[U-Boot] [PATCH] exynos: Adjust the starting MIF voltage to 1.05v

[Simon Glass]

On Mon, Apr 15, 2013 at 11:34 AM, Bernie Thompson
<bhthompson at chromium.org> wrote:
> Some Exynos5250 silicon may require 1.05v on the MIF to be stable, so to be
> safe we can default to 1.05v instead of 1.00v. This can be set optimally later
> in the boot process by the kernel.
>
> The 0x6 value for 1.05v comes from the MAX77686 datasheet.
>
> Signed-off-by: Bernie Thompson <bhthompson at chromium.org>

Acked-by: Simon Glass <sjg at chromium.org>

> ---
>  board/samsung/smdk5250/smdk5250.c | 2 +-
>  include/power/max77686_pmic.h     | 2 ++
>  2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/board/samsung/smdk5250/smdk5250.c b/board/samsung/smdk5250/smdk5250.c
> index 217c6df..2cea844 100644
> --- a/board/samsung/smdk5250/smdk5250.c
> +++ b/board/samsung/smdk5250/smdk5250.c
> @@ -182,7 +182,7 @@ int power_init_board(void)
>
>         /* VDD_MIF */
>         if (pmic_reg_write(p, MAX77686_REG_PMIC_BUCK1OUT,
> -                                               MAX77686_BUCK1OUT_1V)) {
> +                                               MAX77686_BUCK1OUT_1_05V)) {
>                 debug("%s: PMIC %d register write failed\n", __func__,
>                                                 MAX77686_REG_PMIC_BUCK1OUT);
>                 return -1;
> diff --git a/include/power/max77686_pmic.h b/include/power/max77686_pmic.h
> index fdc7ca9..1c374a9 100644
> --- a/include/power/max77686_pmic.h
> +++ b/include/power/max77686_pmic.h
> @@ -157,6 +157,8 @@ enum {
>
>  /* Buck1 1 volt value */
>  #define MAX77686_BUCK1OUT_1V   0x5
> +/* Buck1 1.05 volt value */
> +#define MAX77686_BUCK1OUT_1_05V    0x6
>  #define MAX77686_BUCK1CTRL_EN  (3 << 0)
>  /* Buck2 1.3 volt value */
>  #define MAX77686_BUCK2DVS1_1_3V        0x38
> --
> 1.8.1.3
>
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