linux-kernel - RE: [PATCH v1 2/2] usb:cdns3 Add Cadence USB3 DRD Driver

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Date:   Tue, 11 Dec 2018 10:01:02 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Roger Quadros <rogerq@...com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "balbi@...nel.org" <balbi@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alan Douglas <adouglas@...ence.com>,
        "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 v1 2/2] usb:cdns3 Add Cadence USB3 DRD Driver

Hi,

>On 10/12/18 14:39, 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.
>>
>> 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         |   16 +
>>  drivers/usb/cdns3/cdns3-pci-wrap.c |  157 +++
>>  drivers/usb/cdns3/core.c           |  451 +++++++
>>  drivers/usb/cdns3/core.h           |  108 ++
>>  drivers/usb/cdns3/debug.h          |  346 ++++++
>>  drivers/usb/cdns3/debugfs.c        |  168 +++
>>  drivers/usb/cdns3/drd.c            |  315 +++++
>>  drivers/usb/cdns3/drd.h            |  129 ++
>>  drivers/usb/cdns3/ep0.c            |  864 +++++++++++++
>>  drivers/usb/cdns3/gadget-export.h  |   28 +
>>  drivers/usb/cdns3/gadget.c         | 1802 ++++++++++++++++++++++++++++
>>  drivers/usb/cdns3/gadget.h         | 1177 ++++++++++++++++++
>>  drivers/usb/cdns3/host-export.h    |   28 +
>>  drivers/usb/cdns3/host.c           |   74 ++
>>  drivers/usb/cdns3/trace.c          |   11 +
>>  drivers/usb/cdns3/trace.h          |  343 ++++++
>
>You went to the other extreme of combining everything (host/gadget/drd) together
>which again makes this very hard to review.
>
>I think what Felipe meant was to only combine the gadget driver code into one patch.
>
>The series could be split into 6 patches like so.
>-dt binding
>-pci glue
>-core driver
>-host driver
>-gadget driver
>-drd driver

Felipe wrote:
" 
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.
"

Felipe should I split this driver as suggested by Roger ?. 
Now it's very big patch but it's still a single driver.


>>  19 files changed, 6065 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
>>
><snip>
>
Cheers 
Pawel