linux-kernel - Re: [PATCH v2 0/3] Refactor xhci quirks and plat private data

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Date:   Tue, 22 Mar 2022 17:53:42 +0200
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     "Sandeep Maheswaram (Temp)" <quic_c_sanm@...cinc.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Pawel Laszczak <pawell@...ence.com>,
        Peter Chen <peter.chen@...nel.org>,
        Roger Quadros <rogerq@...nel.org>,
        Aswath Govindraju <a-govindraju@...com>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_pkondeti@...cinc.com,
        quic_ppratap@...cinc.com
Subject: Re: [PATCH v2 0/3] Refactor xhci quirks and plat private data

On 21.3.2022 8.21, Sandeep Maheswaram (Temp) wrote:
> Hi Mathias,
> 
> On 3/18/2022 5:29 PM, Greg Kroah-Hartman wrote:
>> On Thu, Mar 17, 2022 at 11:17:17AM +0530, Sandeep Maheswaram (Temp) wrote:
>>> Hi Greg,
>>>
>>> On 3/1/2022 3:58 PM, Sandeep Maheswaram wrote:
>>>> changes in v2:
>>>> Added a PATCH 2/3 to remove unwanted header inclusion.
>>>> Fixed minor nitpicks in PATCH 3/3.
>>>>
>>>> Pavankumar Kondeti (1):
>>>>     usb: xhci: refactor quirks and plat private data
>>>>
>>>> Sandeep Maheswaram (2):
>>>>     usb: xhci: Remove unwanted header inclusion
>>>>     usb: dwc: host: add xhci_plat_priv quirk XHCI_SKIP_PHY_INIT
>>>>
>>>>    drivers/usb/cdns3/host.c        |  2 +-
>>>>    drivers/usb/dwc3/host.c         | 13 ++++++++
>>>>    drivers/usb/host/xhci-plat.c    |  3 +-
>>>>    drivers/usb/host/xhci-plat.h    | 24 ---------------
>>>>    drivers/usb/host/xhci-rcar.c    |  3 +-
>>>>    drivers/usb/host/xhci.h         | 60 ++++--------------------------------
>>>>    include/linux/usb/xhci-plat.h   | 24 +++++++++++++++
>>>>    include/linux/usb/xhci-quirks.h | 67 +++++++++++++++++++++++++++++++++++++++++
>>>>    8 files changed, 115 insertions(+), 81 deletions(-)
>>>>    delete mode 100644 drivers/usb/host/xhci-plat.h
>>>>    create mode 100644 include/linux/usb/xhci-plat.h
>>>>    create mode 100644 include/linux/usb/xhci-quirks.h
>>> Please let me know your opinion about this patch series.
>> I need the xhci maintainer to review it...
>>
>> thanks,
>>
>> greg k-h
> 
> 
> Can you please review this patch series.
> 

I don't have a better solution than this.

So neither devicetree or ACPI entries exists for the xHC part of this dwc3 controller?

A pure platform device is created, and it matches and binds to xhci-plat driver by "xhci-hcd" name.
I guess we have no way to identify this dwc3 xhci controller in xhci-plat.c, and set quirks there,
like all those devicetree xhci devices that we set quirks based on .compatibility. 

Thanks
Mathias