linux-kernel - Re: [PATCH v4 1/4] fpga: dfl: reorganize to subdir layout

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Date:   Tue, 15 Jun 2021 13:48:26 -0700
From:   Tom Rix <trix@...hat.com>
To:     "Wu, Hao" <hao.wu@...el.com>, "mdf@...nel.org" <mdf@...nel.org>,
        "corbet@....net" <corbet@....net>,
        "michal.simek@...inx.com" <michal.simek@...inx.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "krzysztof.kozlowski@...onical.com" 
        <krzysztof.kozlowski@...onical.com>,
        "nava.manne@...inx.com" <nava.manne@...inx.com>,
        "Xu, Yilun" <yilun.xu@...el.com>,
        "davidgow@...gle.com" <davidgow@...gle.com>,
        "fpacheco@...hat.com" <fpacheco@...hat.com>,
        "Gong, Richard" <richard.gong@...el.com>,
        "luca@...aceresoli.net" <luca@...aceresoli.net>
Cc:     "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 1/4] fpga: dfl: reorganize to subdir layout


On 6/15/21 1:08 AM, Wu, Hao wrote:
>> Subject: [PATCH v4 1/4] fpga: dfl: reorganize to subdir layout
>>
>> From: Tom Rix <trix@...hat.com>
>>
>> Follow drivers/net/ethernet/ which has control configs
>> NET_VENDOR_BLA that map to drivers/net/ethernet/bla
>> Since fpgas do not have many vendors, drop the 'VENDOR' and use
>> FPGA_BLA.
> Hi Tom,
>
> Thanks for this patch. : )
>
> DFL is not a vendor, but something can be shared/reused. It's possible that
> other vendors reuse the same concepts and the drivers of DFL. If vendor
> drivers need to be moved inside sub folders, then maybe it's better to
> leave DFL in the parent folder?

xrt is also not a vendor, more a subdevice framework like dfl.

I am not sure what you mean by other dfl vendors can you give an example ?

>> There are several new subdirs
>> altera/
>> dfl/
>> lattice/
>> xilinx/
>>
>> Each subdir has a Kconfig that has a new/reused
>>
>> if FPGA_BLA
>>    ... existing configs ...
>> endif FPGA_BLA
>>
>> Which is sourced into the main fpga/Kconfig
>>
>> Each subdir has a Makefile whose transversal is controlled in the
>> fpga/Makefile by
>>
>> obj-$(CONFIG_FPGA_BLA) += bla/
>>
>> This is the dfl/ subdir part.
>>
>> Create a dfl/ subdir
>> Move dfl-* files to it.
>> Add a Kconfig and Makefile
>>
>> Because FPGA_DFL is now used in dfl/Kconfig in a if/endif
>> block, all the other configs in dfl/Kconfig implicitly depend
>> on FPGA_DFL.  So the explicit dependence can be removed.  Also
>> since FPGA_DFL depends on HAS_IOMEM, it can be removed from the
>> other configs.
> Hm.. sounds like this change (remove HAS_IOMEM) is better to be split
> into another patch. How do you think?

I'll drop this from the patchset so this so patchset does the one thing 
of moving stuff around and do the HAS_IOMEM change after stuff settles.

Tom

>
> Thanks
> Hao
>