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>
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@ -594,7 +594,10 @@ int dp_altmode_probe(struct typec_altmode *alt)
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alt->ops = &dp_altmode_ops;
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fwnode = dev_fwnode(alt->dev.parent->parent); /* typec_port fwnode */
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if (fwnode_property_present(fwnode, "displayport"))
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dp->connector_fwnode = fwnode_find_reference(fwnode, "displayport", 0);
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else
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dp->connector_fwnode = fwnode_handle_get(fwnode); /* embedded DP */
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if (IS_ERR(dp->connector_fwnode))
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dp->connector_fwnode = NULL;
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