Using Linux Yocto custom build based to Toradex Yocto reference project (BSP 5.2.0) and custom carrier board. I’m using suspend to RAM state and SOM pin 256 CTRL_SLEEP_MOCI# to enter into low power state. SOM switches into sleep state and display is switched off:
[ 43.508340] PM: suspend entry (deep)
[ 43.517982] Filesystems sync: 0.006 seconds
[ 43.523279] Freezing user space processes … (elapsed 0.001 seconds) done.
[ 43.531796] OOM killer disabled.
[ 43.535021] Freezing remaining freezable tasks … (elapsed 0.104 seconds) done.
[ 43.647045] printk: Suspending console(s) (use no_console_suspend to debug)
Anyhow the pin 256 CTRL_SLEEP_MOCI# remains in 1.8 V, I expect it should go down.
What could be reason for this and how to configure device to follow datasheet ?
256 CTRL_SLEEP_MOCI# O OD 1.8V
“Enable signal for the power rails on the carrier board
peripherals which need to be turned off during sleep mode. It is
only high during running mode. The signal is an open-drain type
with on-module 10k pull-up resistors. The signal is defined
during the power up sequence. Can be left floating on carrier