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

Claudius Heine ch at denx.de
Fri Nov 29 07:36:31 UTC 2019

Hi Fabio,

On 28/11/2019 16.43, Fabio Estevam wrote:
> 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.

Ok, right. Well my patches fixes the 'reset' command in u-boot and for
that we need a sysreset driver in u-boot currently.

The watchdog itself works fine IIRC.

>> 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?
> Thanks

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