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Message-ID: <169817601855.430514.5700076619485106727.robh@kernel.org>
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>
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