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authorƁukasz Majewski <l.majewski@samsung.com>2012-03-26 21:53:48 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-05-15 08:31:28 +0200
commit4d86bf086009a4edfe747341e7cb83bf46e6f022 (patch)
treee6603162c4b74cded5fbf8886f51a1e75c454b4e /board/samsung/universal_c210
parent90005092fc91fa1ae41558db5134da41dc706745 (diff)
downloadu-boot-4d86bf086009a4edfe747341e7cb83bf46e6f022.tar.gz
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>
Diffstat (limited to 'board/samsung/universal_c210')
-rw-r--r--board/samsung/universal_c210/universal.c25
1 files changed, 22 insertions, 3 deletions
diff --git a/board/samsung/universal_c210/universal.c b/board/samsung/universal_c210/universal.c
index d0ff8341f6..90fff5cf5e 100644
--- a/board/samsung/universal_c210/universal.c
+++ b/board/samsung/universal_c210/universal.c
@@ -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;
}