linux-kernel - Re: [PATCH v16 4/9] usb: dwc3: core: Refactor PHY logic to support Multiport Controller

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Date: Mon, 25 Mar 2024 13:33:00 +0100
From: Johan Hovold <johan@...nel.org>
To: Krishna Kurapati <quic_kriskura@...cinc.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Wesley Cheng <quic_wcheng@...cinc.com>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Felipe Balbi <balbi@...nel.org>, devicetree@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, quic_ppratap@...cinc.com,
	quic_jackp@...cinc.com
Subject: Re: [PATCH v16 4/9] usb: dwc3: core: Refactor PHY logic to support
 Multiport Controller

On Thu, Mar 07, 2024 at 11:50:47AM +0530, Krishna Kurapati wrote:
> Currently the DWC3 driver supports only single port controller
> which requires at least one HS PHY and at most one SS PHY.
> 
> But the DWC3 USB controller can be connected to multiple ports and
> each port can have their own PHYs. Each port of the multiport
> controller can either be HS+SS capable or HS only capable
> Proper quantification of them is required to modify GUSB2PHYCFG
> and GUSB3PIPECTL registers appropriately.
> 
> Add support for detecting, obtaining and configuring PHYs supported
> by a multiport controller. Limit support to multiport controllers
> with up to four ports for now (e.g. as needed for SC8280XP).
> 
> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>

Reviewed-by: Johan Hovold <johan+linaro@...nel.org>