MTK Android Driver: PMIC, mtkpmic

MTK Android Driver: PMIC, mtkpmic

1. Basic Concepts

PMIC: Power Management IC

Related interface code:

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

Preload: 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

Low dropout regulator is a low dropout regulator, which is a low-voltage differential linear voltage regulator and a power conversion chip in the drop-down mode.

Related interface definition:

Power-on interface function: hwPowerOn power-down interface function: hwPowerDown

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

2. Power-on and power-down configuration methods (four phases after preload, lk, kernel, and system startup ):

2.1 preload and lk phase configuration: The following is the power-on/power-down method in LK phase: Use the APIs in the upmu_common.c file to control each LDO_VGPX. for example, upmu_set_rg_vgp6_vosel is used to control the power-on voltage value, and upmu_set_rg_vgp6_en is used to control the pin of enable VGP6.

2.2 kernel phase Configuration:

Power-on interface function: hwPowerOn power-down interface function: hwPowerDown the following uses PMIC6320 VGP6 as an example. Please call hwPowerOn in the file # include <mach/mt_pm_ldo.h> You Want to power on. If power is down, call hwPowerDownhwPowerOn (power, VOL_2800, "ldo_test"); bool hwPowerDown (power, "ldo_test ");

2.3 After system startup:

After the system is started normally, the kernel runs. Therefore, all power-on/power-down operations should be placed in the kernel.

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); // driving voltage modification ---> pmic_config_interface ()

Upmu_set_rg_vgp1_en (0x1 );

}

Mt6323 voltage level file:

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

Example: vgp1 voltage level ing 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 {

}

}