dm: core: Rename and fix uclass_get_by_name_len()

It seems that namelen is more common in U-Boot. Rename this function to
fit in better. Also fix a bug where it breaks the operation of
uclass_get_by_name() and add a test.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reported-by: Tim Harvey <tharvey@gateworks.com>

3 files changed, 9 insertions, 6 deletions

diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index 2578803..4b9b54f 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -180,14 +180,15 @@ void uclass_set_priv(struct uclass *uc, void *priv)
 	uc->priv_ = priv;
 }
 
-enum uclass_id uclass_get_by_name_len(const char *name, int len)
+enum uclass_id uclass_get_by_namelen(const char *name, int len)
 {
 	int i;
 
 	for (i = 0; i < UCLASS_COUNT; i++) {
 		struct uclass_driver *uc_drv = lists_uclass_lookup(i);
 
-		if (uc_drv && !strncmp(uc_drv->name, name, len))
+		if (uc_drv && !strncmp(uc_drv->name, name, len) &&
+		    strlen(uc_drv->name) == len)
 			return i;
 	}
 
@@ -196,7 +197,7 @@ enum uclass_id uclass_get_by_name_len(const char *name, int len)
 
 enum uclass_id uclass_get_by_name(const char *name)
 {
-	return uclass_get_by_name_len(name, strlen(name));
+	return uclass_get_by_namelen(name, strlen(name));
 }
 
 int dev_get_uclass_index(struct udevice *dev, struct uclass **ucp)
diff --git a/include/dm/uclass.h b/include/dm/uclass.h
index aafe652..f6c0110 100644
--- a/include/dm/uclass.h
+++ b/include/dm/uclass.h
@@ -173,13 +173,13 @@ int uclass_get(enum uclass_id key, struct uclass **ucp);
 const char *uclass_get_name(enum uclass_id id);
 
 /**
- * uclass_get_by_name_len() - Look up a uclass by its partial driver name
+ * uclass_get_by_namelen() - Look up a uclass by its driver name
  *
  * @name: Name to look up
- * @len: Length of the partial name
+ * @len: Length of @name (the uclass driver name must have the same length)
  * Return: the associated uclass ID, or UCLASS_INVALID if not found
  */
-enum uclass_id uclass_get_by_name_len(const char *name, int len);
+enum uclass_id uclass_get_by_namelen(const char *name, int len);
 
 /**
  * uclass_get_by_name() - Look up a uclass by its driver name
diff --git a/test/dm/core.c b/test/dm/core.c
index 0ce0b3c..2c73ecf 100644
--- a/test/dm/core.c
+++ b/test/dm/core.c
@@ -1161,6 +1161,8 @@ static int dm_test_uclass_names(struct unit_test_state *uts)
 	ut_asserteq_str("test", uclass_get_name(UCLASS_TEST));
 	ut_asserteq(UCLASS_TEST, uclass_get_by_name("test"));
 
+	ut_asserteq(UCLASS_SPI, uclass_get_by_name("spi"));
+
 	return 0;
 }
 DM_TEST(dm_test_uclass_names, UT_TESTF_SCAN_PDATA);