RE: nRF54L15 I2C and GPIO sharing pin control

bvyates — Fri, 13 Mar 2026 22:35:57 GMT

Hi Vidar,

Thank you for your response, we were able to get that working!

I had a bit of confusion as to which device struct we needed to be referring as the i2c_dev with these pm_device function calls. I found that it was working when providing the pointer to the I2C bus node itself, and not the nodes for the clients on the bus (ex the EEPROM or sensor chips we're talking to). But with that straightened out, this seems to be working as expected.

Thanks again

RE: nRF54L15 I2C and GPIO sharing pin control

Vidar Berg — Wed, 11 Mar 2026 09:23:48 GMT

Hello Ben,

To be able to control the pins as regular GPIOs you must disable the TWIM peripheral first (TWIM pin configuration) like we are doing in the bus recover function here: https://github.com/nrfconnect/sdk-zephyr/blob/0218b36b4a3f5ef0f641d33006c9a9ed77471b99/drivers/i2c/i2c_nrfx_twim_common.c#L17. This can be done from the application by enabling CONFIG_PM_DEVICE and trigger the suspend/resume task before and after any TWIM transaction.

#include <zephyr/pm/device.h>

...
pm_device_action_run(i2c_dev, PM_DEVICE_ACTION_SUSPEND);
...
pm_device_action_run(i2c_dev, PM_DEVICE_ACTION_RESUME);

PM handling code for TWIM driver: https://github.com/nrfconnect/sdk-zephyr/blob/0218b36b4a3f5ef0f641d33006c9a9ed77471b99/drivers/i2c/i2c_nrfx_twim_common.c#L105

Best regards,

Vidar