Messages in this thread Patch in this message | | | From | Dong Aisheng <> | Subject | [PATCH v5 1/1] dt: add of_get_child_count helper function | Date | Fri, 27 Apr 2012 11:36:20 +0800 |
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From: Dong Aisheng <dong.aisheng@linaro.org>
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> Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
--- Rob missed this patch for 3.4 kernel. Based on Rob's suggestion, we can get it go in with pinctrl driver. Since Rob once had applied it, i added Rob's ack. See: https://lkml.org/lkml/2012/4/14/239
changes v4->v5: * do not initialize child node pointer based on Stephen's suggestion.
changes v3->v4: * addressed Grant's suggestion to use for_each_child_of_node.
changes v2->v3: Addressed some people's comments: * do not use assignment as expression * return 0 for non-dt case
Changes v1->v2: * change the name from of_get_child_number to of_get_child_count --- 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 e3f942d..2ec1083 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -193,6 +193,17 @@ 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; + int num = 0; + + for_each_child_of_node(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) \ @@ -300,6 +311,11 @@ 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 0; +} + static inline int of_device_is_compatible(const struct device_node *device, const char *name) { -- 1.7.0.4
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