linux-kernel - Re: [PATCH v8 10/10] arm64: dts: rockchip: rk3399-evb-ind: Add support for DisplayPort

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAL411-o6mF71oBeRsJ-OPZNbLegn4iJ_ELN9xVdppTM3ssUPOw@mail.gmail.com>
Date: Wed, 29 Oct 2025 17:45:45 +0800
From: Peter Chen <hzpeterchen@...il.com>
To: Chaoyi Chen <kernel@...kyi.com>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Heiko Stuebner <heiko@...ech.de>, Sandy Huang <hjc@...k-chips.com>, 
	Andy Yan <andy.yan@...k-chips.com>, Yubing Zhang <yubing.zhang@...k-chips.com>, 
	Frank Wang <frank.wang@...k-chips.com>, Andrzej Hajda <andrzej.hajda@...el.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Jonas Karlman <jonas@...boo.se>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Amit Sunil Dhamne <amitsd@...gle.com>, Chaoyi Chen <chaoyi.chen@...k-chips.com>, 
	Dragan Simic <dsimic@...jaro.org>, Johan Jonker <jbx6244@...il.com>, 
	Diederik de Haas <didi.debian@...ow.org>, Peter Robinson <pbrobinson@...il.com>, linux-usb@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-phy@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
	linux-rockchip@...ts.infradead.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v8 10/10] arm64: dts: rockchip: rk3399-evb-ind: Add
 support for DisplayPort

> +&i2c4 {
> +       i2c-scl-rising-time-ns = <475>;
> +       i2c-scl-falling-time-ns = <26>;
> +       status = "okay";
> +
> +       usbc0: typec-portc@22 {
> +               compatible = "fcs,fusb302";
> +               reg = <0x22>;
> +               interrupt-parent = <&gpio1>;
> +               interrupts = <RK_PA2 IRQ_TYPE_LEVEL_LOW>;
> +               pinctrl-names = "default";
> +               pinctrl-0 = <&usbc0_int>;
> +               vbus-supply = <&vbus_typec>;
> +
> +               usb_con: connector {
> +                       compatible = "usb-c-connector";
> +                       label = "USB-C";
> +                       data-role = "dual";
> +                       power-role = "dual";
> +                       try-power-role = "sink";
> +                       op-sink-microwatt = <1000000>;
> +                       sink-pdos =
> +                               <PDO_FIXED(5000, 2500, PDO_FIXED_USB_COMM)>;
> +                       source-pdos =
> +                               <PDO_FIXED(5000, 1500, PDO_FIXED_USB_COMM)>;
> +
> +                       altmodes {
> +                               displayport {
> +                                       svid = /bits/ 16 <0xff01>;
> +                                       vdo = <0x00001c46>;
> +                               };
> +                       };
> +
> +                       ports {
> +                               #address-cells = <1>;
> +                               #size-cells = <0>;
> +
> +                               port@0 {
> +                                       reg = <0>;
> +
> +                                       usbc_hs: endpoint {
> +                                               remote-endpoint = <&u2phy0_typec_hs>;
> +                                       };
> +                               };
> +

Why USB2 PHY needs to be notified for Type-C connection?

> +                               port@1 {
> +                                       reg = <1>;
> +
> +                                       usbc_ss: endpoint {
> +                                               remote-endpoint = <&tcphy0_typec_ss>;
> +                                       };
> +                               };
> +
> +                               port@2 {
> +                                       reg = <2>;
> +
> +                                       usbc_dp: endpoint {
> +                                               remote-endpoint = <&tcphy0_typec_dp>;
> +                                       };
> +                               };
> +                       };
> +               };
> +       };
> +};
> +

.....
>
>  &u2phy0 {
>         status = "okay";
> +
> +       port {
> +               u2phy0_typec_hs: endpoint {
> +                       remote-endpoint = <&usbc_hs>;
> +               };
> +       };
>  };
>

There is no switch and mux, how to co-work with Type-C?

Best regards,
Peter