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Date:   Tue, 25 Aug 2020 08:10:43 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Pavel Pisa <pisa@....felk.cvut.cz>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Drew Fustini <pdp7pdp7@...il.com>
Cc:     linux-can@...r.kernel.org, devicetree@...r.kernel.org,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        David Miller <davem@...emloft.net>, mark.rutland@....com,
        Carsten Emde <c.emde@...dl.org>, armbru@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marin Jerabek <martin.jerabek01@...il.com>,
        Ondrej Ille <ondrej.ille@...il.com>,
        Jiri Novak <jnovak@....cvut.cz>,
        Jaroslav Beran <jara.beran@...il.com>,
        Petr Porazil <porazil@...ron.com>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH v5 5/6] can: ctucanfd: CTU CAN FD open-source IP core -
 platform and next steps and mainlining chances

On 8/25/20 2:25 AM, Pavel Pisa wrote:
> Hello Randy and Rob,
> 
> thanks much for review, I have corrected FPGA spelling
> and binding YAML license.
> 
> On Sunday 16 of August 2020 01:28:13 Randy Dunlap wrote:
>> On 8/15/20 12:43 PM, Pavel Pisa wrote:
>>> diff --git a/drivers/net/can/ctucanfd/Kconfig
>>> b/drivers/net/can/ctucanfd/Kconfig index e1636373628a..a8c9cc38f216
>>> 100644
>>> --- a/drivers/net/can/ctucanfd/Kconfig
>>> +++ b/drivers/net/can/ctucanfd/Kconfig
>>> @@ -21,4 +21,15 @@ config CAN_CTUCANFD_PCI
>>>  	  PCIe board with PiKRON.com designed transceiver riser shield is
>>> available at https://gitlab.fel.cvut.cz/canbus/pcie-ctu_can_fd .
>>>
>>> +config CAN_CTUCANFD_PLATFORM
>>> +	tristate "CTU CAN-FD IP core platform (FPGA, SoC) driver"
>>> +	depends on OF
>>
>> Can this be
>> 	depends on OF || COMPILE_TEST
>> ?
> 
> I am not sure for this change. Is it ensured/documented somewhere that
> header files provide dummy definition such way, that OF drivers builds
> even if OF support is disabled? If I remember well, CTU CAN FD OF
> module build fails if attempted in the frame of native x86_64
> build where OF has been disabled. Does COMPILE_TEST ensure that
> such build succeeds.
> 

COMPILE_TEST won't ensure anything.
OTOH, <linux/of.h> has lots of stubs for handling the case of
CONFIG_OF not being enabled.

-- 
~Randy

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