[U-Boot] [PATCH 25/37] arm: rmobile: Add support TMU base timer function

[Nobuhiro Iwamatsu]

Hi,

On Tue, Aug 21, 2012 at 9:18 AM, Kim Phillips
<kim.phillips at freescale.com> wrote:
> On Mon, 20 Aug 2012 00:21:10 +0900
> Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj at renesas.com> wrote:
>
>> On Tue, Aug 14, 2012 at 8:26 AM, Kim Phillips
>> <kim.phillips at freescale.com> wrote:
>> > On Fri, 10 Aug 2012 16:16:12 +0900
>> > Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj at renesas.com> wrote:
>> >
>> >> Some rmobile SoC has TMU base timer function. This supports TMU.
>> >>
>> >> Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj at renesas.com>
>> >> ---
>> >>  V2: Set COBJS one object per line, and sort the list.
>> >>
>> >>  arch/arm/cpu/armv7/rmobile/Makefile           |    4 +-
>> >>  arch/arm/cpu/armv7/rmobile/timer_tmu.c        |  161 +++++++++++++++++++++++++
>> >
>> > this is a copy of arch/sh/lib/time.c but with proper struct tmu_regs
>> > instead of #defines; is it not possible to refactor & merge the two?
>>
>> I am going to merge next work.
>
> not sure what this means, but usually u-boot development favours
> initially refactoring common code rather than duplicating it, and
> then refactoring it (although I wouldn't know where common timer code
> across arches could live).

OK, I will work about this.
maybe, I think that timer common code of SH was moved to drivers/timer.

>
>> >> +int timer_init(void)
>> >> +{
>> >> +     /* Divide clock by CONFIG_SYS_TMU_CLK_DIV */
>> >> +     u16 bit = 0;
>> >> +
>> >> +     switch (CONFIG_SYS_TMU_CLK_DIV) {
>> >> +     case 1024:
>> >> +             bit = 4;
>> >> +             break;
>> >> +     case 256:
>> >> +             bit = 3;
>> >> +             break;
>> >> +     case 64:
>> >> +             bit = 2;
>> >> +             break;
>> >> +     case 16:
>> >> +             bit = 1;
>> >> +             break;
>> >> +     case 4:
>> >> +     default:
>> >> +             break;
>> >> +     }
>> >
>> > Can this be broken down into a shift operation?
>>
>> Sorry, I can not understand this.
>> This means not using swtich but using shift operation?
>
> Sorry, I meant this: (ffs(CONFIG_SYS_TMU_CLK_DIV) >> 1) - 1
>

I see. Thanks for your point. I forgot ffs().

Best regards,
  Nobuhiro
-- 
Nobuhiro Iwamatsu