Re: [PATCH 09/10] arm64: ambarella: add ARCH_AMBARELLA and CV75 EVK DT

[Marc Zyngier]

On Thu, 30 Jul 2026 11:43:29 +0100,
Long Zhao <longzhao@xxxxxxxxxxxxx> wrote:

[...]

> diff --git a/arch/arm64/boot/dts/ambarella/cv75.dtsi b/arch/arm64/boot/dts/ambarella/cv75.dtsi
> new file mode 100644
> index 000000000000..7c6a61f473ef
> --- /dev/null
> +++ b/arch/arm64/boot/dts/ambarella/cv75.dtsi
> @@ -0,0 +1,151 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Ambarella CV75 SoC
> + *
> + * Boot peripheral: UART0 console.
> + * Clocks: a single ambarella,cv75-rct provider.
> + */
> +

[...]

> +       timer {
> +               compatible = "arm,armv8-timer";
> +               interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
> +                            <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
> +                            <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
> +                            <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>;
> +       };

You are missing the EL2 virtual timer interrupt, which is provided by
Cortex-A76. This isn't optional. A recent Linux kernel will shout at
you at boot time when booted at EL2 if this interrupt isn't present.

	M.

-- 
Without deviation from the norm, progress is not possible.