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authorMichal Simek <michal.simek@xilinx.com>2019-01-31 16:30:57 +0100
committerHeiko Schocher <hs@denx.de>2019-02-08 06:24:57 +0100
commit5ebc7c7e27780ce9a16289eeb87290eebd248ea9 (patch)
tree2ac627256a47dcee9cb4ee592fb5d98269ebd51a
parent97276a91db8e98f081a40ddf9dc8f81d4032a756 (diff)
dm: core: Add of_alias_get_highest_id()
The same functionality was added to Linux for i2c bus registration with this commit message: " 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> " Add it also to U-Boot for DM I2C support. Signed-off-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Heiko Schocher <hs@denx.de> Reviewed-by: Simon Glass <sjg@chromium.org>
-rw-r--r--drivers/core/of_access.c18
-rw-r--r--include/dm/of_access.h10
2 files changed, 28 insertions, 0 deletions
diff --git a/drivers/core/of_access.c b/drivers/core/of_access.c
index 14c020a687..945b81448c 100644
--- a/drivers/core/of_access.c
+++ b/drivers/core/of_access.c
@@ -812,6 +812,24 @@ int of_alias_get_id(const struct device_node *np, const char *stem)
return id;
}
+int of_alias_get_highest_id(const char *stem)
+{
+ struct alias_prop *app;
+ int id = -1;
+
+ mutex_lock(&of_mutex);
+ list_for_each_entry(app, &aliases_lookup, link) {
+ if (strcmp(app->stem, stem) != 0)
+ continue;
+
+ if (app->id > id)
+ id = app->id;
+ }
+ mutex_unlock(&of_mutex);
+
+ return id;
+}
+
struct device_node *of_get_stdout(void)
{
return of_stdout;
diff --git a/include/dm/of_access.h b/include/dm/of_access.h
index 5ed1a0cdb4..13fedb7cf5 100644
--- a/include/dm/of_access.h
+++ b/include/dm/of_access.h
@@ -425,6 +425,16 @@ int of_alias_scan(void);
int of_alias_get_id(const struct device_node *np, const char *stem);
/**
+ * of_alias_get_highest_id - Get highest alias id for the given stem
+ * @stem: Alias stem to be examined
+ *
+ * The function travels the lookup table to get the highest alias id for the
+ * given alias stem.
+ * @return alias ID, if found, else -1
+ */
+int of_alias_get_highest_id(const char *stem);
+
+/**
* of_get_stdout() - Get node to use for stdout
*
* @return node referred to by stdout-path alias, or NULL if none