[U-Boot] [PATCH 1/2] Tegra2: Make XTal speed configurable

[Simon Glass]

Hi Marek,

On Wed, Oct 12, 2011 at 4:19 AM, Marek Vasut <marek.vasut at gmail.com> wrote:
> On Wednesday, October 12, 2011 02:30:57 AM Simon Glass wrote:
>> Hi Marek,
>>
>> On Wed, Oct 5, 2011 at 10:05 AM, Marek Vasut <marek.vasut at gmail.com> wrote:
>> > On Wednesday, October 05, 2011 04:10:56 PM Simon Glass wrote:
>> >> Hi Marek,
>> >>
>> >> On Fri, Sep 30, 2011 at 5:12 PM, Marek Vasut <marek.vasut at gmail.com> wrote:
>> >> > The Toradex T20 module uses 13MHz Xtal, so make the Xtal speed
>> >> > configurable.
>> >> >
>> >> > Signed-off-by: Marek Vasut <marek.vasut at gmail.com>
>> >> > Cc: Simon Glass <sjg at chromium.org>
>> >> > Cc: Ben Warren <biggerbadderben at gmail.com>
>> >> > Cc: Tom Warren <twarren.nvidia at gmail.com>
>> >> > Cc: Stephen Warren <swarren at nvidia.com>
>> >> > ---
>> >> >  arch/arm/cpu/armv7/tegra2/ap20.c |    9 +++++++--
>> >> >  1 files changed, 7 insertions(+), 2 deletions(-)
>> >> >
>> >> > diff --git a/arch/arm/cpu/armv7/tegra2/ap20.c
>> >> > b/arch/arm/cpu/armv7/tegra2/ap20.c index dc5f984..71d9f26 100644
>> >> > --- a/arch/arm/cpu/armv7/tegra2/ap20.c
>> >> > +++ b/arch/arm/cpu/armv7/tegra2/ap20.c
>> >> > @@ -31,6 +31,11 @@
>> >> >  #include <asm/arch/scu.h>
>> >> >  #include <common.h>
>> >> >
>> >> > +/* The default XTal is 12MHz, some boards might use 13MHz one though
>> >> > */ +#ifndef        CONFIG_SYS_TEGRA2_XTAL_MHZ
>> >> > +#define        CONFIG_SYS_TEGRA2_XTAL_MHZ      12
>> >> > +#endif
>> >> > +
>> >> >  u32 s_first_boot = 1;
>> >> >
>> >> >  void init_pllx(void)
>> >> > @@ -46,8 +51,8 @@ void init_pllx(void)
>> >> >        /* Set PLLX_MISC */
>> >> >        writel(1 << PLL_CPCON_SHIFT, &pll->pll_misc);
>> >> >
>> >> > -       /* Use 12MHz clock here */
>> >> > -       reg = PLL_BYPASS_MASK | (12 << PLL_DIVM_SHIFT);
>> >> > +       /* Use 13MHz clock here */
>> >>
>> >> Change comment?
>> >>
>> >> > +       reg = PLL_BYPASS_MASK | (CONFIG_SYS_TEGRA2_XTAL_MHZ <<
>> >> > PLL_DIVM_SHIFT); reg |= 1000 << PLL_DIVN_SHIFT;
>> >> >        writel(reg, &pll->pll_base);
>> >> >
>> >> > --
>> >> > 1.7.5.4
>> >>
>> >> Regards,
>> >> Simon
>> >
>> > Hi Simon, I'll probably also change the board.c to support this. But
>> > then, can't the board.c be moved to arch/arm/cpu/armv7/tegra... and it's
>> > functions exported via standard header ? Cheers
>>
>> Which board.c do you mean and which change do you need to make?
>
> Hi Simon,
>
> board/nvidia/common/board.c
>
> same as this patch does .
>

Well there are several files called board.c:

board/nvidia/common/board.c - Common things for Nvidia boards
arch/arm/lib/board.c - Generic ARM things
arch/arm/cpu/armv7/tegra2/board.c - Generic Tegra things

Since this is to do with Tegra, I think it should stay where it is in
ap20.c and you should just add a config. For now
arch/arm/cpu/armv7/tegra2/board.c just deals with DRAM.

Regards,
Simon