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[2001:14ba:a0db:1f00::ab2]) by smtp.gmail.com with ESMTPSA id v11-20020a056512096b00b004fdc5557a70sm759854lft.141.2023.07.28.04.09.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Jul 2023 04:09:43 -0700 (PDT) From: Dmitry Baryshkov To: Heikki Krogerus , Greg Kroah-Hartman , Bryan O'Donoghue , Guenter Roeck , Andy Gross , Bjorn Andersson , Konrad Dybcio Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org Subject: [PATCH v4 1/2] usb: typec: altmodes/displayport: add support for embedded DP cases Date: Fri, 28 Jul 2023 14:09:41 +0300 Message-Id: <20230728110942.485358-2-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230728110942.485358-1-dmitry.baryshkov@linaro.org> References: <20230728110942.485358-1-dmitry.baryshkov@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 --- 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/a= ltmodes/displayport.c index dc2d3a83dc26..76c3e2f8e117 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 =3D &dp_altmode_ops; =20 fwnode =3D dev_fwnode(alt->dev.parent->parent); /* typec_port fwnode */ - dp->connector_fwnode =3D fwnode_find_reference(fwnode, "displayport", 0); + if (fwnode_property_present(fwnode, "displayport")) + dp->connector_fwnode =3D fwnode_find_reference(fwnode, "displayport", 0); + else + dp->connector_fwnode =3D fwnode_handle_get(fwnode); /* embedded DP */ if (IS_ERR(dp->connector_fwnode)) dp->connector_fwnode =3D NULL; =20 --=20 2.39.2