linux-kernel - Re: [PATCH v5 6/9] dt/bindings: drm/bridge: it6505: Add mode-switch support

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Date:   Thu, 23 Jun 2022 14:24:13 -0400
From:   Stephen Boyd <swboyd@...omium.org>
To:     Prashant Malani <pmalani@...omium.org>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Cc:     bleung@...omium.org, heikki.krogerus@...ux.intel.com,
        Pin-Yen Lin <treapking@...omium.org>,
        Allen Chen <allen.chen@....com.tw>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        José Expósito <jose.exposito89@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Maxime Ripard <maxime@...no.tech>,
        Neil Armstrong <narmstrong@...libre.com>,
        Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>, Robert Foss <robert.foss@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Xin Ji <xji@...logixsemi.com>
Subject: Re: [PATCH v5 6/9] dt/bindings: drm/bridge: it6505: Add mode-switch support

Quoting Prashant Malani (2022-06-22 10:34:35)
> From: Pin-Yen Lin <treapking@...omium.org>
>
> ITE IT6505 can be used in systems to switch USB Type-C DisplayPort
> alternate mode lane traffic between 2 Type-C ports.

How does it work? From what I can tell from the information I find when
googling this part[1] and looking at the existing binding doc is that
this device is a DPI to DP bridge, and it outputs DP (probably 4 lanes
of it?). Does the 2 type-c port design work by transmitting DP on two
lanes of DP for one type-c port and another two lanes of DP for the
other type-c port?

DP could be one lane, so if this device is able to output one lane on
any output differential pair then I suspect it could support 4 type-c
ports if the hardware engineer connected it that way. Can you confirm my
suspicion?

[1] https://www.ite.com.tw/en/product/view?mid=45