linux-kernel - RE: [PATCH v3 5/6] usb:cdns3 Add Cadence USB3 DRD Driver

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Date:   Tue, 5 Feb 2019 08:33:04 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "rogerq@...com" <rogerq@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jbergsagel@...com" <jbergsagel@...com>,
        "nsekhar@...com" <nsekhar@...com>, "nm@...com" <nm@...com>,
        Suresh Punnoose <sureshp@...ence.com>,
        "peter.chen@....com" <peter.chen@....com>,
        Pawel Jez <pjez@...ence.com>, Rahul Kumar <kurahul@...ence.com>
Subject: RE: [PATCH v3 5/6] usb:cdns3 Add Cadence USB3 DRD Driver

Hi,

>On Thu, Jan 31, 2019 at 11:52:32AM +0000, Pawel Laszczak wrote:
>> This patch introduce new Cadence USBSS DRD driver
>> to linux kernel.
>>
>> The Cadence USBSS DRD Driver is a highly
>> configurable IP Core which can be
>> instantiated as Dual-Role Device (DRD),
>> Peripheral Only and Host Only (XHCI)
>> configurations.
>>
>> The current driver has been validated with
>> FPGA burned. We have support for PCIe
>> bus, which is used on FPGA prototyping.
>>
>> The host side of USBSS-DRD controller is compliance
>> with XHCI specification, so it works with
>> standard XHCI linux driver.
>
>Please line-wrap this properly at 72 columns, like your editor asks you
>to when you run git :)
>
>>
>> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
>> ---
>>  drivers/usb/Kconfig                |    2 +
>>  drivers/usb/Makefile               |    2 +
>>  drivers/usb/cdns3/Kconfig          |   44 +
>>  drivers/usb/cdns3/Makefile         |   14 +
>>  drivers/usb/cdns3/cdns3-pci-wrap.c |  155 +++
>>  drivers/usb/cdns3/core.c           |  403 ++++++
>>  drivers/usb/cdns3/core.h           |  116 ++
>>  drivers/usb/cdns3/debug.h          |  168 +++
>>  drivers/usb/cdns3/debugfs.c        |  164 +++
>>  drivers/usb/cdns3/drd.c            |  365 +++++
>>  drivers/usb/cdns3/drd.h            |  162 +++
>>  drivers/usb/cdns3/ep0.c            |  907 +++++++++++++
>>  drivers/usb/cdns3/gadget-export.h  |   28 +
>>  drivers/usb/cdns3/gadget.c         | 1985 ++++++++++++++++++++++++++++
>>  drivers/usb/cdns3/gadget.h         | 1207 +++++++++++++++++
>>  drivers/usb/cdns3/host-export.h    |   28 +
>>  drivers/usb/cdns3/host.c           |   72 +
>>  drivers/usb/cdns3/trace.c          |   23 +
>>  drivers/usb/cdns3/trace.h          |  404 ++++++
>>  19 files changed, 6249 insertions(+)
>>  create mode 100644 drivers/usb/cdns3/Kconfig
>>  create mode 100644 drivers/usb/cdns3/Makefile
>>  create mode 100644 drivers/usb/cdns3/cdns3-pci-wrap.c
>>  create mode 100644 drivers/usb/cdns3/core.c
>>  create mode 100644 drivers/usb/cdns3/core.h
>>  create mode 100644 drivers/usb/cdns3/debug.h
>>  create mode 100644 drivers/usb/cdns3/debugfs.c
>>  create mode 100644 drivers/usb/cdns3/drd.c
>>  create mode 100644 drivers/usb/cdns3/drd.h
>>  create mode 100644 drivers/usb/cdns3/ep0.c
>>  create mode 100644 drivers/usb/cdns3/gadget-export.h
>>  create mode 100644 drivers/usb/cdns3/gadget.c
>>  create mode 100644 drivers/usb/cdns3/gadget.h
>>  create mode 100644 drivers/usb/cdns3/host-export.h
>>  create mode 100644 drivers/usb/cdns3/host.c
>>  create mode 100644 drivers/usb/cdns3/trace.c
>>  create mode 100644 drivers/usb/cdns3/trace.h
>
>This is way too big to try to review all at once.  You need to break
>this up into logical chunks, each one adding a single functionality to
>make it possible to actually review it.
>

In the past driver was split into series of patch, but it was difficult to review for other 
reviewers so I made decision to prepare it in this way. 
The short discuss you can find on https://lkml.org/lkml/2018/11/30/502.

Quotation: "
>> Frankly, I don't understand why this is a series. It's a single driver and splitting it into
>> a series just makes it more difficult to review, actually.
>>
>> Sure, a single patch will be large, but there's no way to have a functional driver until
>> all patches are applied, anyway.
>>
>
>Yes, I agree with Felipe. Pawel, you could remove the "RFC" prefix, and send the whole
>one as one patch. I will test it at my hardware.

Ok, I will prepare such single patch.  
Peter I know that you have little different platform. 
Probably you should made some additional changes for your platform.
"

Thanks

Pawel Laszczak.