Can't enable PPS on AGX Xavier

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
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1

你好，我现在在agx xavier使能pps驱动，系统版本是35.1.0，做法如下：

  1. 在tegra194-p2888-0000-a00.dtsi中加入pps模块：
    pps {
    //here use gpio for the pin in which you want pps signal.
    gpios = <&tegra_main_gpio TEGRA194_MAIN_GPIO(A, 0) GPIO_ACTIVE_LOW>;
    compatible = “pps-gpio”;
    assert-falling-edge;
    status = “okay”;
    };
  2. 修改了pps-gpio.c（line 189 return -EINVAL 改为 return ret）
    然后运行./nvbuild.sh -o $PWD/kernel_out 编译出tegra194-p2888-0001-p2822-0000.dtb 和 Image，然后刷到Xavier中，发现可以在dmesg中看到pps0,设备，但是还是会有报错，kernel log如下：
    [ 0.447522] pps_core: LinuxPPS API ver. 1 registered
    [ 0.447531] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti giometti@linux.it
    [ 2.973651] pps-gpio pps: failed to request PPS GPIO
    [ 5.771731] pps_core: source pps.-1 got cdev (246:0)
    [ 5.771750] pps pps0: new PPS source pps.-1
    [ 5.775693] pps pps0: Registered IRQ 284 as PPS source
    并且接入pps信号利用ppstest 工具去看还是有问题，无法正常解析。
    可以帮我看下是什么问题吗？
3

please see-also HOW to Increase GNNS timing module on Xavier? - #9 by shgarg, thanks

4

我按照这个文档上的内容去操作，现在已经不能开机了。。。
重刷系统后也无法回到之前有pps0设备的状态。。。

5

hello m18829573782,

may I know what’s the complete steps, and also the bootloader logs about the boot failure.

6
  1. 从官网下载源码：
    https://developer.nvidia.com/embedded/jetson-linux-r351
    下载的文件是： Driver Package (BSP) Sources
7

然后按照这个链接下面的说明进行操作：
https://docs.nvidia.com/jetson/archives/r34.1/DeveloperGuide/text/SD/Kernel/KernelCustomization.html

8

在进行编译前我在hardware/nvidia/platform/t19x/galen/kernel-dts/common/tegra194-p2888-0000-a00.dtsi这个文件中加入了pps node，以及在pps-gpio.c中进行了最上面的修改，然后执行./nvbuild.sh -o $PWD/kernel_out进行编译

9

after a long long time debuging, now it can worked!
my practice is as belows:

11

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