linux-kernel - Re: [PATCH v2 1/3] dt-bindings: usb: fsa4480: Add data-lanes property to endpoint

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Date:   Tue, 24 Oct 2023 14:33:39 -0500
From:   Rob Herring <robh@...nel.org>
To:     Luca Weiss <luca.weiss@...rphone.com>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-kernel@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
        linux-usb@...r.kernel.org, Bjorn Andersson <andersson@...nel.org>,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: usb: fsa4480: Add data-lanes
 property to endpoint


On Fri, 20 Oct 2023 11:33:18 +0200, Luca Weiss wrote:
> Allow specifying data-lanes to reverse the muxing orientation between
> AUX+/- and SBU1/2 where necessary by the hardware design.
> 
> In the mux there's a switch that needs to be controlled from the OS, and
> it either connects AUX+ -> SBU1 and AUX- -> SBU2, or the reverse: AUX+
> -> SBU2 and AUX- -> SBU1, depending on the orientation of how the USB-C
> connector is plugged in.
> 
> With this data-lanes property we can now specify that AUX+ and AUX-
> connections are swapped between the SoC and the mux, therefore the OS
> needs to consider this and reverse the direction of this switch in the
> mux.
> 
> _______          _______
>       |          |     |
>       |-- HP   --|     |
>       |-- MIC  --|     |or
> SoC   |          | MUX |-- SBU1 --->  To the USB-C
> Codec |-- AUX+ --|     |-- SBU2 --->  connected
>       |-- AUX- --|     |
> ______|          |_____|
> 
> (thanks to Neil Armstrong for this ASCII art)
> 
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---
>  .../devicetree/bindings/usb/fcs,fsa4480.yaml       | 29 +++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh@...nel.org>