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exynos: Adjust the starting MIF voltage to 1.05v

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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@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Bernie Thompson 2013-04-15 10:34:34 -07:00 committed by Minkyu Kang
parent 2c07bb9b53
commit 2955d60015
2 changed files with 3 additions and 1 deletions
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2
board/samsung/smdk5250/smdk5250.c
View file

@ -144,7 +144,7 @@ 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;

2
include/power/max77686_pmic.h
View file

@ -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