I am currently adapting our product (which uses a Jetson Nano) to a new carrier board. We are not using an external sdcard, instead it needs one of the SDMMC3 DATx/CMD/CLK (any of 219, 221, 223, 225, 227, 229) pins to acts as a 3V3 GPIO to control a relay.
The custom carrier board uses the default dts files, only the sdhci@700b0400 is disabled, because we are not using the sdcard.
Using the pinmux spreadsheet I have set the SDMMC3 pins to “rsvd1” for GPIO. But setting 3V3 for the SDMMC3 IO Block Voltage has absolutely no effect on the dts output files.
Could somebody tell me how to enable 3V3 GPIO for these pins?