powerdetection for unused blocks

Autonomous Machines Jetson & Embedded Systems Jetson TK1
1

The kernel on my custom board gives the following powerdetect output:

[    0.660268] tegra: failed to map regulator to power detect cell pwrdet_pex_ctl(-517)
[    0.660329] tegra: failed to map regulator to power detect cell pwrdet_sdmmc3(-517)
[    0.660456] tegra: failed regulators mapping - io power detection is left always on

This makes sense, since we do not power on the PEX_CTL and SDMMC3 blocks in our design, but I’m not sure how to fix this. powerdetect.c looks for regulators supplying pwrdet_pex_ctl/pwrdet_sdmmc3, which I do not have, and the code is not board specific, but soc specific.

I see that I can turn off powerdetect, but I suspect that is not what I want…

2

Hello,
Please check the DTS part for these 2 power regulator consumer. They should be declared according to hardware design in DTS.

br
ChenJian

3

In our hardware design they are not connected/powered, and I do not know how to handle that in the DTS.

4

Hello,
I’m assuming that you are using TK1 21.3.
From that message, it seems that the 2 power regulator comsumer are missed in DTS. (Have you ever changed the code? I can see that in my code base.)
Please check the code @ arch/arm/mach-tegra/powerdetect.c, and corresponding DTS source code (For default Jetson TK1 board, it is arch/arm/boot/dts/tegra124-platforms/tegra124-jetson_tk1-pmic-pm375-0000-c00-00.dtsi. check the corresponding file if you’ve changed the board config.)

Hope that helps.

br
ChenJian

5

I’ve created DTS file for our own board. We do not power up those blocks, so I have no regulator supplies for them, and therefore I have no place to add consumers. At least no place where it is correct :)

6

Hello,
Those 2 items can be removed from pwr_detect_cells @ arch/arm/mach-tegra/powerdetect.c if they are unused. And then the error messages will be gone.

br
ChenJian