of: base: Introduce of_alias_get_alias_list() to check alias IDs

The function travels the lookup table to record alias ids for the given
device match structures and alias stem.
This function will be used by serial drivers to check if requested alias
is allocated or free to use.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 74eaedd5b860f1c1fd42faa187d5cda802d0ae8e..33011b88ed3f0192d827753ef13c8559beeadb9e 100644 (file)
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -16,6 +16,7 @@
 
 #define pr_fmt(fmt)    "OF: " fmt
 
+#include <linux/bitmap.h>
 #include <linux/console.h>
 #include <linux/ctype.h>
 #include <linux/cpu.h>
@@ -1942,6 +1943,57 @@ int of_alias_get_id(struct device_node *np, const char *stem)
 }
 EXPORT_SYMBOL_GPL(of_alias_get_id);
 
+/**
+ * of_alias_get_alias_list - Get alias list for the given device driver
+ * @matches:   Array of OF device match structures to search in
+ * @stem:      Alias stem of the given device_node
+ * @bitmap:    Bitmap field pointer
+ * @nbits:     Maximum number of alias ID which can be recorded it bitmap
+ *
+ * The function travels the lookup table to record alias ids for the given
+ * device match structures and alias stem.
+ *
+ * Return:     0 or -ENOSYS when !CONFIG_OF
+ */
+int of_alias_get_alias_list(const struct of_device_id *matches,
+                            const char *stem, unsigned long *bitmap,
+                            unsigned int nbits)
+{
+       struct alias_prop *app;
+
+       /* Zero bitmap field to make sure that all the time it is clean */
+       bitmap_zero(bitmap, nbits);
+
+       mutex_lock(&of_mutex);
+       pr_debug("%s: Looking for stem: %s\n", __func__, stem);
+       list_for_each_entry(app, &aliases_lookup, link) {
+               pr_debug("%s: stem: %s, id: %d\n",
+                        __func__, app->stem, app->id);
+
+               if (strcmp(app->stem, stem) != 0) {
+                       pr_debug("%s: stem comparison doesn't passed %s\n",
+                                __func__, app->stem);
+                       continue;
+               }
+
+               if (app->id >= nbits) {
+                       pr_debug("%s: ID %d greater then bitmap field %d\n",
+                               __func__, app->id, nbits);
+                       continue;
+               }
+
+               if (of_match_node(matches, app->np)) {
+                       pr_debug("%s: Allocated ID %d\n", __func__, app->id);
+                       set_bit(app->id, bitmap);
+               }
+               /* Alias exist but it not compatible with matches */
+       }
+       mutex_unlock(&of_mutex);
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(of_alias_get_alias_list);
+
 /**
  * of_alias_get_highest_id - Get highest alias id for the given stem
  * @stem:      Alias stem to be examined

diff --git a/include/linux/of.h b/include/linux/of.h
index 99b0ebf496329f347cf723ad5da07ad5c23bcf9d..d51457b40725e353e98b1a1618c9cc3edd5e7d75 100644 (file)
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -392,6 +392,9 @@ extern int of_phandle_iterator_args(struct of_phandle_iterator *it,
 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_alias_get_alias_list(const struct of_device_id *matches,
+                                  const char *stem, unsigned long *bitmap,
+                                  unsigned int nbits);
 
 extern int of_machine_is_compatible(const char *compat);
 
@@ -893,6 +896,13 @@ static inline int of_alias_get_highest_id(const char *stem)
        return -ENOSYS;
 }
 
+static inline int of_alias_get_alias_list(const struct of_device_id *matches,
+                                         const char *stem, unsigned long *bitmap,
+                                         unsigned int nbits)
+{
+       return -ENOSYS;
+}
+
 static inline int of_machine_is_compatible(const char *compat)
 {
        return 0;