How to change the PF0100 voltage on i.MX6SABRE by I2C

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How to change the PF0100 voltage on i.MX6SABRE by I2C

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yuuki
Senior Contributor II

Dear all,

We run YOCTO Linux on MX6DL_SABRE-SDP board.

BSP: fsl-yocto-3.10.17_1.0.0

We want to change the output voltage of PMIC.
We understand the voltage of PMIC can be changed through I2C.

However, we cannot find a sample cord.
Would you teach a source code name and the place we have to refer to?

Best Reagrds,
Yuuki

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This an automatic process.

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HaohuaQIN
Contributor III

/sys/devices/platform/imx-i2c.1/i2c-1/1-0008/pfuze100-regulator/regulator/

root@freescale /sys/devices/platform/imx-i2c.1/i2c-1/1-0008/pfuze100-regulator/regulator$ ls

regulator.10  regulator.13  regulator.16  regulator.19  regulator.22  regulator.9

regulator.11  regulator.14  regulator.17  regulator.20  regulator.23

regulator.12  regulator.15  regulator.18  regulator.21  regulator.24

root@freescale /sys/devices/platform/imx-i2c.1/i2c-1/1-0008/pfuze100-regulator/regulator/regulator.12$ ls

device                      suspend_disk_microvolts

max_microvolts              suspend_disk_state

microvolts                  suspend_mem_microvolts

min_microvolts              suspend_mem_state

name                        suspend_standby_microvolts

num_users                   suspend_standby_state

power                       type

state                       uevent

subsystem

root@freescale /sys/devices/platform/imx-i2c.1/i2c-1/1-0008/pfuze100-regulator/regulator/regulator.12$ cat microvolts

3300000

root@freescale /sys/devices/platform/imx-i2c.1/i2c-1/1-0008/pfuze100-regulator/regulator/regulator.12$ echo 2600000 > microvolts

root@freescale /sys/devices/platform/imx-i2c.1/i2c-1/1-0008/pfuze100-regulator/regulator/regulator.12$ cat microvolts

2600000

you can use see the voltage on the boar is changed.

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michaelguntli
Contributor IV

 HaohuaQIN‌ what did you modify in the kernel to get permissions to modify the regulator microvolts?

We are using i.MX Linux kernel 3.14.52:

root@h5:/sys/bus/i2c/devices/1-0008/regulator/regulator.12 # cat name
SW3A
root@h5:/sys/bus/i2c/devices/1-0008/regulator/regulator.12 # cat microvolts
1225000
echo 1200000 > microvolts
/system/bin/sh: can't create microvolts: Permission denied

I found the following defines:

CONFIG_REGULATOR_VIRTUAL_CONSUMER=y
CONFIG_REGULATOR_USERSPACE_CONSUMER=y

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igorpadykov
NXP Employee
NXP Employee

Hi Yuuki

voltage can be set with linux regulator apis (like regulator_set_voltage),

plese refer to sect.23.3.1 Regulator APIs, and PFUZE100 regulator driver

in sect.23.4.2 Source Code Structure attached Linux Manual.

Best regards

igor

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