Re: [PATCH v2 07/10] arm64: tegra: Add VPR placeholder node on Tegra234

[Maxime Ripard <mripard@redhat.com>]

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On Thu, Jan 22, 2026 at 05:10:06PM +0100, Thierry Reding wrote:
> From: Thierry Reding <treding@nvidia.com>
> 
> This node contains two sets of properties, one for the case where the
> VPR is resizable (in which case the VPR region will be dynamically
> allocated at boot time) and another case where the VPR is fixed in size
> and initialized by early firmware.
> 
> The firmware running on the device is responsible for updating the node
> with the real physical address for the fixed VPR case and remove the
> properties needed only for resizable VPR. Similarly, if the VPR is
> resizable, the firmware should remove the "reg" property since it is no
> longer needed.
> 
> Signed-off-by: Thierry Reding <treding@nvidia.com>
> ---
>  arch/arm64/boot/dts/nvidia/tegra234.dtsi | 34 ++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
> index 850c473235e3..62a5dfde9e38 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
> @@ -29,6 +29,40 @@ aliases {
>  		i2c8 = &dp_aux_ch3_i2c;
>  	};
>  
> +	reserved-memory {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		vpr: video-protection-region@0 {
> +			compatible = "nvidia,tegra-video-protection-region";

The heap name doesn't follow the documented convention, see
https://docs.kernel.org/userspace-api/dma-buf-heaps.html#naming-convention

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