Re: [PATCH] arm64: dts: allwinner: enable h616 timer support

["Jernej Škrabec" <jernej.skrabec@gmail.com>]

Dne nedelja, 29. marec 2026 ob 14:07:19 Srednjeevropski poletni čas je Michal Piekos napisal(a):
> On Sun, Mar 29, 2026 at 01:53:45PM +0200, Jernej Škrabec wrote:
> > Dne nedelja, 29. marec 2026 ob 13:43:04 Srednjeevropski poletni čas je Michal Piekos napisal(a):
> > > Add support for timer by reusing existing sun4i timer driver.
> > > 
> > > H616 timer is compatible with earlier sunxi timer variants and provides
> > > both clocksource and clockevent functionality. It runs from 24 MHz
> > > oscillator. It can serve as broadcast clockevent for wake up from idle
> > > states.
> > > 
> > > Tested on Orange Pi Zero 3:
> > > - timer is registered as clocksource:
> > > - switching clocksource at runtime works
> > > - timer operates as a broadcast clockevent device
> > > - no regression observed compared to arch_sys_counter
> > > 
> > > Signed-off-by: Michal Piekos <michal.piekos@mmpsystems.pl>
> > > ---
> > > Test results:
> > > 
> > > Clocksource switching:
> > >   cat /sys/devices/system/clocksource/clocksource0/available_clocksource
> > >     arch_sys_counter timer
> > >   echo timer > /sys/devices/system/clocksource/clocksource0/current_clocksource
> > >     [ 5031.105997] clocksource: Switched to clocksource timer
> > > 
> > > Clockevent configuration:
> > >   cat /proc/timer_list
> > >     ...
> > >     Tick Device: mode:     1
> > >     Broadcast device
> > >     Clock Event Device: sun4i_tick
> > >      max_delta_ns:   178956969070
> > >      min_delta_ns:   1000
> > >      mult:           51539608
> > >      shift:          31
> > >      mode:           1
> > >      next_event:     9223372036854775807 nsecs
> > >      set_next_event: sun4i_clkevt_next_event
> > >      shutdown:       sun4i_clkevt_shutdown
> > >      periodic:       sun4i_clkevt_set_periodic
> > >      oneshot:        sun4i_clkevt_set_oneshot
> > >      resume:         sun4i_clkevt_shutdown
> > >      event_handler:  tick_handle_oneshot_broadcast
> > >     ...
> > > 
> > > Cyclictest measurements:
> > >   Dominated by system scheduler latency and do not reflect clocksource
> > >   precision.
> > > ---
> > >  arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi | 9 +++++++++
> > >  1 file changed, 9 insertions(+)
> > > 
> > > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi
> > > index 8d1110c14bad..bf054869e78b 100644
> > > --- a/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi
> > > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi
> > > @@ -228,6 +228,15 @@ cpu_speed_grade: cpu-speed-grade@0 {
> > >  			};
> > >  		};
> > >  
> > > +		timer0: timer@3009000 {
> > > +			compatible = "allwinner,sun50i-h616-timer",
> > > +				     "allwinner,sun8i-a23-timer";
> > 
> > You have to add above combo to DT bindings.
> > 
> > Best regards,
> > Jernej
> 
> Not sure I understand your comment correctly but binding for h616 is already
> there:
> 
> Documentation/devicetree/bindings/timer/allwinner,sun4i-a10-timer.yaml:21-27
>   - items:
>     - enum:
>         - allwinner,sun20i-d1-timer
>         - allwinner,sun50i-a64-timer
>         - allwinner,sun50i-h6-timer
>         - allwinner,sun50i-h616-timer
>     - const: allwinner,sun8i-a23-timer
> 
> BR
> Michal

Sorry, sometimes tooling fails me. All good.

Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

> 
> > 
> > > +			reg = <0x03009000 0xa0>;
> > > +			interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>,
> > > +				     <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>;
> > > +			clocks = <&osc24M>;
> > > +		};
> > > +
> > >  		watchdog: watchdog@30090a0 {
> > >  			compatible = "allwinner,sun50i-h616-wdt",
> > >  				     "allwinner,sun6i-a31-wdt";
> > > 
> > > ---
> > > base-commit: be762d8b6dd7efacb61937d20f8475db8f207655
> > > change-id: 20260328-h616-timer-046e6ac3549e
> > > 
> > > Best regards,
> > > 
> > 
> > 
> > 
> > 
>