FRDM93 IMX9352 P11(GPIO_IO00 to GPIO_IO29) under linux control How can I keep off under linux?

[Gutenberg-coder]

Hi, I'm using FRDM93 , I want to free pin of P11 (GPIO_IO00 to GPIO_IO29) from linux to use them with core M33 and to initializate them by my C code. I'm using the file imx93-11x11-frdm.dtb and image LF_v6.6.36-2.1.0_images_FRDM_4.0_IMX9. I tried with file dtbo, but without success.How can I do ?

[danielchen]

Hi @Gutenberg-coder 

You can let the M33 own the P11 header pins (GPIO_IO00...GPIO_IO29) , you need to

1. stop Linux from touching those pads (disable any Linux drivers/pinctl groups that use them)

2. Make sure M33 has permission to the IOMUXC/GPIO blocks (TRDC settings)

3 Mux and initialize from M33 C code.

Regards

Daniel