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 d0ff8341f648f3496cc14927338d0349ec134634..90fff5cf5e181af64cfd56b53937d64daac916bd 100644 (file)
--- 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;
 }
 

diff --git a/include/max8998_pmic.h b/include/max8998_pmic.h
index 10c892a51df82d2d59fed3fc28b3abf992e5cf65..ca21f882c29344aae475cc967fc55255619ad3fe 100644 (file)
--- a/include/max8998_pmic.h
+++ b/include/max8998_pmic.h
@@ -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)