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

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>

1 files changed, 30 insertions, 0 deletions

diff --git a/include/linux/of.h b/include/linux/of.h
index 857dde984a6e..ab1af0e14659 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -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)