In the process of transitioning from a Bitbake made 4.9 image to the Linaro Debian 18.01 release on a DB410c.
We’ve hit a bit of a wall where we are unable to control:
We can export the pins in /sys/class/gpio but when inspecting the output with a logic analyzer, we’re not getting any action on the pins.
Any suggestions? (Thanks in advance!)
We’ve hit a bit of a wall where we are unable to control:
- GPIO2
- GPIO3
- GPIO114
Have you disabled the drivers that normally use these pins?
No sir, was unaware of any drivers which may be using these pins. Running the stock Debian from Linaro.
Can you please tell me which driver is using these pins or how I might find it for myself?
Is this accurate for finding which drivers may be blocking access?
yes, but you can check the device tree as well, in the kernel source tree:
git grep gpio -- arch/arm64/boot/dts/qcom/msm8916-pins.dts
you will deduce that gpio2 and gpio3 are use for UART1 (or SPI), and gpio114 for audio I2S.
thank you so much!
You’re always so helpful!
