Jetson tx2 gpio

endoruk123 · April 4, 2020, 1:42pm

My gpio file does not match Tx2 gpio pins. tx2 gpio pin number is different. how can i solve this.

Screenshot from 2020-04-04 16-38-51

richardsearle · April 4, 2020, 8:34pm

This might be helpful https://forums.developer.nvidia.com/t/gpio-doesnt-work/49203

WayneWWW · April 6, 2020, 3:52am

Hi,

There is a mapping between system gpio number and the pinout. Please refer to below file to understand the calculation.

github.com

torvalds/linux/blob/master/include/dt-bindings/gpio/tegra186-gpio.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * This header provides constants for binding nvidia,tegra186-gpio*.
 *
 * The first cell in Tegra's GPIO specifier is the GPIO ID. The macros below
 * provide names for this.
 *
 * The second cell contains standard flag values specified in gpio.h.
 */

#ifndef _DT_BINDINGS_GPIO_TEGRA186_GPIO_H
#define _DT_BINDINGS_GPIO_TEGRA186_GPIO_H

#include <dt-bindings/gpio/gpio.h>

/* GPIOs implemented by main GPIO controller */
#define TEGRA186_MAIN_GPIO_PORT_A 0
#define TEGRA186_MAIN_GPIO_PORT_B 1
#define TEGRA186_MAIN_GPIO_PORT_C 2
#define TEGRA186_MAIN_GPIO_PORT_D 3

This file has been truncated. show original

Also, there is a offset for each group GPIO. You could check it by reading the debug node.
root@nvidia-desktop:/sys/kernel/debug# cat gpio

gpiochip0: GPIOs 320-511, parent: platform/2200000.gpio, tegra-gpio:
gpiochip1: GPIOs 256-319, parent: platform/c2f0000.gpio, tegra-gpio-aon:

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Jetson tx2 gpio

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