linux-kernel - Re: [PATCH v6 5/6] can: ctucanfd: CTU CAN FD open-source IP core

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Date:   Thu, 22 Oct 2020 18:06:19 +0200
From:   Pavel Pisa <pisa@....felk.cvut.cz>
To:     Pavel Machek <pavel@....cz>
Cc:     linux-can@...r.kernel.org, devicetree@...r.kernel.org,
        "Marc Kleine-Budde" <mkl@...gutronix.de>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        David Miller <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>, 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>,
        Drew Fustini <pdp7pdp7@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH v6 5/6] can: ctucanfd: CTU CAN FD open-source IP core - platform/SoC support.

Hello Pavel,

thanks for review.

On Thursday 22 of October 2020 13:43:06 Pavel Machek wrote:
> Hi!
>
> > +++ 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 || COMPILE_TEST
> > +	help
>
> This is likely wrong, as it can enable config of CAN_CTUCANFD=M,
> CAN_CTUCANFD_PLATFORM=y, right?

My original code has not || COMPILE_TEST alternative.

But I have been asked to add it

On Sunday 16 of August 2020 01:28:13 Randy Dunlap wrote:
> Can this be
>         depends on OF || COMPILE_TEST
> ?

I have send discussion later that I am not sure if it is right
but followed suggestion. If there is no other reply now,
I would drop || COMPILE_TEST. I believe that then it is correct
for regular use. I ma not sure about all consequences of COMPILE_TEST
missing.

> > @@ -8,3 +8,6 @@ ctucanfd-y := ctu_can_fd.o ctu_can_fd_hw.o
> >
> >  obj-$(CONFIG_CAN_CTUCANFD_PCI) += ctucanfd_pci.o
> >  ctucanfd_pci-y := ctu_can_fd_pci.o
> > +
> > +obj-$(CONFIG_CAN_CTUCANFD_PLATFORM) += ctucanfd_platform.o
> > +ctucanfd_platform-y += ctu_can_fd_platform.o
>
> Can you simply add right object files directly?

This is more tough question. We have kept sources
as ctu_can_fd.c, ctu_can_fd_hw.c etc. to produce
final ctucanfd.ko which matches device tree entry etc.
after name simplification now...
So we move from underscores to ctucanfd on more places.
So yes, we can rename ctu_can_fd.c to ctucanfd_drv.c + others
keep final ctucanfd.ko and change to single file based objects
ctucanfd_platform.c and ctucanfd_pci.c

If you think that it worth to be redone, I would do that.
It would disrupt sources history, may it be blames, merging
etc... but I would invest effort into it if asked for. 

Best wishes,

                Pavel