Re: [rtc-linux] [PATCH] watchdog: stmp3xxx: Implement GETBOOTSTATUS

Alexandre Belloni
2015-05-05T09:40:34Z

Hi,

On 20/04/2015 at 09:11:02 +0200, harald@ccbib.org wrote :
> Hi Alexandre,
>
> On Sun, 19 Apr 2015 17:37:43 +0200, Alexandre Belloni
> <alexandre.belloni@free-electrons.com> wrote:
> > On 19/04/2015 at 15:41:42 +0200, harald@ccbib.org wrote :
> >> > - use syscon instead of passing callbacks to the watchdog driver
> >>
> >> I will put looking into this onto my todo list, but I'm not familiar
> >> with syscon yet and it is not obvious to me how to port the rtc driver
> >> to syscon without breaking devicetree backwards compatibility. So I'd
> >> like to defer this for later unless somebody gives me some guidance.
> >>
> >
> > As the rtc driver is the one instantiating the watchdog driver, there is
> > no reason why the DT ABI would be broken. You simply have to create
> > the syscon in the RTC driver and then pass it to the watchdog driver,
> > the same way it is done with the callbacks.
>
> Ok, this is less invasive than what I have been thinking. This makes
> sense.
>

I realized I confused syscon with regmap. So indeed, switching to syscon
will require a not nice change to the DT. But what I really meant was
creating a regmap from the rtc driver and pass it to the watchdog
driver.

> > I can have a look at doing it as I have some i.mx28 platforms.
>
> If you can point me to a driver that is a good reference for your model,
> then I can do this myself. Otherwise I'd prefer if you wrote the code.
> I can do the testing though, if this helps.
>

You can have a look at the devm_regmap_init_mmio() users.