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| author | Stephen Warren <swarren@nvidia.com> | 2012-04-04 09:27:46 -0600 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2012-04-18 13:53:11 +0200 |
| commit | c541adc637066407d4cda9db14dcb0e618966a4c (patch) | |
| tree | 0fda4e8f97c9e9a2a61524f3bb390a0a6b04ccbe /include/linux/of.h | |
| parent | c05127c4e2c6e7d9949347a76fd05c337bcd5e84 (diff) | |
| download | lwn-c541adc637066407d4cda9db14dcb0e618966a4c.tar.gz lwn-c541adc637066407d4cda9db14dcb0e618966a4c.zip | |
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.h | 35 |
1 files changed, 35 insertions, 0 deletions
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 */ /** |