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    Subject[net-next: PATCH v4 4/7] device property: Allow iterating over available child fwnodes
    Date
    Implement a new helper function fwnode_get_next_available_child_node(),
    which enables obtaining next enabled child fwnode, which
    works on a similar basis to OF's of_get_next_available_child().

    This commit also introduces a macro, thanks to which it is
    possible to iterate over the available fwnodes, using the
    new function described above.

    Signed-off-by: Marcin Wojtas <mw@semihalf.com>
    ---
    drivers/base/property.c | 26 ++++++++++++++++++++
    include/linux/property.h | 6 +++++
    2 files changed, 32 insertions(+)

    diff --git a/drivers/base/property.c b/drivers/base/property.c
    index 1d6c9d9..613ba82 100644
    --- a/drivers/base/property.c
    +++ b/drivers/base/property.c
    @@ -998,6 +998,32 @@ fwnode_get_next_child_node(const struct fwnode_handle *fwnode,
    EXPORT_SYMBOL_GPL(fwnode_get_next_child_node);

    /**
    + * fwnode_get_next_available_child_node - Return the next
    + * available child node handle for a node
    + * @fwnode: Firmware node to find the next child node for.
    + * @child: Handle to one of the node's child nodes or a %NULL handle.
    + */
    +struct fwnode_handle *
    +fwnode_get_next_available_child_node(const struct fwnode_handle *fwnode,
    + struct fwnode_handle *child)
    +{
    + struct fwnode_handle *next_child = child;
    +
    + if (!fwnode)
    + return NULL;
    +
    + do {
    + next_child = fwnode_get_next_child_node(fwnode, next_child);
    +
    + if (!next_child || fwnode_device_is_available(next_child))
    + break;
    + } while (next_child);
    +
    + return next_child;
    +}
    +EXPORT_SYMBOL_GPL(fwnode_get_next_available_child_node);
    +
    +/**
    * device_get_next_child_node - Return the next child node handle for a device
    * @dev: Device to find the next child node for.
    * @child: Handle to one of the device's child nodes or a null handle.
    diff --git a/include/linux/property.h b/include/linux/property.h
    index e05889f..5b0563a 100644
    --- a/include/linux/property.h
    +++ b/include/linux/property.h
    @@ -83,11 +83,17 @@ struct fwnode_handle *fwnode_get_next_parent(
    struct fwnode_handle *fwnode);
    struct fwnode_handle *fwnode_get_next_child_node(
    const struct fwnode_handle *fwnode, struct fwnode_handle *child);
    +struct fwnode_handle *fwnode_get_next_available_child_node(
    + const struct fwnode_handle *fwnode, struct fwnode_handle *child);

    #define fwnode_for_each_child_node(fwnode, child) \
    for (child = fwnode_get_next_child_node(fwnode, NULL); child; \
    child = fwnode_get_next_child_node(fwnode, child))

    +#define fwnode_for_each_available_child_node(fwnode, child) \
    + for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\
    + child = fwnode_get_next_available_child_node(fwnode, child))
    +
    struct fwnode_handle *device_get_next_child_node(
    struct device *dev, struct fwnode_handle *child);

    --
    2.7.4
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