Re: [PATCH v2] ARM: dts: sun8i-h2-plus-bananapi-m2-zero: add poweroff node to DT

[Michael Klein <michael@xxxxxxxxxxxx>]

On Tue, Nov 24, 2020 at 03:26:56PM +0100, Maxime Ripard wrote:
> On Tue, Nov 24, 2020 at 02:36:33PM +0100, Michael Klein wrote:
> > Add poweroff node to allow the board to power itself off after shutdown
> > by disabling the SYSTEM and CPUX regulators (U5 resp. U6).  The RST
> > button can be used to restart the board.
> >
> > Signed-off-by: Michael Klein <michael@xxxxxxxxxxxx>
> > ---
> >  arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts | 5 +++++
> >  1 file changed, 5 insertions(+)
>
> You should have a summary of the changes between versions here
>
> > diff --git a/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts b/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts
> > index 4c6704e4c57e..ea2fa48a1647 100644
> > --- a/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts
> > +++ b/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts
> > @@ -46,6 +46,11 @@ sw4 {
> >  		};
> >  	};
> >
> > +	poweroff {
> > +		compatible = "gpio-poweroff";
> > +		gpios = <&r_pio 0 8 GPIO_ACTIVE_LOW>; /* PL8 */
> > +	};
> > +
>
> Like I said in the previous version, this should really be modelled as a
> regulator instead of just a GPIO

Please excuse my ignorance, do you mean something like this?

       reg_vdd_sys: vdd-sys {
               compatible = "regulator-fixed";
               regulator-name = "vdd-sys";
               regulator-min-microvolt = <1200000>;
               regulator-max-microvolt = <1200000>;
               regulator-always-on;
               regulator-boot-on;
               enable-active-high;
               gpio = <&r_pio 0 8 GPIO_ACTIVE_HIGH>; /* PL8 */
               vin-supply = <&reg_vcc5v0>;
        };

With this, the board still draws 60mA (cheap USB ampere meter) after 
shutdown, presumably because of "regulator-always-on".  Without this 
property the board powers off shortly after booting up.

Michael