Re: [PATCH 4/4] ARM64: dts: imx: add i.MX8QXP system controller RTC support

From: Alexandre Belloni
Date: Wed Nov 28 2018 - 04:59:01 EST

On 28/11/2018 09:41:22+0000, Anson Huang wrote:
> > > i.MX SoCs ONLY have 1 RTC. And RTC are always enabled by default for
> > > all i.MX SoCs, so do we have to disable it here and enable it in board dts?
> > >
> >
> > I would say that most of the i.MX based boards include another RTC because
> > the SoC one consumes way too much power.
> >
> > Note that I don't care too much whether it is enabled by default, I was simply
> > explaining why you may want to disable it by default.
> OK, this system controller RTC is a little different, it is controlled by system controller firmware,
> and system controller firmware will always select the best one for its user(Linux kernel) if there are other
> RTCs available, so I think we can keep it enabled by default for now. Thanks.

Do you mean that the plan is to push support for the external RTCs (e.g.
the i2c ones) to the M4 firmware?

Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering