GPIO config ignored, depending on order

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin NX
,
1

Hi, we’re using Orin NX with BSP 36.4, we have this pinmux in our device tree overlay, it’s important to be able to use the pin soc_gpio29_pq2 as output.

However, with this dtsi, the GPIO PQ.02 is ignored - cannot be controlled as output. Always stays low.

#include <dt-bindings/pinctrl/pinctrl-tegra.h>

/ {
	overlay-name = "Device pinmux";
	compatible = JETSON_COMPATIBLE;

	fragment@0 {
		target = <&pinmux>;
		__overlay__ {
			pinctrl-names = "default";
			pinctrl-0 = <&jetson_io_pinmux>;

			jetson_io_pinmux: device-evt-pinmux {
				// audio config: i2s pins
				soc_gpio41_ph7 {
					nvidia,pins = "soc_gpio41_ph7";
					nvidia,function = "i2s2";
					nvidia,pin-label = "i2s2_sclk";
					nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
					nvidia,tristate = <TEGRA_PIN_DISABLE>;
					nvidia,enable-input = <TEGRA_PIN_ENABLE>;
				};

				soc_gpio42_pi0 {
					nvidia,pins = "soc_gpio42_pi0";
					nvidia,function = "i2s2";
					nvidia,pin-label = "i2s2_dout";
					nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
					nvidia,tristate = <TEGRA_PIN_DISABLE>;
					nvidia,enable-input = <TEGRA_PIN_DISABLE>;
				};

				soc_gpio43_pi1 {
					nvidia,pins = "soc_gpio43_pi1";
					nvidia,function = "i2s2";
					nvidia,pin-label = "i2s2_din";
					nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
					nvidia,tristate = <TEGRA_PIN_ENABLE>;
					nvidia,enable-input = <TEGRA_PIN_ENABLE>;
				};

				soc_gpio44_pi2 {
					nvidia,pins = "soc_gpio44_pi2";
					nvidia,function = "i2s2";
					nvidia,pin-label = "i2s2_fs";
					nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
					nvidia,tristate = <TEGRA_PIN_DISABLE>;
					nvidia,enable-input = <TEGRA_PIN_ENABLE>;
				};

                                // i2c mux gpio MUX0 needs to be configured as GPIO with pull-up
				soc_gpio29_pq2 {
					nvidia,pins = "soc_gpio29_pq2";
					// function is "gpio" but including it here lead to an error message from driver
					// nvidia,function = "gpio";
					nvidia,pin-label = "soc_gpio29_pq2";
					nvidia,pull = <TEGRA_PIN_PULL_UP>;
					nvidia,tristate = <TEGRA_PIN_DISABLE>;
					nvidia,enable-input = <TEGRA_PIN_DISABLE>;
				};

			};
		};
	};
};

With this dtsi, it works. PQ.02 can be controlled and set high or low. The only change - different order. Why does it matter?

#include <dt-bindings/pinctrl/pinctrl-tegra.h>

/ {
	overlay-name = "Device pinmux";
	compatible = JETSON_COMPATIBLE;

	fragment@0 {
		target = <&pinmux>;
		__overlay__ {
			pinctrl-names = "default";
			pinctrl-0 = <&jetson_io_pinmux>;

			jetson_io_pinmux: device-evt-pinmux {
				// i2c mux gpio MUX0 needs to be configured as GPIO with pull-up
				soc_gpio29_pq2 {
					nvidia,pins = "soc_gpio29_pq2";
					// function is "gpio" but including it here lead to an error message from driver
					// nvidia,function = "gpio";
					nvidia,pin-label = "soc_gpio29_pq2";
					nvidia,pull = <TEGRA_PIN_PULL_UP>;
					nvidia,tristate = <TEGRA_PIN_DISABLE>;
					nvidia,enable-input = <TEGRA_PIN_DISABLE>;
				};

				// audio config: i2s pins
				soc_gpio41_ph7 {
					nvidia,pins = "soc_gpio41_ph7";
					nvidia,function = "i2s2";
					nvidia,pin-label = "i2s2_sclk";
					nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
					nvidia,tristate = <TEGRA_PIN_DISABLE>;
					nvidia,enable-input = <TEGRA_PIN_ENABLE>;
				};

				soc_gpio42_pi0 {
					nvidia,pins = "soc_gpio42_pi0";
					nvidia,function = "i2s2";
					nvidia,pin-label = "i2s2_dout";
					nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
					nvidia,tristate = <TEGRA_PIN_DISABLE>;
					nvidia,enable-input = <TEGRA_PIN_DISABLE>;
				};

				soc_gpio43_pi1 {
					nvidia,pins = "soc_gpio43_pi1";
					nvidia,function = "i2s2";
					nvidia,pin-label = "i2s2_din";
					nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
					nvidia,tristate = <TEGRA_PIN_ENABLE>;
					nvidia,enable-input = <TEGRA_PIN_ENABLE>;
				};

				soc_gpio44_pi2 {
					nvidia,pins = "soc_gpio44_pi2";
					nvidia,function = "i2s2";
					nvidia,pin-label = "i2s2_fs";
					nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
					nvidia,tristate = <TEGRA_PIN_DISABLE>;
					nvidia,enable-input = <TEGRA_PIN_ENABLE>;
				};
			};
		};
	};
};
3

Hi filip.kubicz,

Are you using the devkit or custom board for Orin NX?

We would suggest using pinmux spreadsheet to configure the pinmux.
The pinmux dtsi would be loaded in early boot(MB1).

pinctrl-tegra driver in kernel would also re-configure the pinmux during boot.
If you want to use the pin as GPIO/Output, we would also suggest applying the patch from 40hdr - SPI1 gpio padctl register bit[10] effect by gpiod tools in JP6 - #20 by KevinFFF

4

Thanks @KevinFFF . Are there any other official patches? Where can we find a list of the patches that should be applied?

5

For r36.4.x, you can refer to Jetson/L4T/r36.4.x patches - eLinux.org

7

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.