linux-kernel - Re: [PATCH v2 1/3] ARM: dts: rockchip: Add psci for rk3036

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Date: Wed, 20 Dec 2023 12:16:14 +0100
From: Alex Bee <knaerzche@...il.com>
To: Andy Yan <andyshrk@....com>, heiko@...ech.de
Cc: krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
 zhengxing@...k-chips.com, Andy Yan <andy.yan@...k-chips.com>
Subject: Re: [PATCH v2 1/3] ARM: dts: rockchip: Add psci for rk3036

Hi Andy,
Am 18.12.23 um 11:55 schrieb Andy Yan:
> From: Andy Yan <andy.yan@...k-chips.com>
> 
> The system will hang at bringup secondary CPUs
> without psci node.
> 
> Signed-off-by: Andy Yan <andy.yan@...k-chips.com>
> 
> ---
> 
> (no changes since v1)
> 
>   arch/arm/boot/dts/rockchip/rk3036.dtsi | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/rockchip/rk3036.dtsi b/arch/arm/boot/dts/rockchip/rk3036.dtsi
> index 78686fc72ce6..5344803442a1 100644
> --- a/arch/arm/boot/dts/rockchip/rk3036.dtsi
> +++ b/arch/arm/boot/dts/rockchip/rk3036.dtsi
> @@ -67,6 +67,11 @@ display-subsystem {
>   		ports = <&vop_out>;
>   	};
>   
> +	psci {
> +		compatible = "arm,psci-1.0";
> +		method = "smc";
> +	};
> +
I don't think that's an good idea. You most likely need that because you 
have downstream bootloader installed on this board. PSCI implementation 
takes place in TEE-OS for Rockchips ARM SoCs. There is no support for 
RK3036 in upstream op-tee OS. It's pretty much the same for RK3128 and 
RK3288.
If you use upstream u-boot it should be good as-is.

Alex
>   	timer {
>   		compatible = "arm,armv7-timer";
>   		arm,cpu-registers-not-fw-configured;