linux-kernel - Re: [PATCH v7 5/9] usb: dwc3: core: Refactor PHY logic to support Multiport Controller

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Message-ID: <ZFJBN2i5tXkY8ARA@hovoldconsulting.com>
Date:   Wed, 3 May 2023 13:10:47 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Krishna Kurapati <quic_kriskura@...cinc.com>
Cc:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Felipe Balbi <balbi@...nel.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        quic_pkondeti@...cinc.com, quic_ppratap@...cinc.com,
        quic_jackp@...cinc.com, quic_harshq@...cinc.com,
        ahalaney@...hat.com, quic_shazhuss@...cinc.com
Subject: Re: [PATCH v7 5/9] usb: dwc3: core: Refactor PHY logic to support
 Multiport Controller

On Mon, May 01, 2023 at 08:04:41PM +0530, Krishna Kurapati wrote:
> Currently the DWC3 driver supports only single port controller
> which requires at most one HS and 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 phy's supported
> by a multiport controller and limit the max number of ports
> supported to 4.
> 
> Signed-off-by: Harsh Agarwal <quic_harshq@...cinc.com>
> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
> ---
>  drivers/usb/dwc3/core.c | 262 +++++++++++++++++++++++++++++-----------
>  drivers/usb/dwc3/core.h |  12 +-
>  drivers/usb/dwc3/drd.c  |  13 +-
>  3 files changed, 209 insertions(+), 78 deletions(-)

Note that this patch no longer applies and you need to rebase the series
on mainline (e.g. including commit 1d72fab47656 ("USB: dwc3: refactor
phy handling").

Johan