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SubjectRe: [net-next: PATCH v4 4/7] device property: Allow iterating over available child fwnodes
On Thu, Jan 18, 2018 at 1:31 PM, Marcin Wojtas <mw@semihalf.com> wrote:
> 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>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.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);
>
> --

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