From: Dong Aisheng <[email protected]> Currently most code to get child count in kernel are almost same, add a helper to implement this function for dt to use.
--- Changes v1->v2: * change the name from of_get_child_number to of_get_child_count Signed-off-by: Dong Aisheng <[email protected]> Cc: Grant Likely <[email protected]> Cc: Rob Herring <[email protected]> --- include/linux/of.h | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-) diff --git a/include/linux/of.h b/include/linux/of.h index 4948552..d0d91a1 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -189,6 +189,17 @@ extern struct device_node *of_get_next_child(const struct device_node *node, for (child = of_get_next_child(parent, NULL); child != NULL; \ child = of_get_next_child(parent, child)) +static inline int of_get_child_count(const struct device_node *np) +{ + struct device_node *child = NULL; + int num = 0; + + while ((child = of_get_next_child(np, child))) + num++; + + return num; +} + extern struct device_node *of_find_node_with_property( struct device_node *from, const char *prop_name); #define for_each_node_with_property(dn, prop_name) \ @@ -262,6 +273,11 @@ static inline bool of_have_populated_dt(void) #define for_each_child_of_node(parent, child) \ while (0) +static inline int of_get_child_count(const struct device_node *np) +{ + return -ENOSYS; +} + static inline int of_device_is_compatible(const struct device_node *device, const char *name) { -- 1.7.0.4 _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
