linux-kernel - Re: [PATCH RESEND 05/12] sh: DeviceTree support update

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Date:	Tue, 10 May 2016 17:27:21 +0900
From:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Rich Felker <dalias@...c.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND 05/12] sh: DeviceTree support update

On Wed, 04 May 2016 15:41:18 +0900,
Geert Uytterhoeven wrote:
> 
> On Wed, May 4, 2016 at 5:10 AM, Rich Felker <dalias@...c.org> wrote:
> >On Sun, May 01, 2016 at 02:08:29PM +0900, Yoshinori Sato wrote:
> >>  static void __init sh_of_setup(char **cmdline_p)
> >>  {
> >> -     unflatten_device_tree();
> >> -
> >> -     board_time_init = sh_of_time_init;
> >> +     struct device_node *cpu;
> >> +     int freq;
> 
> You better make freq unsigned.

OK.

> >>       sh_mv.mv_name = of_flat_dt_get_machine_name();
> >>       if (!sh_mv.mv_name)
> >>               sh_mv.mv_name = "Unknown SH model";
> >>
> >>       sh_of_smp_probe();
> >> +     cpu = of_find_node_by_name(NULL, "cpu");
> >> +     if (!of_property_read_u32(cpu, "clock-frequency", &freq))
> >> +             preset_lpj = freq / 500;
> >>  }
> >
> > I setup the DT-based pseudo-board to use the generic calibrate-delay
> > rather than hard-coding lpj. Ideally we could just get rid of bogomips
> > completely but there are probably still some things using it. Is there
> > a reason you prefer making up a value for lpj based on the cpu clock
> > rate?
> 
> Calibrating the delay loop takes some time.
> However, you shouldn't hardcode 500, but take HZ into account.
> I assume you used the default HZ=250, so

That's right.
I'll fix it.

>         preset_lpj = freq / HZ / 2;
> 
> 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

-- 
Yoshinori Sato
<ysato@...rs.sourceforge.jp>