[U-Boot] [RESEND PATCH] ARM: Exynos4: ADC: Universal_C210: Enable LDO4 power line for ADC measurement

[Lukasz Majewski]

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.majew...@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
Cc: Minkyu Kang <mk7.k...@samsung.com>
---
 board/samsung/universal_c210/universal.c |   25 ++++++++++++++++++++++---
 include/max8998_pmic.h                   |    1 +
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/board/samsung/universal_c210/universal.c 
b/board/samsung/universal_c210/universal.c
index 334a346..70f03e9 100644
--- a/board/samsung/universal_c210/universal.c
+++ b/board/samsung/universal_c210/universal.c
@@ -59,13 +59,13 @@ 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;
 }
 
@@ -110,10 +110,27 @@ 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 */
 
@@ -136,6 +153,8 @@ 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 10c892a..ca21f88 100644
--- 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)
 
-- 
1.7.2.3

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