linux-kernel - Re: [PATCH v7 3/3] mmc: Add driver for LiteX's LiteSDCard interface

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Message-ID: <YdjSI1R9qdnYHFNB@errol.ini.cmu.edu>
Date:   Fri, 7 Jan 2022 18:52:03 -0500
From:   "Gabriel L. Somlo" <gsomlo@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Karol Gugala <kgugala@...micro.com>,
        Mateusz Holenko <mholenko@...micro.com>,
        Kamil Rakoczy <krakoczy@...micro.com>,
        "mdudek@...ernships.antmicro.com" <mdudek@...ernships.antmicro.com>,
        Paul Mackerras <paulus@...abs.org>,
        Joel Stanley <joel@....id.au>,
        Stafford Horne <shorne@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "david.abdurachmanov@...ive.com" <david.abdurachmanov@...ive.com>,
        Florent Kermarrec <florent@...oy-digital.fr>,
        Randy Dunlap <rdunlap@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 3/3] mmc: Add driver for LiteX's LiteSDCard interface

On Sat, Jan 08, 2022 at 01:40:06AM +0200, Andy Shevchenko wrote:
> 
> 
> On Saturday, January 8, 2022, Andy Shevchenko <andy.shevchenko@...il.com>
> wrote:
> 
> 
> 
>     On Friday, January 7, 2022, Gabriel L. Somlo <gsomlo@...il.com> wrote:
> 
>         On Fri, Jan 07, 2022 at 10:50:02PM +0200, Andy Shevchenko wrote:
>         > > > +             .of_match_table = of_match_ptr(litex_match),
>         > >
>         > > You said "Wrong usage of of_match_ptr()" here, and all I have to go
>         by
>         > > is a bunch of other `drivers/mmc/host/*.c` files that use it in a
>         > > similar way, so can you please clarify and/or provide an example of
>         how
>         > > to do it properly?
>         >
>         > First of all, you have a dependency to OF, try to remove it and
>         > compile with OF=n and you will immediately see the issue. You may
>         also
>         > go for  `git log --no-merges --grep of_match_ptr` and analyze the
>         > result.
> 
>         Ah, grepping for "of_match_ptr" was *never* going to show me the
>         "right way of using of_match_ptr()" :)
> 
> 
> 
>     Hmm... this is strange. The above command is grepping in the commit
>     messages, and not in the code.
>      
> 
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/?qt=
> grep&q=of_match_ptr
> 
> Shows a lot of the commits that I referred to.
> 

Right. I was originally looking at *code* for current usage examples.

I get that you were referring to grepping through *commits*, which
seems to be the new way of figuring out what's canonical (as a lot of
the existing code seems to be in need of update :)

Thanks,
--Gabriel
  
> 
> 
>         OTOH, grepping for "of_match_table" (and of course the commits
>         returned by your command line) suggests that I simply should *not*
>         use it at all, and assign its argument directly to .of_match_table.
> 
>         Got it, fixed it, thanks!
> 
>         Now, on to the probe ordering issue... :)
> 
>         Thanks,
>         --G
> 
> 
> 
>     --
>     With Best Regards,
>     Andy Shevchenko
> 
> 
> 
> 
> 
> --
> With Best Regards,
> Andy Shevchenko
> 
>