[U-Boot] [PATCH v4 13/24] pmic:max8997: Function for calculating LDO internal register value

Lukasz Majewski
2012-10-30T16:57:08Z

Function for calculating LDO internal register value from passed micro
Volt.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Stefano Babic <sbabic@denx.de>
---
Changes for v2:
- MAX8997_LDO_MAX_VAL defined
Changes for v3:
- None
Changes for v4:
- None
---
drivers/power/pmic/pmic_max8997.c | 16 ++++++++++++++++
include/power/max8997_pmic.h | 2 ++
2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/power/pmic/pmic_max8997.c b/drivers/power/pmic/pmic_max8997.c
index 4e8283a..47ef7f6 100644
--- a/drivers/power/pmic/pmic_max8997.c
+++ b/drivers/power/pmic/pmic_max8997.c
@@ -26,6 +26,22 @@
#include <power/max8997_pmic.h>
#include <i2c.h>

+unsigned char max8997_reg_ldo(int uV)
+{
+ unsigned char ret;
+ if (uV <= 800000)
+ return 0;
+ if (uV >= 3950000)
+ return MAX8997_LDO_MAX_VAL;
+ ret = (uV - 800000) / 50000;
+ if (ret > MAX8997_LDO_MAX_VAL) {
+ printf("MAX8997 LDO SETTING ERROR (%duV) -> %u\n", uV, ret);
+ ret = MAX8997_LDO_MAX_VAL;
+ }
+
+ return ret;
+}
+
int pmic_init(unsigned char bus)
{
struct pmic *p = pmic_alloc();
diff --git a/include/power/max8997_pmic.h b/include/power/max8997_pmic.h
index 1db7deb..03cac04 100644
--- a/include/power/max8997_pmic.h
+++ b/include/power/max8997_pmic.h
@@ -200,4 +200,6 @@ enum {
EN_LDO = (0x3 << 6),
};

+#define MAX8997_LDO_MAX_VAL 0x3F
+unsigned char max8997_reg_ldo(int uV);
#endif /* __MAX8997_PMIC_H_ */
--
1.7.2.3