i want to use use the imx6ul internal watchdog nWdog ?

[1048929016]

Configuration is as follows:

devicetree:

&wdog1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_wdog>;
fsl,wdog_b;
fsl,use-wre;
fsl,ext-reset-output;
};

....

//add 内部看门狗的引脚配置
pinctrl_wdog: wdoggrp {
fsl,pins = <
MX6UL_PAD_LCD_RESET__WDOG1_WDOG_ANY 0x30b0
>;
};

use wdog1  .

i use imx_4.1.15_2.0.0_ga of  imx2_wdt.c:

imx2_wdt.c\watchdog\drivers - linux-imx - i.MX Linux kernel 

Successful configuration

but..

When the board is up, the pin is at a high level. After the software watchdog resets the pin,only power-on again ,this pin is high level.

why???  i want to use internal watchdog

[Yuri]

Hello,

  Hope the following helps.

https://community.nxp.com/message/926823 

Have a great day,

Yuri

------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer

button. Thank you!

[1048929016]

hello ,Mr. Yuri Muhin, I have successfully configured the pin, but what happens is that the pin is always output low level after power off to power on  about reset.

[Yuri]

Hello,

  You can test WDOG functionality, using software reset bit WDA  of Watchdog Control Register (WDOG_WCR).
WDOG_B signal remains asserted as long as the WDA bit is "0". 

Note, because of total system reset, performed by the board circuit, WDA will be also reset in default state ("1")

just after the WDOG reset.  

Regards,

Yuri.

[1048929016]

thanks

[1048929016]

this pin is always low level. only power-on again