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device property: Check fwnode->secondary in fwnode_graph_get_next_endpoint()

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Sensor drivers often check for an endpoint to make sure that they're
connected to a consuming device like a CIO2 during .probe(). Some of
those endpoints might be in the form of software_nodes assigned as
a secondary to the device's fwnode_handle. Account for this possibility
in fwnode_graph_get_next_endpoint() to avoid having to do it in the
sensor drivers themselves.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Daniel Scally 2021-08-06 23:09:05 +01:00 committed by Rafael J. Wysocki
parent 7c60610d47
commit b5b41ab6b0
1 changed files with 20 additions and 1 deletions
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21
drivers/base/property.c
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@ -1033,7 +1033,26 @@ struct fwnode_handle *
fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
struct fwnode_handle *prev)
{
return fwnode_call_ptr_op(fwnode, graph_get_next_endpoint, prev);
const struct fwnode_handle *parent;
struct fwnode_handle *ep;
/*
* If this function is in a loop and the previous iteration returned
* an endpoint from fwnode->secondary, then we need to use the secondary
* as parent rather than @fwnode.
*/
if (prev)
parent = fwnode_graph_get_port_parent(prev);
else
parent = fwnode;
ep = fwnode_call_ptr_op(parent, graph_get_next_endpoint, prev);
if (IS_ERR_OR_NULL(ep) &&
!IS_ERR_OR_NULL(parent) && !IS_ERR_OR_NULL(parent->secondary))
ep = fwnode_graph_get_next_endpoint(parent->secondary, NULL);
return ep;
}
EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);