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dt: add helper function to read u8 & u16 variables & arrays

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This adds following helper routines:
- of_property_read_u8_array()
- of_property_read_u16_array()
- of_property_read_u8()
- of_property_read_u16()

This expects arrays from DT to be passed as:
- u8 array:
	property = /bits/ 8 <0x50 0x60 0x70>;
- u16 array:
	property = /bits/ 16 <0x5000 0x6000 0x7000>;

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
This commit is contained in:
Viresh Kumar 2012-11-20 10:15:19 +05:30 • committed by Rob Herring
parent 9846210b1e
commit be193249b4
2 changed files with 107 additions and 0 deletions
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30
include/linux/of.h
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@ -223,6 +223,10 @@ extern struct device_node *of_find_node_with_property(
extern struct property *of_find_property(const struct device_node *np,
const char *name,
int *lenp);
extern int of_property_read_u8_array(const struct device_node *np,
const char *propname, u8 *out_values, size_t sz);
extern int of_property_read_u16_array(const struct device_node *np,
const char *propname, u16 *out_values, size_t sz);
extern int of_property_read_u32_array(const struct device_node *np,
const char *propname,
u32 *out_values,
@ -364,6 +368,18 @@ static inline struct device_node *of_find_compatible_node(
return NULL;
}
static inline int of_property_read_u8_array(const struct device_node *np,
const char *propname, u8 *out_values, size_t sz)
{
return -ENOSYS;
}
static inline int of_property_read_u16_array(const struct device_node *np,
const char *propname, u16 *out_values, size_t sz)
{
return -ENOSYS;
}
static inline int of_property_read_u32_array(const struct device_node *np,
const char *propname,
u32 *out_values, size_t sz)
@ -470,6 +486,20 @@ static inline bool of_property_read_bool(const struct device_node *np,
return prop ? true : false;
}
static inline int of_property_read_u8(const struct device_node *np,
const char *propname,
u8 *out_value)
{
return of_property_read_u8_array(np, propname, out_value, 1);
}
static inline int of_property_read_u16(const struct device_node *np,
const char *propname,
u16 *out_value)
{
return of_property_read_u16_array(np, propname, out_value, 1);
}
static inline int of_property_read_u32(const struct device_node *np,
const char *propname,
u32 *out_value)