Re: [PATCH] arm64: tegra: Add CPU and PSCI nodes for NVIDIA Tegra210 platforms

From: Vagrant Cascadian <vagrant@debian.org>
To: Thierry Reding <thierry.reding@gmail.com>,
	Stephen Warren <swarren@nvidia.com>
Cc: linux-tegra@vger.kernel.org, devicetree@vger.kernel.org,
	Martin Michlmayr <tbm@cyrius.com>,
	linux-arm-kernel@lists.infradead.org,
	Jon Hunter <jonathanh@nvidia.com>
Subject: Re: [PATCH] arm64: tegra: Add CPU and PSCI nodes for NVIDIA Tegra210 platforms
Date: Sat, 08 Apr 2017 19:22:41 -0700	[thread overview]
Message-ID: <87vaqemia6.fsf@aikidev.net> (raw)
In-Reply-To: <1490701718-16571-1-git-send-email-jonathanh@nvidia.com>

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On 2017-03-28, Jon Hunter wrote:
> Add the CPU and PSCI nodes for the NVIDIA Tegra210 platforms so that
> all CPUs can be enabled on boot. This assumes that the PSCI firmware
> has been loaded during the initial bootstrap on the device before the
> kernel starts (which is typically the case for these platforms). The
> PSCI firmware version is set to v0.2 which aligns with the current
> shipping version for Tegra.
>
> Reported-by: Martin Michlmayr <tbm@cyrius.com>
> Signed-off-by: Jon Hunter <jonathanh@nvidia.com>

Tested on a jetson-tx1; all CPUs were recognized.

Tested-By: Vagrant Cascadian <vagrant@debian.org>

> ---
>  arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi | 23 +++++++++++++++++++++++
>  arch/arm64/boot/dts/nvidia/tegra210-p2530.dtsi | 24 ++++++++++++++++++++++++
>  2 files changed, 47 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi b/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
> index 906fb836d241..de1696c28140 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra210-p2180.dtsi
> @@ -296,6 +296,29 @@
>  		};
>  	};
>  
> +	cpus {
> +		cpu@0 {
> +			enable-method = "psci";
> +		};
> +
> +		cpu@1 {
> +			enable-method = "psci";
> +		};
> +
> +		cpu@2 {
> +			enable-method = "psci";
> +		};
> +
> +		cpu@3 {
> +			enable-method = "psci";
> +		};
> +	};
> +
> +	psci {
> +		compatible = "arm,psci-0.2";
> +		method = "smc";
> +	};
> +
>  	regulators {
>  		vdd_gpu: regulator@100 {
>  			compatible = "pwm-regulator";
> diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p2530.dtsi b/arch/arm64/boot/dts/nvidia/tegra210-p2530.dtsi
> index 0ec92578cacb..67cb039965fd 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra210-p2530.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra210-p2530.dtsi
> @@ -51,4 +51,28 @@
>  			clock-frequency = <32768>;
>  		};
>  	};
> +
> +	cpus {
> +		cpu@0 {
> +			enable-method = "psci";
> +		};
> +
> +		cpu@1 {
> +			enable-method = "psci";
> +		};
> +
> +		cpu@2 {
> +			enable-method = "psci";
> +		};
> +
> +		cpu@3 {
> +			enable-method = "psci";
> +		};
> +	};
> +
> +	psci {
> +		compatible = "arm,psci-0.2";
> +		method = "smc";
> +	};
> +
>  };
> -- 
> 2.7.4

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