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>
diff --git a/board/samsung/universal_c210/universal.c b/board/samsung/universal_c210/universal.c
index d0ff834..90fff5c 100644
--- a/board/samsung/universal_c210/universal.c
+++ b/board/samsung/universal_c210/universal.c
@@ -58,13 +58,13 @@
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 @@
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 @@
debug("mode0: %d, mode1: %d, hwrev 0x%x\n", mode0, mode1, hwrev);
+ adc_power_control(0);
+
return hwrev;
}