linux-kernel - Re: [PATCH] mmc: remove another TMIO MMC variant usdhi6rol0.c

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Date:   Mon, 24 Jun 2019 09:03:52 +0200
From:   Lars Persson <lists@...h.nu>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rabin Vincent <rabin.vincent@...s.com>,
        Guennadi Liakhovetski <g.liakhovetski@....de>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] mmc: remove another TMIO MMC variant usdhi6rol0.c

On Fri, Jun 21, 2019 at 12:50 PM Wolfram Sang <wsa@...-dreams.de> wrote:
>
> Hi,
>
> On Fri, Jun 21, 2019 at 03:16:11PM +0900, Masahiro Yamada wrote:
> > (Added Lars Persson, Guennadi Liakhovetski)
> >
> > On Fri, Jun 21, 2019 at 3:06 PM Masahiro Yamada
> > <yamada.masahiro@...ionext.com> wrote:
> >
> > This needs Ack from Renesas.
> > But, I do not know if TMIO folks are sure about this driver, though.
> > (If they had been sure about it, they should not have duplicated the driver
> > in the first place.)
>
> ... and from the original mail:
>
> > Delete this driver now. Please re-implement it based on tmio_mmc_core.c
> > if needed.
>
> I was never happy with this driver existing, yet I never knew which HW
> platform needed this, so I didn't touch it. But I'd like to see it go in
> favor of merging with the TMIO code base.
>
> >
> > Perhaps, some code snippets in this driver might be useful for cleaning
> > tmio_mmc. It will stay in git history forever, and you can dig for it
> > whenever you need it.
> >
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>
> I double checked there is no user in the current tree. I also searched
> the web and did not find any out-of-tree user or even a reference of it.
>
> So, for now:
>
> Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
>
> But this seriously needs an Ack from Shimoda-san or Morimoto-san. And
> maybe Guennadi has remarks, too?
>

So let me tell you the real use of this driver.

It is used by Axis Communications in our Artpec-6 chips that will be
around for at least 5 years in active development at our side. The SoC
is upstreamed, but the upstreaming effort was side-tracked before the
usdhi6rol0 was added to the devicetree.

I do agree with you guys that we should not keep two drivers for the
same IP so there should be an effort to unify the drivers. In the mean
time, we can make the connection with Axis more explicit by assigning
us as maintainer and pushing the device tree entries.

BR,
 Lars