linux-kernel - Re: [PATCH v4 15/18] dt-bindings: usb: Add ports to google,cros-ec-typec for DP altmode

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Message-ID: <CAE-0n52F+cvVyXm8g8idN2eMfx4bpaEpWQRchr8=AO87N7E3fg@mail.gmail.com>
Date: Wed, 11 Dec 2024 13:11:14 -0800
From: Stephen Boyd <swboyd@...omium.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	patches@...ts.linux.dev, devicetree@...r.kernel.org, 
	Douglas Anderson <dianders@...omium.org>, Pin-yen Lin <treapking@...omium.org>, 
	Andrzej Hajda <andrzej.hajda@...el.com>, Benson Leung <bleung@...omium.org>, 
	Conor Dooley <conor+dt@...nel.org>, Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...il.com>, 
	dri-devel@...ts.freedesktop.org, Guenter Roeck <groeck@...omium.org>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Jonas Karlman <jonas@...boo.se>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Lee Jones <lee@...nel.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Prashant Malani <pmalani@...omium.org>, 
	Robert Foss <rfoss@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Tzung-Bi Shih <tzungbi@...nel.org>, 
	Alexandre Belloni <alexandre.belloni@...tlin.com>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Daniel Scally <djrscally@...il.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>, Ivan Orlov <ivan.orlov0322@...il.com>, 
	linux-acpi@...r.kernel.org, linux-usb@...r.kernel.org, 
	Mika Westerberg <mika.westerberg@...ux.intel.com>, 
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>, Sakari Ailus <sakari.ailus@...ux.intel.com>, 
	Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v4 15/18] dt-bindings: usb: Add ports to
 google,cros-ec-typec for DP altmode

Quoting Dmitry Baryshkov (2024-12-05 10:47:08)
> On Tue, Dec 03, 2024 at 03:50:58PM -0800, Stephen Boyd wrote:
> >
> > The easiest way to imagine this is that we took the usb-c-connector and
> > jammed an HDMI dongle in there with some glue so that it can never be
> > removed. There isn't any USB going there either because it can't be
> > used. I suppose we can continue to describe this with an
> > altmodes/displayport node but then add some compatible like
> > "usb-c-hdmi-connector" or another property to the altmodes/displayport
> > node like "type = hdmi" that signifies this is a connector that only
> > outputs HDMI.
>
> Does that DP-to-HDMI bridge talk USB-C or just pure DP? In other words,
> will it be properly discovered and handled if we just leave it as a
> weird usb-c-connector (maybe with an additional annotation, we have
> USB_PORT_CONNECT_TYPE_HARD_WIRED for USB ports, we might have something
> similar for Type-C connectors).

It is pure DP. Maybe we can have a google,cros-ec-usbc-hdmi compatible
string here because this is a weird design.