dt: add of_get_child_count helper function
Currently most code to get child count in kernel are almost same, add a helper to implement this function for dt to use. Cc: Grant Likely <grant.likely@secretlab.ca> Acked-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -193,6 +193,17 @@ extern struct device_node *of_get_next_child(const struct device_node *node,
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for (child = of_get_next_child(parent, NULL); child != NULL; \
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child = of_get_next_child(parent, child))
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static inline int of_get_child_count(const struct device_node *np)
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{
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struct device_node *child;
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int num = 0;
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for_each_child_of_node(np, child)
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num++;
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return num;
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}
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extern struct device_node *of_find_node_with_property(
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struct device_node *from, const char *prop_name);
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#define for_each_node_with_property(dn, prop_name) \
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@ -300,6 +311,11 @@ static inline bool of_have_populated_dt(void)
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#define for_each_child_of_node(parent, child) \
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while (0)
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static inline int of_get_child_count(const struct device_node *np)
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{
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return 0;
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}
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static inline int of_device_is_compatible(const struct device_node *device,
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const char *name)
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{
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