[Jetson AGX Orin] How to Identify MMIO Address and Verify Pinmux for DP83867 Reset via GPIO

[KevinFFF]

@thpark19

sudo busybox devmem 0x02434078
I get:
0x00000008

It indicates RSVD0, PULL_UP, PASSTHROUGH, DISABLE INPUT, GPIO.

@thpark19

soc_gpio18_pg5 {
nvidia,pins = “soc_gpio18_pg5”;
nvidia,function = “rsvd0”;
nvidia,pull = <TEGRA_PIN_PULL_UP>;
nvidia,tristate = <TEGRA_PIN_DISABLE>;
nvidia,enable-input = <TEGRA_PIN_DISABLE>;
nvidia,lpdr = <TEGRA_PIN_DISABLE>;
};

It matches your configurations.

@thpark19

I expected this pin to be configured as GPIO output with pull-up,

You have to configure Output/Drive 1 in pinmux spreadsheet as following.

Please also check tegra234-mb1-bct-gpio-p3701-0000-a04.dtsi for GPIO related configurations.

@thpark19

According to the PADCTL register format, the expected value for my current configuration is 0x00000002.

No, [1:0] as 00 means RSVD0 while [3:2] as 10 means pull-up.

@thpark19

Could you also provide the MMIO address to read or write the GPIO output value for GPIO 388?

Do you want to perform DRA to control GPIO for PG.05?