Re: [PATCH v2 2/2] arm64: dts: zena: Add support for Zena CSS

[Krzysztof Kozlowski <krzk@kernel.org>]

On 12/02/2026 12:16, Debbie Horsfall wrote:
> Introduce the Zena CSS Fixed Virtual Platform (FVP) dts. This is
> currently the only Zena CSS variant, however the common definitions are
> included in a common dtsi for extensibility.
> 
> Signed-off-by: Debbie Horsfall <debbie.horsfall@arm.com>

...

> +
> +	timer {
> +		compatible = "arm,armv8-timer";
> +		interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_LOW>,
> +			     <GIC_PPI 14 IRQ_TYPE_LEVEL_LOW>,
> +			     <GIC_PPI 11 IRQ_TYPE_LEVEL_LOW>,
> +			     <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>,
> +			     <GIC_PPI 12 IRQ_TYPE_LEVEL_LOW>;
> +	};
> +
> +	sram: sram@104000 {

This belongs in the soc node.

> +		compatible = "mmio-sram";
> +		reg = <0x0 0x00104000 0x0 0x00001000>;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges = <0 0x0 0x00104000 0x00001000>;
> +
> +		scmi_shmem_tx: scpshmem-sram-section@0 {
> +			compatible = "arm,scmi-shmem";
> +			reg = <0x0 0x100>;
> +		};
> +
> +		scmi_shmem_rx: scpshmem-sram-section@100 {
> +			compatible = "arm,scmi-shmem";
> +			reg = <0x100 0x100>;
> +		};
> +	};
> +
> +	memory@80000000 {

And placing this in DTSI means that zena-css comes with this memory
mounted and it is not customizable in final FVP board.

> +		device_type = "memory";
> +
> +		/* ~2GB mapped at 2GB, another 2GB at 2TB */
> +		reg = <0x00000000 0x80000000 0x00000000 0x7f000000>,
> +		      <0x00000200 0x00000000 0x00000000 0x80000000>;
> +	};
> +};
> 


Best regards,
Krzysztof