linux-kernel - Re: [PATCH v2 4/4] arm64: dts: broadcom: Add support for BCM2712

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Date: Fri, 10 May 2024 17:13:13 +0100
From: Marc Zyngier <maz@...nel.org>
To: Andrea della Porta <andrea.porta@...e.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 Florian Fainelli <florian.fainelli@...adcom.com>, Ray Jui
 <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>, Broadcom
 internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, Ulf
 Hansson <ulf.hansson@...aro.org>, Adrian Hunter <adrian.hunter@...el.com>,
 Kamal Dasu <kamal.dasu@...adcom.com>, Al Cooper <alcooperx@...il.com>, Eric
 Anholt <eric@...olt.net>, Stefan Wahren <wahrenst@....net>,
 devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-mmc@...r.kernel.org
Subject: Re: [PATCH v2 4/4] arm64: dts: broadcom: Add support for BCM2712

On 2024-05-10 15:35, Andrea della Porta wrote:
> The BCM2712 SoC family can be found on Raspberry Pi 5.
> Add minimal SoC and board (Rpi5 specific) dts file to be able to
> boot from SD card and use console on debug UART.
> 
> Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
> ---
>  arch/arm64/boot/dts/broadcom/Makefile         |   1 +
>  .../boot/dts/broadcom/bcm2712-rpi-5-b.dts     |  62 ++++
>  arch/arm64/boot/dts/broadcom/bcm2712.dtsi     | 302 ++++++++++++++++++
>  3 files changed, 365 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
>  create mode 100644 arch/arm64/boot/dts/broadcom/bcm2712.dtsi
> 

[...]

> +	psci {
> +		method = "smc";
> +		compatible = "arm,psci-1.0", "arm,psci-0.2", "arm,psci";
> +		cpu_on = <0xc4000003>;
> +		cpu_suspend = <0xc4000001>;
> +		cpu_off = <0x84000002>;

Please drop the PSCI function numbers. From PSCI-0.2, these are 
standard,
and what is implemented is discoverable.

> +	};
> +

[...]

> +	timer {
> +		compatible = "arm,armv8-timer";
> +		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) |
> +					  IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) |
> +					  IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) |
> +					  IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) |
> +					  IRQ_TYPE_LEVEL_LOW)>;

This is missing the EL2 virtual timer interrupt, as this is a 
VHE-capable
system.


> +		/* This only applies to the ARMv7 stub */
> +		arm,cpu-registers-not-fw-configured;

Please drop this. It makes no sense on a modern platform.

> +	};
> +};

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...