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

From: Geert Uytterhoeven
Date: Mon Jun 11 2018 - 05:10:03 EST

Hi Arnd,

On Mon, Jun 11, 2018 at 11:02 AM Arnd Bergmann <arnd@xxxxxxxx> wrote:
> On Mon, Jun 11, 2018 at 10:44 AM, Geert Uytterhoeven
> <geert@xxxxxxxxxxxxxx> 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@xxxxxxx>


> 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



Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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