linux-kernel - Re: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers

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Message-ID: <4b34735f-8e1f-bf37-398f-9b4a8aa2e939@linux.intel.com>
Date:   Wed, 20 Apr 2022 16:20:52 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     "Sandeep Maheswaram (Temp) (QUIC)" <quic_c_sanm@...cinc.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Pavan Kumar Kondeti (QUIC)" <quic_pkondeti@...cinc.com>,
        "Pratham Pratap (QUIC)" <quic_ppratap@...cinc.com>,
        "Krishna Kurapati PSSNV (QUIC)" <quic_kriskura@...cinc.com>,
        "Vidya Sagar Pulyala (Temp) (QUIC)" <quic_vpulyala@...cinc.com>
Subject: Re: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers

On 19.4.2022 13.17, Sandeep Maheswaram (Temp) (QUIC) wrote:
> Hi Mathias, Felipe,
> 
>> -----Original Message-----
>> From: Sandeep Maheswaram (Temp) (QUIC) <quic_c_sanm@...cinc.com>
>> Sent: Thursday, April 7, 2022 3:01 PM
>> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>; Felipe Balbi
>> <balbi@...nel.org>; Stephen Boyd <swboyd@...omium.org>; Doug
>> Anderson <dianders@...omium.org>; Matthias Kaehlcke
>> <mka@...omium.org>; Mathias Nyman <mathias.nyman@...el.com>
>> Cc: linux-arm-msm@...r.kernel.org; linux-usb@...r.kernel.org; linux-
>> kernel@...r.kernel.org; Pavan Kumar Kondeti (QUIC)
>> <quic_pkondeti@...cinc.com>; Pratham Pratap (QUIC)
>> <quic_ppratap@...cinc.com>; Krishna Kurapati PSSNV (QUIC)
>> <quic_kriskura@...cinc.com>; Vidya Sagar Pulyala (Temp) (QUIC)
>> <quic_vpulyala@...cinc.com>; Sandeep Maheswaram (Temp) (QUIC)
>> <quic_c_sanm@...cinc.com>
>> Subject: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers
>>
>> Runtime suspend of phy drivers was failing from DWC3 driver as runtime
>> usage value is 2 because the phy is initialized from
>> DWC3 core and HCD core.
>> Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
>> This property can be set to avoid phy initialization in HCD core.
>>
>> v3:
>> Coming back to this series based on discussion at below thread
>> https://patchwork.kernel.org/project/linux-arm-msm/patch/1648103831-
>> 12347-4-git-send-email-quic_c_sanm@...cinc.com/
>> Dropped the dt bindings PATCH 1/3 in v2
>> https://patchwork.kernel.org/project/linux-arm-msm/cover/1636353710-
>> 25582-1-git-send-email-quic_c_sanm@...cinc.com/
>>
>> v2:
>> Updated the commit descriptions.
>> Changed subject prefix from dwc to dwc3.
>> Increased props array size.
>>
>> Sandeep Maheswaram (2):
>>   usb: host: xhci-plat: Add device property to set XHCI_SKIP_PHY_INIT
>>     quirk
>>   usb: dwc3: host: Set the property usb-skip-phy-init
>>
>>  drivers/usb/dwc3/host.c      | 4 +++-
>>  drivers/usb/host/xhci-plat.c | 3 +++
>>  2 files changed, 6 insertions(+), 1 deletion(-)
>>
>> --
>> 2.7.4
> 
> Please let me know your opinion about this series.

Otherwise looks good but wondering if we should document that new device
property somewhere. 

Couldn't find a standard way how those device properties excluded from
Documentation/devicetree/binding are documented

Thanks
-Mathias