[PATCH v3 2/3] of: add optional options parameter to of_find_node_by_path()
Peter Hurley
peter at hurleysoftware.com
Wed Mar 4 07:45:02 PST 2015
Hi Leif,
On 11/27/2014 12:56 PM, Leif Lindholm wrote:
> Update of_find_node_by_path():
> 1) Rename function to of_find_node_opts_by_path(), adding an optional
> pointer argument. Provide a static inline wrapper version of
> of_find_node_by_path() which calls the new function with NULL as
> the optional argument.
> 2) Ignore any part of the path beyond and including the ':' separator.
> 3) Set the new provided pointer argument to the beginning of the string
> following the ':' separator.
> 4: Add tests.
>
> Signed-off-by: Leif Lindholm <leif.lindholm at linaro.org>
> ---
> drivers/of/base.c | 21 +++++++++++++++++----
> drivers/of/selftest.c | 12 ++++++++++++
> include/linux/of.h | 14 +++++++++++++-
> 3 files changed, 42 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 3823edf..7f0e5f7 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -699,10 +699,15 @@ static struct device_node *__of_find_node_by_path(struct device_node *parent,
> {
> struct device_node *child;
> int len = strchrnul(path, '/') - path;
> + int term;
>
> if (!len)
> return NULL;
>
> + term = strchrnul(path, ':') - path;
> + if (term < len)
> + len = term;
> +
> __for_each_child_of_node(parent, child) {
> const char *name = strrchr(child->full_name, '/');
> if (WARN(!name, "malformed device_node %s\n", child->full_name))
> @@ -715,11 +720,14 @@ static struct device_node *__of_find_node_by_path(struct device_node *parent,
> }
>
> /**
> - * of_find_node_by_path - Find a node matching a full OF path
> + * of_find_node_opts_by_path - Find a node matching a full OF path
> * @path: Either the full path to match, or if the path does not
> * start with '/', the name of a property of the /aliases
> * node (an alias). In the case of an alias, the node
> * matching the alias' value will be returned.
> + * @opts: Address of a pointer into which to store the start of
> + * an options string appended to the end of the path with
> + * a ':' separator.
> *
> * Valid paths:
> * /foo/bar Full path
> @@ -729,19 +737,24 @@ static struct device_node *__of_find_node_by_path(struct device_node *parent,
> * Returns a node pointer with refcount incremented, use
> * of_node_put() on it when done.
> */
> -struct device_node *of_find_node_by_path(const char *path)
> +struct device_node *of_find_node_opts_by_path(const char *path, const char **opts)
> {
> struct device_node *np = NULL;
> struct property *pp;
> unsigned long flags;
> + char *separator;
>
> if (strcmp(path, "/") == 0)
> return of_node_get(of_allnodes);
>
> + separator = strchr(path, ':');
> + if (separator && opts)
> + *opts = separator + 1;
> +
> /* The path could begin with an alias */
> if (*path != '/') {
> char *p = strchrnul(path, '/');
> - int len = p - path;
> + int len = separator ? separator - path : p - path;
>
> /* of_aliases must not be NULL */
> if (!of_aliases)
> @@ -770,7 +783,7 @@ struct device_node *of_find_node_by_path(const char *path)
> raw_spin_unlock_irqrestore(&devtree_lock, flags);
> return np;
> }
> -EXPORT_SYMBOL(of_find_node_by_path);
> +EXPORT_SYMBOL(of_find_node_opts_by_path);
>
> /**
> * of_find_node_by_name - Find a node by its "name" property
> diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
> index e2d79af..c298065 100644
> --- a/drivers/of/selftest.c
> +++ b/drivers/of/selftest.c
> @@ -43,6 +43,7 @@ static bool selftest_live_tree;
> static void __init of_selftest_find_node_by_name(void)
> {
> struct device_node *np;
> + const char *options;
>
> np = of_find_node_by_path("/testcase-data");
> selftest(np && !strcmp("/testcase-data", np->full_name),
> @@ -83,6 +84,17 @@ static void __init of_selftest_find_node_by_name(void)
> np = of_find_node_by_path("testcase-alias/missing-path");
> selftest(!np, "non-existent alias with relative path returned node %s\n", np->full_name);
> of_node_put(np);
> +
> + np = of_find_node_opts_by_path("/testcase-data:testoption", &options);
> + selftest(np && !strcmp("testoption", options),
> + "option path test failed\n");
> + of_node_put(np);
> +
> + np = of_find_node_opts_by_path("testcase-alias:testaliasoption",
> + &options);
> + selftest(np && !strcmp("testaliasoption", options),
> + "option alias path test failed\n");
> + of_node_put(np);
> }
The path parsing gets lost if the string after ':' contains '/'.
The selftests below fail with:
[ 1.365528] ### dt-test ### FAIL of_selftest_find_node_by_name():99 option path test failed
[ 1.365610] ### dt-test ### FAIL of_selftest_find_node_by_name():115 option alias path test failed
Regards,
Peter Hurley
--- >% ---
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 41a4a13..07ba5aa 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -94,6 +94,11 @@ static void __init of_selftest_find_node_by_name(void)
"option path test failed\n");
of_node_put(np);
+ np = of_find_node_opts_by_path("/testcase-data:test/option", &options);
+ selftest(np && !strcmp("test/option", options),
+ "option path test failed\n");
+ of_node_put(np);
+
np = of_find_node_opts_by_path("/testcase-data:testoption", NULL);
selftest(np, "NULL option path test failed\n");
of_node_put(np);
@@ -104,6 +109,12 @@ static void __init of_selftest_find_node_by_name(void)
"option alias path test failed\n");
of_node_put(np);
+ np = of_find_node_opts_by_path("testcase-alias:test/alias/option",
+ &options);
+ selftest(np && !strcmp("test/alias/option", options),
+ "option alias path test failed\n");
+ of_node_put(np);
+
np = of_find_node_opts_by_path("testcase-alias:testaliasoption", NULL);
selftest(np, "NULL option alias path test failed\n");
of_node_put(np);
> static void __init of_selftest_dynamic(void)
> diff --git a/include/linux/of.h b/include/linux/of.h
> index 29f0adc..a36be70 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -228,7 +228,13 @@ extern struct device_node *of_find_matching_node_and_match(
> const struct of_device_id *matches,
> const struct of_device_id **match);
>
> -extern struct device_node *of_find_node_by_path(const char *path);
> +extern struct device_node *of_find_node_opts_by_path(const char *path,
> + const char **opts);
> +static inline struct device_node *of_find_node_by_path(const char *path)
> +{
> + return of_find_node_opts_by_path(path, NULL);
> +}
> +
> extern struct device_node *of_find_node_by_phandle(phandle handle);
> extern struct device_node *of_get_parent(const struct device_node *node);
> extern struct device_node *of_get_next_parent(struct device_node *node);
> @@ -385,6 +391,12 @@ static inline struct device_node *of_find_node_by_path(const char *path)
> return NULL;
> }
>
> +static inline struct device_node *of_find_node_opts_by_path(const char *path,
> + const char **opts)
> +{
> + return NULL;
> +}
> +
> static inline struct device_node *of_get_parent(const struct device_node *node)
> {
> return NULL;
>
More information about the linux-arm-kernel
mailing list