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/pmic/max77686.txt

@@ -0,0 +1,35 @@
+MAXIM, MAX77686 pmic
+
+This device uses two drivers:
+- drivers/power/pmic/max77686.c (for parent device)
+- drivers/power/regulator/max77686.c (for child regulators)
+
+This file describes the binding info for the PMIC driver.
+
+To bind the regulators, please read the additional binding info:
+- doc/device-tree-bindings/regulator/max77686.txt
+
+Required properties:
+- compatible: "maxim,max77686"
+- reg = 0x9
+
+With those two properties, the pmic device can be used for read/write only.
+To bind each regulator, the optional regulators subnode should exists.
+
+Optional subnode:
+- voltage-regulators: subnode list of each device's regulator
+  (see max77686.txt - regulator binding info)
+
+Example:
+
+max77686@09 {
+	compatible = "maxim,max77686";
+	reg = <0x09>;
+
+	voltage-regulators {
+		ldo1 {
+			...
+		};
+		...
+	};
+};

u-boot/doc/device-tree-bindings/pmic/pm8916.txt

@@ -0,0 +1,18 @@
+Qualcomm pm8916 PMIC
+
+This PMIC is connected using SPMI bus so should be child of SPMI bus controller.
+
+Required properties:
+- compatible: "qcom,spmi-pmic";
+- reg: SPMI Slave ID, size (ignored)
+- #address-cells: 0x1 (peripheral ID)
+- #size-cells: 0x1 (size of peripheral register space)
+
+Example:
+
+pm8916@0 {
+	compatible = "qcom,spmi-pmic";
+	reg = <0x0 0x1>;
+	#address-cells = <0x1>;
+	#size-cells = <0x1>;
+};

u-boot/doc/device-tree-bindings/pmic/s2mps11.txt

@@ -0,0 +1,17 @@
+SAMSUNG, S2MPS11 PMIC
+
+This file describes the binding info for the PMIC driver:
+- drivers/power/pmic/s2mps11.c
+
+Required properties:
+- compatible: "samsung,s2mps11-pmic"
+- reg = 0x66
+
+With those two properties, the pmic device can be used for read/write only.
+
+Example:
+
+s2mps11@66 {
+	compatible = "samsung,s2mps11-pmic";
+	reg = <0x66>;
+};

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

@@ -0,0 +1,35 @@
+Sandbox pmic
+
+This device uses two drivers:
+- drivers/power/pmic/sandbox.c (for parent device)
+- drivers/power/regulator/sandbox.c (for child regulators)
+
+This file describes the binding info for the PMIC driver.
+
+To bind the regulators, please read the regulator binding info:
+- doc/device-tree-bindings/regulator/sandbox.txt
+
+Required PMIC node properties:
+- compatible: "sandbox,pmic"
+- reg = 0x40
+
+Required PMIC's "emul" subnode,  with property:
+- compatible: "sandbox,i2c-pmic"
+
+With the above properties, the pmic device can be used for read/write only.
+To bind each regulator, the optional regulator subnodes should exists.
+
+Optional subnodes:
+- ldo/buck subnodes of each device's regulator (see regulator binding info)
+
+Example:
+
+sandbox_pmic {
+	compatible = "sandbox,pmic";
+	reg = <0x40>;
+
+	/* Mandatory for I/O */
+	emul {
+		compatible = "sandbox,i2c-pmic";
+	};
+};