topic 回复： i.MX91 GPIO in i.MX Processors

i.MX91 GPIO

Embedded-world — Sat, 04 Jan 2025 07:07:32 GMT

Dear Experts,

I referred to the i.MX 91 Applications Processor Reference Manual, Rev. 2, dated 2024-11-07. Could you please provide clarity regarding the GPIO mux functionality for I2C2_SDA & I2C2_SCL?

I2C2_SDA:

I2C2_SCL:

As of now mentioned same GPIO mux in the manual.

Thanks & Regards
Ravikumar

回复： i.MX91 GPIO

Nobita — Mon, 06 Jan 2025 01:29:07 GMT

There should be many example shows you how to configure a pin function in dts file, for example:

https://github.com/nxp-imx/linux-imx/blob/569b33a1d0192fd51144ea6a79345b658aaec329/arch/arm64/boot/dts/freescale/imx91p-11x11-evk.dts#L674

MX93_PAD_CCM_CLKO2__GPIO3_IO27 0x31e

the definition of MX93_PAD_CCM_CLKO2__GPIO3_IO27 is #define MX93_PAD_CCM_CLKO2__GPIO3_IO27 0x008C 0x023C 0x0000 0x5 0x0

from the comment in arch/arm64/boot/dts/freescale/imx93-pinfunc.h we can see: The pin function ID is a tuple of
*<mux_reg conf_reg input_reg mux_mode input_val>
that is to say when you want to configure a pin's function you can just choose the predefintion in this file, the second part 0x31e in dts means minor tuning config for a special pin.
you can also refers to the pinctrl driver in drivers/pinctrl/freescale/pinctrl-imx93.c to see more details.

Re: i.MX91 GPIO

pengyong_zhang — Tue, 07 Jan 2025 02:33:52 GMT

Hi @Embedded-world

You can get the IOMUX function from below link:

https://github.com/nxp-imx/linux-imx/blob/lf-6.6.y/arch/arm64/boot/dts/freescale/imx91-pinfunc.h

Each integers description as following:

- description: |

"mux_reg" indicates the offset of mux register.

- description: |

"conf_reg" indicates the offset of pad configuration register.

- description: |

"input_reg" indicates the offset of select input register.

- description: |

"mux_val" indicates the mux value to be applied.

- description: |

"input_val" indicates the select input value to be applied.

B.R