What is the default settings of LDO regulator in Nitrogen 6 Max dtbs ?

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What is the default settings of LDO regulator in Nitrogen 6 Max dtbs ?

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peteramond
Contributor V

Dear All,

GaryBisson

YuriMuhin_ng

igorpadykov

I used Nitrogen 6 Max development board for my custom hardware design. As well as I used Nitrogen 6 Max dtbs and uboot for that. But I changed its VDDSOC_IN and VDDARM_IN to 1.375 volts and I need to use them in LDO enable mode. But Notrogen 6 Max it is using LDO bypass voltages. As well as I couldn't see any dtb related to LDO enable mode.

 

1) What are the default settings of the LDO regulator in kernel (In Nitrogen 6 Max) ? Is that LDO enable or LDO bypass ? Do you know any method to see the present status of the LDO in kernel ? Using devrgs command ?

 

When I read PMU_REG_CORE register using devrgs tools will it give the present settings ?

devregs 0x020C8140

 

2) Can we set this LDO settings in uboot ?

 

3) And also some of my custom hardware designs are not working when it is 1.2V for VDDSOC_IN and when I run GPU is highly stressed application. But when I give 1.375V to VDDSOC_IN, I can stress GPU more. Can you comment on this ? Can't I stress the GPU when I'm using LDO bypass mode(1.2V) ?

 

4)If I'm using Nitrogen 6 Max dtbs how can I change LDO bypass to LDO enable mode ?

 

Regards,

Peter.

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igorpadykov
NXP Employee
NXP Employee

Hi Peter

in general for default settings of the LDO regulator first suggest to analyze

schematic of this board

https://boundarydevices.com/product/nitrogen6max/ 

some answers can be found in post Kulunu October 30, 2017 at 11:37 am

U-Boot v2017.03 - Boundary Devices 

ldo dts examples

ENGR00277895: dts: ARM: imx6: add ldo-enable dts files (5a87f28b) · Commits · ARM / qmx6_kernel · Gi... 

Best regards
igor
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