const char *name, int *lenp);
extern const void *__of_get_property(const struct device_node *np,
const char *name, int *lenp);
extern int __of_add_property(struct device_node *np, struct property *prop);
--
2.7.4