topic Pin muxing in i.MX Processors

Pin muxing

Rabiraj — Thu, 21 Mar 2024 23:42:17 GMT

Hi,
I am using I.MX8M plus based SOC.
In that I wan to use a particular pin for GPIO purpose.
From I.MX8M plus application note document from NXP website, I am able to see in chapter 8, section 8.1 External signals and pin multiplexing .
Page number 1295 , in that port names : HDMI_HPD and HDMI_HPD_O
Are the two pins I am trying to reuse.
How can I find, these pins are connected which GPIO number?
Because I wan to edit my DTS file,
Can you please help me on this ?

Re: Pin muxing

Zhiming_Liu — Mon, 25 Mar 2024 02:40:28 GMT

Hi @Rabiraj

You can search in arch/arm64/boot/dts/freescale/imx8mp-pinfunc.h

For example, you can reuse HDMI_HPD pad as GPIO3_IO29

#define MX8MP_IOMUXC_HDMI_HPD__HDMIMIX_HDMI_HPD 0x24C 0x4AC 0x000 0x0 0x0 #define MX8MP_IOMUXC_HDMI_HPD__AUDIOMIX_HDMI_HPD_O 0x24C 0x4AC 0x000 0x1 0x0 #define MX8MP_IOMUXC_HDMI_HPD__I2C6_SDA 0x24C 0x4AC 0x5D0 0x3 0x3 #define MX8MP_IOMUXC_HDMI_HPD__CAN2_RX 0x24C 0x4AC 0x550 0x4 0x3 #define MX8MP_IOMUXC_HDMI_HPD__GPIO3_IO29 0x24C 0x4AC 0x000 0x5 0x0