IMX8 PMIC

[gravity_one]

hello,

use imx8 ,

How does ‘app’ communicate with SCFW-PMIC，

I want to use ‘app’ to control the PMIC output，

thanks

[igorpadykov]

Hi WANG

one can try pmic apis described in sect.12.20.3.1 dynamic_pmic_set_voltage()
System Controller Firmware Porting Guide (sc_fw_port.pdf) included in
SCFW Porting Kit

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[gravity_one]

hello，

you provide : This approach is to develop power management in the SCFW phase,

I want to :Now that the kernel has started up and how to management power mode,

BRS

Grayli

[igorpadykov]

please check power management chapter in Linux Manual

in Linux 4.19.35_1.1.0 Documentation

Best regards
igor

[gravity_one]

hello，

I still don't see what I need，

please mark Which document which page?

i want to：Control or change the output of the LDOn on PMIC  after the kernel startup is complete，Change the output voltage；

i only see  CMD：echo enabled > /sys/class/tty/ttymxc0/power/wakeup ；

It doesn't meet my requirements；

thanks

BRS

Grayli

[igorpadykov]

please refer to regulator_set_voltage() api function on p.66 attached

Linux Manual.

Best regards
igor

[gravity_one]

hello,

use regulator_set_voltage() api function ,

The kernel's API needs to use system_call() to support APP operations,rigth?

thanks

BRS

Grayli

[evanlin]

hi Grayli,

did you figure out how to call these api functions in kernel?

[gravity_one]

hello，

download SCFW Porting Kit,is imx-scfw-porting-kit-1.2.7.1.tar.gz

tar zxvf  imx-scfw-porting-kit-1.2.7.1.tar.gz,

but no sc_fw_port.pdf.