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    Subject[RFC PATCH v2 1/4] dt: add of_get_child_number helper function
    Date
    From: Dong Aisheng <dong.aisheng@linaro.org>

    Currently most code to get child number in kernel are almost same,
    add a helper to implement this function for dt to use.

    Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
    Cc: Grant Likely <grant.likely@secretlab.ca>
    Cc: Rob Herring <rob.herring@calxeda.com>
    ---
    include/linux/of.h | 17 +++++++++++++++++
    1 files changed, 17 insertions(+), 0 deletions(-)

    diff --git a/include/linux/of.h b/include/linux/of.h
    index 4948552..09d53dc 100644
    --- a/include/linux/of.h
    +++ b/include/linux/of.h
    @@ -189,6 +189,18 @@ 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_number(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 +274,11 @@ static inline bool of_have_populated_dt(void)
    #define for_each_child_of_node(parent, child) \
    while (0)

    +static inline int of_get_child_number(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



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