IMX8MM: PMIC issue

[haryanl]

Hi everybody
we are using BSP L4.19.35 but appears NVCC_SNVS_1V8 (PMIC LDO1) phenomenon changed from 1V8 -> 3V
Waveform:

+ When trying 3 BSP versions on IMX8MM EVK board, we have the following results
- BSP L4.14.78 → LDO1 unchanged
- BSP L4.19.35 → LDO1 Has been changed
-  BSP L5.4.24 → LDO1 unchanged

+ Check register set PMIC LDO1_ 0x18 corresponding to get the results
Command: i2cget -f -y 0 0x4b 0x18
- L4.14.78 -> result = 0x62 (1.8V)
- L4.19.35 -> result = 0x40 (3V)
- L5.4.24 -> result = 0x62 (1.8V)
* See the attached Log file and PMIC_LDO1_reg.png Image

Can you help me confirm this below
1. You can test on your EVK board  with BSP 4.19.35

https://www.nxp.com/webapp/Download?colCode=L4.19.35_1.0.0_MX8MM&appType=license 
-> Has the above phenomenon happened?
2. The Operating range of the CPU IMX8MM NVCC_SNVS_1P8 is 1.62V ~ 1.98V?
Does it matter when it becomes 3V?

3. Why is this phenomenon on the L4.19.35 version? Has PMIC driver been changed?

4. It seems that in bd71837-regulator.c file set LDO1 range is 3V ~ 3.3V?
is not 1.6V ~ 1.9V, is this the cause?

/*
* LDO1
* 3.0 to 3.3V (100mV step)
*/
static const struct regulator_linear_range bd71837_ldo1_voltage_ranges[] = {
REGULATOR_LINEAR_RANGE(3000000, 0x00, 0x03, 100000),
};

We appreciate your feedback

Thanks and Regards,

Huy

[igorpadykov · Accepted solution]

Hi Huy

 there are different patches for this issue, please appy the correct patch on the right release branch:

  1). imx_4.14.98_2.3.0:
     0001-MLK-23275-1-ARM64-dts-freescale-fsl-imx8mm-evk-corre.patch
     0002-MLK-23275-2-ARM64-dts-freescale-fsl-imx8mn-ddr4-evk-.patch
     0003-MLK-23275-3-regulator-bd71837-correct-ldo1-ldo2-grou.patch
  2). imx_4.19.35_1.1.0:
     0001-MLK-23275-1-ARM64-dts-freescale-fsl-imx8mm-evk-corre.patch
     0002-MLK-23275-2-ARM64-dts-freescale-fsl-imx8mn-ddr4-evk-.patch
     0003-MLK-23846-ARM64-dts-freescale-fsl-imx8mn-ddr4-evk-co.patch
  3). imx_5.4.3_2.0.0:
     0001-MLK-23275-1-ARM64-dts-freescale-fsl-imx8mm-evk-corre.patch
     0002-MLK-23275-2-ARM64-dts-freescale-imx8mn-ddr4-evk-corr.patch
     0003-MLK-23844-1-ARM64-dts-freescale-imx8mn-ddr4-evk-clea.patch
     0004-MLK-23844-2-ARM64-dts-freescale-imx8mm-correct-VDDAR.patch

make search on link  

https://source.codeaurora.org/external/imx/linux-imx/log/?h=imx_5.4.3_2.0.0&qt=grep&q=MLK-23275 

Best regards
igor
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[haryanl]

Thanks for your help
We will reconfirm it