linux-kernel - Re: [PATCH] drm/bridge: anx7625: Add anx7625 port switching.

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Message-ID: <20201112090959.GC1367855@google.com>
Date:   Thu, 12 Nov 2020 01:09:59 -0800
From:   Prashant Malani <pmalani@...omium.org>
To:     Pi-Hsun Shih <pihsun@...omium.org>
Cc:     Nicolas Boichat <drinkcat@...omium.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Xin Ji <xji@...logixsemi.com>,
        Sam Ravnborg <sam@...nborg.org>,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>,
        heikki.krogerus@...ux.intel.com
Subject: Re: [PATCH] drm/bridge: anx7625: Add anx7625 port switching.


On Thu, Nov 12, 2020 at 05:07:05PM +0800, Pi-Hsun Shih wrote:
> Hi Prashant,
> 
> Please see inline reply as below.
> 
> On Thu, Nov 12, 2020 at 4:59 PM Prashant Malani <pmalani@...omium.org> wrote:
> >
> > Hi Pi-Hsun,
> >
> > I haven't gone through the code, but did have a high-level comment
> > (kindly see inline)
> >
> > On Thu, Nov 12, 2020 at 02:40:40PM +0800, Pi-Hsun Shih wrote:
> > > When output 2 lanes DP data, anx7625 can output to either TX1/RX1 or
> > > TX2/RX2. In typical usage, these two TX/RX pairs corresponds to two
> > > orientations of typec.
> > >
> > > On some board one anx7625 is used as DPI to DP converter for two typec
> > > ports. In this case, the TX1/RX1 and TX2/RX2 are connected to two usb
> > > muxes, which mux the DP data with the rest of the USB3 data, and
> > > connects to the two typec ports.
> > >
> > > This patch adds option for anx7625 to acts as a usb typec switch and
> > > switch output lanes based on the typec orientation, or acts as two usb
> > > typec mux and switch output lanes depending on whether the two ports
> > > currently has DP enabled.
> > >
> > > Signed-off-by: Pi-Hsun Shih <pihsun@...omium.org>
> > >
> > > ====================================================================
> > >
> > > This is an attempt to use typec framework with how we're using anx7625
> > > on Chrome OS asurada board.
> > >
> > > An example of the dts for the two ports case can be found at
> > > https://crrev.com/c/2507199/6
> >
> > Do you plan on submitting DT schemas & bindings documentation for the switch(es)
> > that are intended to be used?
> 
> Yes I plan to submit corresponding DT schemas & bindings documentation
> changes if this change looks good.
> 

That's great. Thanks for confirming :)


BR,

-Prashant