On Tuesday, February 07, 2017 11:57:55 AM Al Stone wrote:
> On 02/02/2017 09:22 AM, Sakari Ailus wrote:
> > In order to differentiate the functionality between dropping a reference
> > to the node (or not) for the benefit of OF, introduce
> > fwnode_get_next_parent().
> >
> > Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> > ---
> > drivers/base/property.c | 29 +++++++++++++++++++++++++++++
> > include/linux/property.h | 1 +
> > 2 files changed, 30 insertions(+)
> >
> > diff --git a/drivers/base/property.c b/drivers/base/property.c
> > index 28125a5..8e4398f 100644
> > --- a/drivers/base/property.c
> > +++ b/drivers/base/property.c
> > @@ -868,6 +868,35 @@ int device_add_properties(struct device *dev, struct property_entry *properties)
> > EXPORT_SYMBOL_GPL(device_add_properties);
> >
> > /**
> > + * fwnode_get_next_parent - Iterate to the node's parent
> > + * @fwnode: Firmware whose parent is retrieved
> > + *
> > + * This is like fwnode_get_parent() except that it drops the refcount
> > + * on the passed node, making it suitable for iterating through a
> > + * node's parents.
> > + *
> > + * Returns a node pointer with refcount incremented, use
> > + * fwnode_handle_node() on it when done.
> > + */
> > +struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode)
> > +{
> > + struct fwnode_handle *parent = NULL;
> > +
> > + if (is_of_node(fwnode)) {
> > + struct device_node *node;
> > +
> > + node = of_get_next_parent(to_of_node(fwnode));
> > + if (node)
> > + parent = &node->fwnode;
> > + } else if (is_acpi_node(fwnode)) {
> > + parent = acpi_node_get_parent(fwnode);
> > + }
> > +
> > + return parent;
> > +}
> > +EXPORT_SYMBOL_GPL(fwnode_get_next_parent);
>
> I think I agree with Rob's prior comments about making an ops struct for DT
> vs ACPI. Out of the 16 patches, 2/16, 3/16, 5/16 (multiple times), and this
> patch all end up using the same construct. Maybe it needs to be a separate
> refactoring effort, but if it's happening this often just in this patch set,
> it seems like it's getting time to clean things up.
As long as there are two cases only (ACPI vs DT), an ops struct wouldn't
really make things simpler and it would make the code more difficult to
follow.
But we do have a third case (static or built-in properties) and it doesn't
seem to be covered at all.
Thanks,
Rafael
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