linux-kernel - Re: [RFC v2 1/5] UDC: Split the driver into amd (pci) and Synopsys core driver

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Date:   Mon, 23 Jan 2017 18:35:30 +0530
From:   Raviteja Garimella <raviteja.garimella@...adcom.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        linux-usb@...r.kernel.org
Subject: Re: [RFC v2 1/5] UDC: Split the driver into amd (pci) and Synopsys
 core driver

Hi Florian,

On Fri, Jan 20, 2017 at 12:58 AM, Florian Fainelli <f.fainelli@...il.com> wrote:
> On 01/19/2017 02:44 AM, Raviteja Garimella wrote:
>> Hi,
>>
>> On Thu, Jan 19, 2017 at 12:15 AM, Florian Fainelli <f.fainelli@...il.com> wrote:
>>> On 01/17/2017 12:05 AM, Raviteja Garimella wrote:
>>>> This patch splits the amd5536udc driver into two -- one that does
>>>> pci device registration and the other file that does the rest of
>>>> the driver tasks like the gadget/ep ops etc for Synopsys UDC.
>>>>
>>>> This way of splitting helps in exporting core driver symbols which
>>>> can be used by any other platform/pci driver that is written for
>>>> the same Synopsys USB device controller.
>>>>
>>>> The current patch also includes a change in the Kconfig and Makefile.
>>>> A new config option USB_SNP_CORE will be selected automatically when
>>>> any one of the platform or pci driver for the same UDC is selected.
>>>>
>>>> Signed-off-by: Raviteja Garimella <raviteja.garimella@...adcom.com>
>>>
>>> Although the changes you have done make sense and it is most certainly a
>>> good idea to split udc core from bus specific glue logic, it is really
>>> hard to review the changes per-se because of the file rename, could that
>>> happen at a later time?
>>
>> If you start looking at this specific patch from the header file (amd5536udc.h),
>> the additions in there comprise of:
>> - 9 function declarations
>> - some module parameter variable declarations that's moved out from the older
>>   common file amd5536udc.c
>> - 2 #includes that are needed by all files.
>
> Well, I don't really question the changes themselves, rather how this is
> presented as a patch series to reviewers.
>
> What I would do, to help introduce both the rename, and the splitting of
> core vs. bus-glue specific changes is:
>
> - have an initial patch which extracts the core functionality of the
> driver and the PCI bus glue logic into adm5536udc_pci.c and left
> adm5536udc.c intact (that would be a small delta to review)
>
> - have a second patch that performs the file rename from adm5536udc.c
> into snps_udc_core.c and updates adm5536udc_pci.c eventually as a result
> of that, then again, a reviewer can ignore the rename part (don't format
> to generate your patches with git format-patch -M in that case) and just
> focus on the conversion part for adm5536udc_pci.c
>

Just waited for any more comments coming in. I will submit the next version
as PATCH like the way you suggested.

>>
>> So, basically what's done for this split is that:
>> 1. the static keyword is removed from those 9 functions in the new file
>>     snps_udc_core.c and are exported.
>> 2. The module parameters declarations (since they are used in both core
>>     and pci file) are moved to the header file now.
>
> These should really be part of the commit messages for each commit doing
> the changes, this is meant to help a reviewer understand what you are
> doing, and to some degree, will help him/her make an educated decision
> as to what part of the code the focus should be put on.
>

Will do.

Thanks,
Ravi

> Thanks
> --
> Florian