MTK Android driver:pmic

1. Basic Concepts

Pmic:power Management IC Power Management ICS

Related Interface Code :

U32 Pmic_config_interface (U32 RegNum, U32 val, U32 MASK, U32 SHIFT)

P reload:alps\mediatek\platform\mt6582\preloader\src\drivers\pmic_6323.c

Lk:alps\mediatek\platform\mt6582\lk\mt_pmic.c

Kernel:alps\mediatek\platform\mt6582\kernel\drivers\power\pmic_mt6323.c

Ldo: is the low dropout regulator, which means the voltage difference linear regulator, Ldo class power conversion chip.

Related interface Definitions:

power-up interface function: Hwpoweronpower-down interface function :hwpowerdown

Alps\mediatek\platform\mt6582\kernel\core\mt_pm_ldo.c

2. Power-on, power-down configuration method (preload, lk, kernel, Four stages after system start ):

2.1 preload, LK Stage configuration: here is the power-up/power-down method in the LK phase:use the API inside the UPMU_COMMON.C file to control each LDO_VGPX separately.For example:Upmu_set_rg_vgp6_vosel used to control the voltage value of power-up;The upmu_set_rg_vgp6_en is used to control the Enable VGP6 pin

2.2 Kernel phase configuration:

power-up interface function: Hwpoweronpower-down interface function :hwpowerdownThe following is an example of the VGP6 of PMIC6320. please call Hwpoweron when you want to power on the file # include <mach/mt_pm_ldo.h> power up please call HwpowerdownHwpoweron (MT65XX_POWER_LDO_VGP6, vol_2800, "ldo_test");bool Hwpowerdown (MT65XX_POWER_LDO_VGP6, "ldo_test");

2.3 System boot post-stage configuration:

After the normal start of the system, kernel are running up, so the power on/off the operation should be placed in the kernel inside.

3 Drive Voltage modification:

LCM vgp1 Drive Voltage:

\alps\mediatek\custom\common\kernel\lcm\rgb_mt8193\rgb_mt8193.c

static void Lcm_init (void) {

Upmu_set_rg_vgp1_vosel (0x7);// Drive voltage Modification--->pmic_config_interface ()

Upmu_set_rg_vgp1_en (0x1);

}

mt6323 voltage level corresponding file:

\alps\mediatek\platform\mt6582\kernel\drivers\power\pmic_mt6323.c

Example: VGP1 voltage level mapping table:

void Dct_pmic_vgp1_sel (Kal_uint32 Volt)

{

if (Volt = = Vol_default) {Upmu_set_rg_vgp1_vosel (5);}

else if (volt = = vol_1200) {upmu_set_rg_vgp1_vosel (0);}

else if (volt = = vol_1300) {Upmu_set_rg_vgp1_vosel (1);}

else if (volt = = vol_1500) {Upmu_set_rg_vgp1_vosel (2);}

else if (volt = = vol_1800) {Upmu_set_rg_vgp1_vosel (3);}

else if (volt = = vol_2000) {Upmu_set_rg_vgp1_vosel (4);}

else if (volt = = vol_2800) {Upmu_set_rg_vgp1_vosel (5);}

else if (volt = = vol_3000) {Upmu_set_rg_vgp1_vosel (6);}

else if (volt = = vol_3300) {Upmu_set_rg_vgp1_vosel (7);}

else{

}

}

MTK Android driver:pmic