This patch add function used to get the child count of a ofnode or a device
Signed-off-by: Chunfeng Yun chunfeng.yun@mediatek.com --- v4: no changes
v3: 1. add non/inline function dev_get_child_count() instead of macro suggested by Simon
v2: 1. move ofnode_get_child_count() into ofnode.c suggested by Simon 2. add a new macro dev_get_child_count() --- drivers/core/ofnode.c | 11 +++++++++++ drivers/core/read.c | 5 +++++ include/dm/ofnode.h | 8 ++++++++ include/dm/read.h | 13 +++++++++++++ 4 files changed, 37 insertions(+)
diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c index 96a5dd20bd..6f4eb422a4 100644 --- a/drivers/core/ofnode.c +++ b/drivers/core/ofnode.c @@ -453,6 +453,17 @@ ofnode ofnode_get_chosen_node(const char *name) return ofnode_path(prop); }
+int ofnode_get_child_count(ofnode parent) +{ + ofnode child; + int num = 0; + + ofnode_for_each_subnode(child, parent) + num++; + + return num; +} + static int decode_timing_property(ofnode node, const char *name, struct timing_entry *result) { diff --git a/drivers/core/read.c b/drivers/core/read.c index 1f999b1b31..046381f3a8 100644 --- a/drivers/core/read.c +++ b/drivers/core/read.c @@ -323,3 +323,8 @@ fdt_addr_t dev_read_addr_pci(const struct udevice *dev)
return addr; } + +int dev_get_child_count(const struct udevice *dev) +{ + return ofnode_get_child_count(dev_ofnode(dev)); +} diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h index b5a50e8849..0d521dbcf1 100644 --- a/include/dm/ofnode.h +++ b/include/dm/ofnode.h @@ -793,6 +793,14 @@ ofnode ofnode_by_prop_value(ofnode from, const char *propname, ofnode_valid(node); \ node = ofnode_next_subnode(node))
+/** + * ofnode_get_child_count() - get the child count of a ofnode + * + * @node: valid node to get its child count + * @return the number of subnodes + */ +int ofnode_get_child_count(ofnode parent); + /** * ofnode_translate_address() - Translate a device-tree address * diff --git a/include/dm/read.h b/include/dm/read.h index da8c7f25e7..38cf76d07a 100644 --- a/include/dm/read.h +++ b/include/dm/read.h @@ -607,6 +607,14 @@ u64 dev_translate_dma_address(const struct udevice *dev, */ int dev_read_alias_highest_id(const char *stem);
+/** + * dev_get_child_count() - get the child count of a device + * + * @dev: device to use for interation (struct udevice *) + * @return the count of child subnode + */ +int dev_get_child_count(const struct udevice *dev); + #else /* CONFIG_DM_DEV_READ_INLINE is enabled */
static inline int dev_read_u32(const struct udevice *dev, @@ -885,6 +893,11 @@ static inline int dev_read_alias_highest_id(const char *stem) return fdtdec_get_alias_highest_id(gd->fdt_blob, stem); }
+static inline int dev_get_child_count(const struct udevice *dev) +{ + return ofnode_get_child_count(dev_ofnode(dev)); +} + #endif /* CONFIG_DM_DEV_READ_INLINE */
/**