Store custom keys on SDM Agilex3

I have read trough the documentation, but I still don't understand how I can send commands to the SDM from linux running on the HPS. Do I need to install any drivers or do some changes to the device tree. Here is the device tree node I have for the SDM:

firmware {
		svc {
			compatible = "intel,agilex5-svc";
			method = "smc";
			memory-region = <&service_reserved>;
			iommus = <&smmu 10>;
			interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>;
			interrupt-parent = <&intc>;
			altr,smmu_enable_quirk;

			fpga_mgr: fpga-mgr {
				compatible = "intel,agilex5-soc-fpga-mgr";
				altr,smmu_enable_quirk;
			};

			temp_volt: hwmon {
				compatible = "intel,soc64-hwmon";
			};

			fcs_config: fcs-config {
				compatible = "intel,agilex5-soc-fcs-config";
			};
		};
	};

I have installed the FCS driver:

root@agilex3:~# zcat /proc/config.gz | grep FCS
CONFIG_ALTERA_SOCFPGA_FCS_DEBUG=y
CONFIG_CRYPTO_DEV_INTEL_FCS=y

Is there any other drivers I need?