of: base: add function to get highest id of an alias stem
I2C supports adding adapters using either a dynamic or fixed id. The
latter is provided by aliases in the DT case. To prevent id collisions
of those two types, install this function which gives us the highest
fixed id, so we can then let the dynamically created ones come after
this highest number.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/include/linux/of.h b/include/linux/of.h
index dfde07e..9bfcc18 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -332,6 +332,7 @@
extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
extern int of_alias_get_id(struct device_node *np, const char *stem);
+extern int of_alias_get_highest_id(const char *stem);
extern int of_machine_is_compatible(const char *compat);
@@ -594,6 +595,11 @@
return -ENOSYS;
}
+static inline int of_alias_get_highest_id(const char *stem)
+{
+ return -ENOSYS;
+}
+
static inline int of_machine_is_compatible(const char *compat)
{
return 0;