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

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Date:   Tue, 11 Dec 2018 13:46:51 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Roger Quadros <rogerq@...com>, Pawel Laszczak <pawell@...ence.com>,
        devicetree@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, adouglas@...ence.com,
        jbergsagel@...com, nsekhar@...com, nm@...com, sureshp@...ence.com,
        peter.chen@....com, pjez@...ence.com, kurahul@...ence.com
Subject: Re: [PATCH v1 2/2] usb:cdns3 Add Cadence USB3 DRD Driver


Hi,

Roger Quadros <rogerq@...com> writes:
>> 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

no, no. This is fine. We _could_ split out PCI glue to its own patch,
but it's rather pointless seing as it's so small.

-- 
balbi

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