netdev - Re: [PATCH 0/3] Legacy clock drivers: Normalize clk API

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Message-ID: <CAMuHMdWozfKt87Gmy0yuZ+tUOv2ohTybkrb88evgWoyG8xfdgg@mail.gmail.com>
Date:   Mon, 11 Jun 2018 11:09:46 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Greg Ungerer <gerg@...ux-m68k.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        Corentin Labbe <clabbe@...libre.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] Legacy clock drivers: Normalize clk API

Hi Arnd,

On Mon, Jun 11, 2018 at 11:02 AM Arnd Bergmann <arnd@...db.de> wrote:
> On Mon, Jun 11, 2018 at 10:44 AM, Geert Uytterhoeven
> <geert@...ux-m68k.org> wrote:
> > When seeing commit bde4975310eb1982 ("net: stmmac: fix build failure due
> > to missing COMMON_CLK dependency"), I wondered why this dependency is
> > needed, as all implementations of the clock API should implement all
> > required functionality, or provide dummies.
> >
> > It turns out there were still two implementations that lacked the
> > clk_set_rate() function: Coldfire and AR7.
> >
> > This series contains three patches:
> >   - The first two patches add dummies for clk_set_rate(),
> >     clk_set_rate(), clk_set_parent(), and clk_get_parent() to the
> >     Coldfire and AR7, like Arnd has done for other legacy clock
> >     implementations a while ago.
> >   - The second patch removes the COMMON_CLK dependency from the stmmac
> >     network drivers again, as it is no longer needed.
> >     Obviously this patch has a hard dependency on the first two patches.
>
> Yes, good idea.
>
> Acked-by: Arnd Bergmann <arnd@...d.de>

Thanks!

> One question: what happens on machines that don't support any CLK
> interface, i.e.
> that don't have any of COMMON_CLK/HAVE_CLK/CLKDEV_LOOKUP?
>
> I guess those are already hopelessly broken for many drivers, right?

Nope, they (e.g. m68k allmodconfig) build fine, as they don't define
CONFIG_HAVE_CLK.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds