[U-Boot] [PATCH 1/4] ARM: dts: dh-imx6: add wdt-reboot node for sysreset driver

Fabio Estevam festevam at gmail.com
Thu Nov 28 15:43:16 UTC 2019

Hi Claudius,

On Thu, Nov 28, 2019 at 12:31 PM Claudius Heine <ch at denx.de> wrote:

> Sorry, but we are probably misunderstanding each other here. So I try to
> go step by step to show how I think about this. Maybe that way we figure
> out where our understanding differs. Please bear with me, its a bit
> verbose :)

What I don't understand is why do we need "wdt-reboot" for i.MX in U-Boot?

The i.MX watchdog driver is capable of resetting via internal watchdog
or via a WDOG_B pin when the fsl,ext-reset-output property is passed.

> My patch adds the 'wdt-reboot' device node which is needed by u-boot to
> reset the device but doesn't exist in the linux kernel (since there is

Right. This is the point I don't understand: why do we need a U-Boot
wdt-reboot implementation in the first place?

The imx watchdog works in the kernel with DT. Why can't you just use
the same binding in U-Boot?


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