linux-kernel - Re: [PATCH v5 1/3] dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp-phy: Document lanes mapping when not using in USB-C complex

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Message-ID: <176004157616.3295945.3989144090466748168.robh@kernel.org>
Date: Thu, 9 Oct 2025 15:26:16 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	Bjorn Andersson <andersson@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Xilin Wu <sophon@...xa.com>,
	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	linux-phy@...ts.infradead.org, Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>
Subject: Re: [PATCH v5 1/3] dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp-phy:
 Document lanes mapping when not using in USB-C complex


On Mon, 06 Oct 2025 15:55:03 +0200, Neil Armstrong wrote:
> The QMP USB3/DP Combo PHY hosts an USB3 phy and a DP PHY on top
> of a combo glue to route either lanes to the 4 shared physical lanes.
> 
> The routing of the lanes can be:
> - 2 DP + 2 USB3
> - 4 DP
> - 2 USB3
> 
> The layout of the lanes was designed to be mapped and swapped
> related to the USB-C Power Delivery negociation, so it supports
> a finite set of mappings inherited by the USB-C Altmode layouts.
> 
> Nevertheless those QMP Comby PHY can be used to drive a DisplayPort
> connector, DP->HDMI bridge, USB3 A Connector, etc... without
> an USB-C connector and no PD events.
> 
> Document the data-lanes on numbered port@0 out endpoints,
> allowing us to document the lanes mapping to DisplayPort
> and/or USB3 connectors/peripherals.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  .../phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml         | 69 +++++++++++++++++++++-
>  1 file changed, 68 insertions(+), 1 deletion(-)
> 

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