board code fix up the device tree for OS consumption. Sometimes it's
useful for the fixup to append onto an existing property.
Add a helper that simplifies this.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
drivers/of/base.c | 36 ++++++++++++++++++++++++++++++++++++
include/of.h | 8 ++++++++
2 files changed, 44 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 101b2f74c74f..0893bdf3e04f 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2321,6 +2321,42 @@ int of_set_property(struct device_node *np, const char *name, const void *val, i
return 0;
}
+int of_append_property(struct device_node *np, const char *name, const void *val, int len)
+{
+ struct property *pp;
+ void *buf = NULL;
+ int orig_len = 0;
+
+ if (!np)
+ return -ENOENT;
+
+ pp = of_find_property(np, name, NULL);
+ if (pp) {
+ buf = pp->value;
+ orig_len = pp->length;
+ }
+
+ buf = realloc(buf, orig_len + len);
+ if (!buf)
+ return -ENOMEM;
+
+ memcpy(buf + orig_len, val, len);
+
+ if (pp) {
+ pp->value = buf;
+ pp->length += len;
+
+ if (pp->value_const) {
+ memcpy(buf, pp->value_const, orig_len);
+ pp->value_const = NULL;
+ }
+ } else {
+ pp = __of_new_property(np, name, buf, len);
+ }
+
+ return 0;
+}
+
int of_property_sprintf(struct device_node *np,
const char *propname, const char *fmt, ...)
{
diff --git a/include/of.h b/include/of.h
index c65cef5a5a7c..97b4b3dd79bd 100644
--- a/include/of.h
+++ b/include/of.h
@@ -131,6 +131,8 @@ extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
extern int of_set_property(struct device_node *node, const char *p,
const void *val, int len, int create);
+extern int of_append_property(struct device_node *np, const char *p,
+ const void *val, int len);
extern struct property *of_new_property(struct device_node *node,
const char *name, const void *data, int len);
extern struct property *of_new_property_const(struct device_node *node,
@@ -515,6 +517,12 @@ static inline int of_set_property(struct device_node *node, const char *p,
return -ENOSYS;
}
+static inline int of_append_property(struct device_node *np, const char *p,
+ const void *val, int len)
+{
+ return -ENOSYS;
+}
+
static inline struct property *of_new_property(struct device_node *node,
const char *name, const void *data, int len)
{
--
2.30.2
