From patchwork Fri Oct 5 08:16:35 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [U-Boot, v2, 13/21] pmic:max8997: Function for calculating LDO internal register value Date: Thu, 04 Oct 2012 22:16:35 -0000 From: =?utf-8?q?=C5=81ukasz_Majewski?= X-Patchwork-Id: 189439 Message-Id: <1349425003-32523-14-git-send-email-l.majewski@samsung.com> To: u-boot@lists.denx.de Cc: Tom Rini , Kyungmin Park Function for calculating LDO internal register value from passed micro Volt. Signed-off-by: Lukasz Majewski Signed-off-by: Kyungmin Park Cc: Stefano Babic --- Changes for v2: - MAX8997_LDO_MAX_VAL defined --- drivers/power/max8997/pmic_max8997.c | 16 ++++++++++++++++ include/power/max8997_pmic.h | 2 ++ 2 files changed, 18 insertions(+), 0 deletions(-) diff --git a/drivers/power/max8997/pmic_max8997.c b/drivers/power/max8997/pmic_max8997.c index 4e8283a..47ef7f6 100644 --- a/drivers/power/max8997/pmic_max8997.c +++ b/drivers/power/max8997/pmic_max8997.c @@ -26,6 +26,22 @@ #include #include +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_ */