[U-Boot] [PATCH 2/2] watchdog: designware: Convert to DM and DT probing

Marek Vasut marex at denx.de
Thu Oct 3 18:08:59 UTC 2019

On 10/3/19 8:06 PM, Simon Goldschmidt wrote:
> Marek Vasut schrieb am Do., 3. Okt. 2019, 09:22:
>> On 10/3/19 3:57 AM, Ley Foon Tan wrote:
>> [...]
>>>> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
>>>> index 6fd9b0a177..ec34993664 100644
>>>> --- a/drivers/watchdog/Kconfig
>>>> +++ b/drivers/watchdog/Kconfig
>>>> @@ -36,13 +36,6 @@ config ULP_WATCHDOG
>>>>         help
>>>>           Say Y here to enable i.MX7ULP watchdog driver.
>>>> -       bool "Designware watchdog timer support"
>>>> -       select HW_WATCHDOG
>>> CONFIG_HW_WATCHDOG is disabled now. Few areas of code in
>>> arm/mach-socfpga/ still using this CONFIG and call to
>>> hw_watchdog_init(). They need to remove too.
>>> Do we need call to uclass_get_device(UCLASS_WDT, 0, &dev) in SPL to
>>> probe watchdog and call to wdt_start() to start watchdog? Can't find
>>> place that start watchdog.
>> You're right, and the WDT is enabled early on, before the DM structures
>> are available.
>> I wonder whether we should do what we did on iMX -- have a non-DM WDT
>> driver for SPL and DM-one for U-Boot proper.
> Are you aware that DM WDT is enabled in SPL by default for gen5 now? I get
> a message that WDT is not found. I haven't sent a patch to fix that yet,
> since the message is the only thing that happens, works normally otherwise.
> But if you're working on that, you might check side effects of that setting
> (which is new for this release).

That doesn't sound right, the SoCFPGA core code uses HW_WATCHDOG in some
places as Ley pointed out, so if DM WDT is enabled in SPL, that code in
HW_WATCHDOG ifdefs isn't used. And I think that will trigger some weird
problems. So in the end, enabling DM watchdog in SoCFPGA SPL right now
is a bug ?


Best regards,
Marek Vasut

DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-56 Email: marex at denx.de

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