avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/doc/device-tree-bindings/spmi/spmi-sandbox.txt

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+Sandbox SPMI emulated arbiter.
+
+This is bus driver for Sandbox. It includes part of emulated pm8916 pmic.
+
+Required properties:
+- compatible: "sandbox,spmi"
+- #address-cells: 0x1 - childs slave ID address
+- #size-cells: 0x1
+
+Example:
+
+spmi: spmi@0 {
+	compatible = "sandbox,spmi";
+	#address-cells = <0x1>;
+	#size-cells = <0x1>;
+	pm8916@0 {
+		compatible = "qcom,spmi-pmic";
+		reg = <0x0 0x1>;
+		#address-cells = <0x1>;
+		#size-cells = <0x1>;
+
+		spmi_gpios: gpios@c000 {
+			compatible = "qcom,pm8916-gpio";
+			reg = <0xc000 0x400>;
+			gpio-controller;
+			gpio-count = <4>;
+			#gpio-cells = <2>;
+			gpio-bank-name="spmi";
+		};
+	};
+};