I have added
gpio-keys {
compatible = "gpio-keys";
gpio-keys,name = "gpio-keys";
keyR0 {
label = "Key_R0";
linux,code = <KEY_F5>;
gpios = <&gpio TEGRA_GPIO(Y, 2) GPIO_ACTIVE_LOW>;
debounce-interval = <30>;
};
keyL0 {
label = "Key_L0";
linux,code = <KEY_F1>;
gpios = <&gpio TEGRA_GPIO(I, 0) GPIO_ACTIVE_LOW>;
debounce-interval = <30>;
};
};
to the file tegra210-p3448-0000-p3449-0000-b00.dts. Key R0 works fine, but key L0 doesn’t work. My dmesg output contains:
$ dmesg|grep gpio-keys
[ 1.373725] gpio-keys gpio-keys: Failed to request GPIO 64, error -16
[ 1.373780] gpio-keys: probe of gpio-keys failed with error -16
I tried to modify the file tegra210-porg-gpio-p3448-0000-b00.dtsi:
/*This dtsi file was generated by Jetson_Nano_DeveloperKit_Users_Pinmux_Configuration.xlsm Revision: 1.02 */
/*
* Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <dt-bindings/gpio/tegra-gpio.h>
/ {
gpio: gpio@6000d000 {
gpio-init-names = "default";
gpio-init-0 = <&gpio_default>;
gpio_default: default {
gpio-input = <
TEGRA_GPIO(A, 5)
TEGRA_GPIO(X, 4)
TEGRA_GPIO(X, 5)
TEGRA_GPIO(X, 6)
TEGRA_GPIO(Y, 1)
TEGRA_GPIO(V, 1)
TEGRA_GPIO(Z, 2)
TEGRA_GPIO(H, 2)
TEGRA_GPIO(H, 5)
TEGRA_GPIO(H, 6)
TEGRA_GPIO(I, 0)
TEGRA_GPIO(I, 1)
TEGRA_GPIO(CC, 4)
>;
gpio-output-low = <
TEGRA_GPIO(S, 7)
TEGRA_GPIO(T, 0)
TEGRA_GPIO(Z, 3)
TEGRA_GPIO(H, 0)
TEGRA_GPIO(H, 3)
TEGRA_GPIO(H, 4)
TEGRA_GPIO(H, 7)
/* TEGRA_GPIO(I, 0) */
TEGRA_GPIO(I, 2)
>;
gpio-output-high = <
TEGRA_GPIO(A, 6)
TEGRA_GPIO(X, 3)
TEGRA_GPIO(CC, 7)
>;
};
};
};
and the file tegra210-porg-pinmux-p3448-0000-b00.dtsi with following:
nfc_en_pi0 {
nvidia,pins = "nfc_en_pi0";
nvidia,function = "rsvd0";
nvidia,pull = <TEGRA_PIN_PULL_UP>;
nvidia,tristate = <TEGRA_PIN_DISABLE>;
nvidia,enable-input = <TEGRA_PIN_ENABLE>;
};
Rebuild the dtb-file and copied it to my Jetson Nano. But nothing changes. Still Failed to request GPIO 64, error -16 error.
I googled a lot and found this post:
The leds_pwm was using the GPIO06 pin. I disabled in the device tree and in menuconfig and now am able to use these GPIOs without a busy error.
But I can’t find any leds_pwm in my device tree and in the dmesg output:
$ dmesg | grep leds
$
How can I fix this error?