dt: add property iteration helpers

This patch adds macros of_property_for_each_u32() and
of_property_for_each_string(), which iterate over an array of values
within a device-tree property. Usage is for example:

struct property *prop;
const __be32 *p;
u32 u;
of_property_for_each_u32(np, "propname", prop, p, u)
	printk("U32 value: %x\n", u);

struct property *prop;
const char *s;
of_property_for_each_string(np, "propname", prop, s)
	printk("String value: %s\n", s);

Based on work by Rob Herring <robherring2@gmail.com>

Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2 files changed, 76 insertions, 0 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 580644986945..d9bfd49b1935 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1260,3 +1260,44 @@ int of_alias_get_id(struct device_node *np, const char *stem)
         return id;
 }
 EXPORT_SYMBOL_GPL(of_alias_get_id);
+
+const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
+                               u32 *pu)
+{
+        const void *curv = cur;
+
+        if (!prop)
+                return NULL;
+
+        if (!cur) {
+                curv = prop->value;
+                goto out_val;
+        }
+
+        curv += sizeof(*cur);
+        if (curv >= prop->value + prop->length)
+                return NULL;
+
+out_val:
+        *pu = be32_to_cpup(curv);
+        return curv;
+}
+EXPORT_SYMBOL_GPL(of_prop_next_u32);
+
+const char *of_prop_next_string(struct property *prop, const char *cur)
+{
+        const void *curv = cur;
+
+        if (!prop)
+                return NULL;
+
+        if (!cur)
+                return prop->value;
+
+        curv += strlen(cur) + 1;
+        if (curv >= prop->value + prop->length)
+                return NULL;
+
+        return curv;
+}
+EXPORT_SYMBOL_GPL(of_prop_next_string);
diff --git a/include/linux/of.h b/include/linux/of.h
index fa7fb1d97458..e3f942d9da89 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -259,6 +259,37 @@ extern void of_detach_node(struct device_node *);
 #endif
 
 #define of_match_ptr(_ptr)      (_ptr)
+
+/*
+ * struct property *prop;
+ * const __be32 *p;
+ * u32 u;
+ *
+ * of_property_for_each_u32(np, "propname", prop, p, u)
+ *         printk("U32 value: %x\n", u);
+ */
+const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
+                               u32 *pu);
+#define of_property_for_each_u32(np, propname, prop, p, u)      \
+        for (prop = of_find_property(np, propname, NULL),       \
+                p = of_prop_next_u32(prop, NULL, &u);           \
+                p;                                              \
+                p = of_prop_next_u32(prop, p, &u))
+
+/*
+ * struct property *prop;
+ * const char *s;
+ *
+ * of_property_for_each_string(np, "propname", prop, s)
+ *         printk("String value: %s\n", s);
+ */
+const char *of_prop_next_string(struct property *prop, const char *cur);
+#define of_property_for_each_string(np, propname, prop, s)      \
+        for (prop = of_find_property(np, propname, NULL),       \
+                s = of_prop_next_string(prop, NULL);            \
+                s;                                              \
+                s = of_prop_next_string(prop, s))
+
 #else /* CONFIG_OF */
 
 static inline bool of_have_populated_dt(void)
@@ -349,6 +380,10 @@ static inline int of_machine_is_compatible(const char *compat)
 
 #define of_match_ptr(_ptr)      NULL
 #define of_match_node(_matches, _node)  NULL
+#define of_property_for_each_u32(np, propname, prop, p, u) \
+        while (0)
+#define of_property_for_each_string(np, propname, prop, s) \
+        while (0)
 #endif /* CONFIG_OF */
 
 /**