linux-kernel - [PATCH v2 1/2] usb: typec: altmodes/displayport: add support for embedded DP cases

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Message-Id: <20230709201309.274306-2-dmitry.baryshkov@linaro.org>
Date:   Sun,  9 Jul 2023 23:13:08 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: [PATCH v2 1/2] usb: typec: altmodes/displayport: add support for embedded DP cases

In the embedded cases, the DisplayPort connector is handled by the TCPM
itself. Fallback to the controller fwnode for HPD notifications to
support such usecases without requiring additional DT properties.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/usb/typec/altmodes/displayport.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
index 4e5aa17ce4c8..699438c7755e 100644
--- a/drivers/usb/typec/altmodes/displayport.c
+++ b/drivers/usb/typec/altmodes/displayport.c
@@ -578,7 +578,10 @@ 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;
 
-- 
2.39.2