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usb: typec: altmodes/displayport: add support for embedded DP cases 

In the embedded cases, the DisplayPort connector is handled by the TCPM
itself. It was proposed to add the "displayport" OF property to the DT
bindings, but it  was rejected in favour of properly describing the
electrical signal path using of_graph.

Fallback to the controller fwnode for HPD notifications to
support such usecases without requiring additional DT properties.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20230817150824.14371-2-dmitry.baryshkov@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Baryshkov 2023-08-17 18:08:23 +03:00 committed by Greg Kroah-Hartman
parent ae25761157
commit 0bd9e0219b
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/typec/altmodes/displayport.c
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@ -594,7 +594,10 @@ int dp_altmode_probe(struct typec_altmode *alt)
alt->ops = &dp_altmode_ops;
fwnode = dev_fwnode(alt->dev.parent->parent); /* typec_port fwnode */
dp->connector_fwnode = fwnode_find_reference(fwnode, "displayport", 0);
if (fwnode_property_present(fwnode, "displayport"))
dp->connector_fwnode = fwnode_find_reference(fwnode, "displayport", 0);
else
dp->connector_fwnode = fwnode_handle_get(fwnode); /* embedded DP */
if (IS_ERR(dp->connector_fwnode))
dp->connector_fwnode = NULL;