[PATCH 03/16] dt-bindings: timer: arm,arch_timer: Fix requirements for interrupt description

[Rob Herring (Arm)]

On Thu, 07 May 2026 13:55:31 +0100, Marc Zyngier wrote:
> The arm,arch_timer DT binding is extremely imprecise in describing
> the requirements for interrupts.
> 
> Follow the architecture by making it explicit that:
> - the EL1 secure timer irq is required if EL3 is implemented
> - the EL1 physical timer irq is always required
> - the EL1 virtual timer irq is always required
> - the EL2 physical timer irq is required if EL2 is implemented
> - the EL2 virtual timer irq is required if FEAT_VHE is implemented
> 
> The consequence of the above is that the minimum number of interrupts
> to be described is 2, and not 1.
> 
> Finally, clean up the description which made the assumption that
> the timers are plugged into a GIC (unfortunately, that's not always
> true), drop the MMIO nonsense that has long be moved to a separate
> binding, and use the architectural terminology to describe the various
> interrupts.
> 
> Signed-off-by: Marc Zyngier <maz at kernel.org>
> ---
>  .../bindings/timer/arm,arch_timer.yaml        | 21 +++++++------------
>  1 file changed, 8 insertions(+), 13 deletions(-)
> 

Acked-by: Rob Herring (Arm) <robh at kernel.org>