Re: [PATCHv1 1/3] arm64: dts: meson-g12b-odroid-n2: Enable RTC controller node

[Anand Moon <linux.amoon@gmail.com>]

Hi Jerome,

Thanks for your review comments.

On Thu, 16 Jul 2020 at 13:38, Jerome Brunet <jbrunet@baylibre.com> wrote:
>
>
> On Wed 15 Jul 2020 at 18:02, Anand Moon <linux.amoon@gmail.com> wrote:
>
> > Enable RTC PCF8563 node on Odroid-N2 SBC, In order
> > to support the RTC wakealarm feature for suspend and resume.
> >
> > Cc: Neil Armstrong <narmstrong@baylibre.com>
> > Cc: Kevin Hilman <khilman@baylibre.com>
> > Signed-off-by: Anand Moon <linux.amoon@gmail.com>
> > ---
> > $ sudo hwclock -r && date
> > 2020-07-15 13:11:53.862508+00:00
> > Wed Jul 15 13:11:54 UTC 2020
> >
> > $ hwclock --show
> > 2020-07-15 13:17:30.903300+00:00
> >
> > But RTC wake up is not working at my end.
> > Any inputs are welcome.
> >
> > $ time rtcwake -s 30 -m mem
> > rtcwake: /dev/rtc0 not enabled for wakeup events
> >
> > real    0m0.002s
> > user    0m0.002s
> > sys     0m0.000s
> > ---
> >  .../boot/dts/amlogic/meson-g12b-odroid-n2.dts      | 14 ++++++++++++++
> >  1 file changed, 14 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> > index 169ea283d4ee..a447cba4dd53 100644
> > --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> > +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> > @@ -391,6 +391,20 @@ hdmi_tx_tmds_out: endpoint {
> >       };
> >  };
> >
> > +&i2c3 {
> > +     pinctrl-0 = <&i2c3_sda_a_pins>, <&i2c3_sck_a_pins>;
> > +     pinctrl-names = "default";
> > +     status = "okay";
> > +
> > +     rtc: rtc@51 {
> > +             reg = <0x51>;
> > +             compatible = "nxp,pcf8563";
> > +             #clock-cells = <0>;
> > +             clock-frequency = <32768>;
> > +             clock-output-names = "rtc_clkout";
> > +     };
>
> This rtc being on a connector, optional and not fitted by default,
> should it really be enabled for all odroid-n2 ?
>
> We tend not do that usually

My thought process was there will be an Internal primary interrupt pin
that handles
RTC wakeup and is connected to the CPU and IO peripherals..

-Anand

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