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ARM: Exynos4: ADC: Universal_C210: Enable LDO4 power line for ADC measurement 

This patch enables LDO4 power line for preparing proper voltages to be
measured by ADC converter.
This measurement is used for determination of target board HW revision.

Test HW:
Universal_C210 (Exynos4210) rev. 0.0

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Łukasz Majewski 2012-03-26 21:53:48 +00:00 committed by Albert ARIBAUD
parent 90005092fc
commit 4d86bf0860
2 changed files with 23 additions and 3 deletions
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25
board/samsung/universal_c210/universal.c
View File

@ -58,13 +58,13 @@ int board_init(void)
gd->bd->bi_arch_number = MACH_TYPE_UNIVERSAL_C210;
gd->bd->bi_boot_params = PHYS_SDRAM_1 + 0x100;
check_hw_revision();
printf("HW Revision:\t0x%x\n", board_rev);
#if defined(CONFIG_PMIC)
pmic_init();
#endif
check_hw_revision();
printf("HW Revision:\t0x%x\n", board_rev);
return 0;
}
@ -109,10 +109,27 @@ static unsigned short get_adc_value(int channel)
return ret;
}
static int adc_power_control(int on)
{
int ret;
struct pmic *p = get_pmic();
if (pmic_probe(p))
return -1;
ret = pmic_set_output(p,
MAX8998_REG_ONOFF1,
MAX8998_LDO4, !!on);
return ret;
}
static unsigned int get_hw_revision(void)
{
int hwrev, mode0, mode1;
adc_power_control(1);
mode0 = get_adc_value(1); /* HWREV_MODE0 */
mode1 = get_adc_value(2); /* HWREV_MODE1 */
@ -135,6 +152,8 @@ static unsigned int get_hw_revision(void)
debug("mode0: %d, mode1: %d, hwrev 0x%x\n", mode0, mode1, hwrev);
adc_power_control(0);
return hwrev;
}

1
include/max8998_pmic.h
View File

@ -75,6 +75,7 @@ enum {
};
#define MAX8998_LDO3 (1 << 2)
#define MAX8998_LDO4 (1 << 1)
#define MAX8998_LDO8 (1 << 5)
#define MAX8998_SAFEOUT1 (1 << 4)