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authorStephen Warren <swarren@nvidia.com>2012-04-04 09:27:46 -0600
committerLinus Walleij <linus.walleij@linaro.org>2012-04-18 13:53:11 +0200
commitc541adc637066407d4cda9db14dcb0e618966a4c (patch)
tree0fda4e8f97c9e9a2a61524f3bb390a0a6b04ccbe /include/linux/of.h
parentc05127c4e2c6e7d9949347a76fd05c337bcd5e84 (diff)
downloadop-kernel-dev-c541adc637066407d4cda9db14dcb0e618966a4c.zip
op-kernel-dev-c541adc637066407d4cda9db14dcb0e618966a4c.tar.gz
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>
Diffstat (limited to 'include/linux/of.h')
-rw-r--r--include/linux/of.h35
1 files changed, 35 insertions, 0 deletions
diff --git a/include/linux/of.h b/include/linux/of.h
index fa7fb1d..e3f942d 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 */
/**
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