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/regulator/fixed.txt

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+Fixed Voltage regulator
+
+Binding:
+The binding is done by the property "compatible" - this is different, than for
+binding by the node prefix (doc/device-tree-bindings/regulator/regulator.txt).
+
+Required properties:
+- compatible: "regulator-fixed"
+- regulator-name: this is required by the regulator uclass
+
+Optional properties:
+- gpio: GPIO to use for enable control
+- regulator constraints (binding info: regulator.txt)
+
+Other kernel-style properties, are currently not used.
+
+Note:
+For the regulator constraints, driver expects that:
+- regulator-min-microvolt is equal to regulator-max-microvolt
+- regulator-min-microamp is equal to regulator-max-microamp
+
+Example:
+fixed_regulator@0 {
+	/* Mandatory */
+	compatible = "regulator-fixed";
+	regulator-name = "LED_3.3V";
+
+	/* Optional: */
+	gpio = <&gpc1 0 GPIO_ACTIVE_LOW>;
+
+	/* Optional for regulator uclass */
+	regulator-min-microvolt = <3300000>;
+	regulator-max-microvolt = <3300000>;
+	regulator-min-microamp = <15000>;
+	regulator-max-microamp = <15000>;
+	regulator-always-on;
+	regulator-boot-on;
+};

u-boot/doc/device-tree-bindings/regulator/max77686.txt

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+MAXIM, MAX77686 regulators
+
+This device uses two drivers:
+- drivers/power/pmic/max77686.c (as parent I/O device)
+- drivers/power/regulator/max77686.c (for child regulators)
+
+This file describes the binding info for the REGULATOR driver.
+
+First, please read the binding info for the pmic:
+- doc/device-tree-bindings/pmic/max77686.txt
+
+Required subnode:
+- voltage-regulators: required for the PMIC driver
+
+Required properties:
+- regulator-name: used for regulator uclass platform data '.name'
+
+Optional:
+- regulator-min-microvolt: minimum allowed Voltage to set
+- regulator-max-microvolt: minimum allowed Voltage to set
+- regulator-always-on: regulator should be never disabled
+- regulator-boot-on: regulator should be enabled by the bootloader
+
+Example:
+(subnode of max77686 pmic node)
+voltage-regulators {
+	ldo1 {
+		regulator-name = "VDD_ALIVE_1.0V";
+		regulator-min-microvolt = <1000000>;
+		regulator-max-microvolt = <1000000>;
+		regulator-always-on;
+		regulator-boot-on;
+	};
+
+	ldo2 {
+		regulator-name = "VDDQ_VM1M2_1.2V";
+		regulator-min-microvolt = <1200000>;
+		regulator-max-microvolt = <1200000>;
+		regulator-always-on;
+		regulator-boot-on;
+	};
+	.
+	.
+	.
+	ldo26 {
+		regulator-name = "nc";
+		regulator-min-microvolt = <3000000>;
+		regulator-max-microvolt = <3000000>;
+		regulator-always-on;
+		regulator-boot-on;
+	};
+
+	buck1 {
+		regulator-compatible = "BUCK1";
+		regulator-name = "VDD_MIF_1.0V";
+		regulator-min-microvolt = <8500000>;
+		regulator-max-microvolt = <1100000>;
+		regulator-always-on;
+		regulator-boot-on;
+	};
+	.
+	.
+	.
+	buck9 {
+		regulator-compatible = "BUCK9";
+		regulator-name = "nc";
+		regulator-min-microvolt = <1200000>;
+		regulator-max-microvolt = <1200000>;
+	};
+};

u-boot/doc/device-tree-bindings/regulator/regulator.txt

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+Voltage/Current regulator
+
+Binding:
+The regulator devices don't use the "compatible" property. The binding is done
+by the prefix of regulator node's name. Usually the pmic I/O driver will provide
+the array of 'struct pmic_child_info' with the prefixes and compatible drivers.
+The bind is done by calling function: pmic_bind_childs().
+Example drivers:
+pmic: drivers/power/pmic/max77686.c
+regulator: drivers/power/regulator/max77686.c
+
+For the node name e.g.: "prefix[:alpha:]num { ... }":
+- the driver prefix should be: "prefix" or "PREFIX" - case insensitive
+- the node name's "num" is set as "dev->driver_data" on bind
+
+Example the prefix "ldo" will pass for: "ldo1", "ldo@1", "LDO1", "LDOREG@1"...
+
+Optional properties:
+- regulator-name: a string, required by the regulator uclass
+- regulator-min-microvolt: a minimum allowed Voltage value
+- regulator-max-microvolt: a maximum allowed Voltage value
+- regulator-min-microamp: a minimum allowed Current value
+- regulator-max-microamp: a maximum allowed Current value
+- regulator-always-on: regulator should never be disabled
+- regulator-boot-on: enabled by bootloader/firmware
+
+Note
+The "regulator-name" constraint is used for setting the device's uclass
+platform data '.name' field. And the regulator device name is set from
+it's node name. If "regulator-name" is not provided in dts, node name
+is chosen for setting the device's uclass platform data '.name' field.
+
+Other kernel-style properties, are currently not used.
+
+Note:
+For the regulator autoset from constraints, the framework expects that:
+- regulator-min-microvolt is equal to regulator-max-microvolt
+- regulator-min-microamp is equal to regulator-max-microamp
+- regulator-always-on or regulator-boot-on is set
+
+Example:
+ldo0 {
+	/* Optional */
+	regulator-name = "VDDQ_EMMC_1.8V";
+	regulator-min-microvolt = <1800000>;
+	regulator-max-microvolt = <1800000>;
+	regulator-min-microamp = <100000>;
+	regulator-max-microamp = <100000>;
+	regulator-always-on;
+	regulator-boot-on;
+};

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

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+Sandbox, PMIC regulators
+
+This device uses two drivers:
+- drivers/power/pmic/sandbox.c (as parent I/O device)
+- drivers/power/regulator/sandbox.c (for child regulators)
+
+This file describes the binding info for the REGULATOR driver.
+
+First, please read the binding info for the PMIC:
+- doc/device-tree-bindings/pmic/sandbox.txt
+
+Required subnodes:
+- ldoN { };
+- buckN { };
+
+The sandbox PMIC can support: ldo1, ldo2, buck1, buck2.
+
+For each PMIC's regulator subnode, there is one required property:
+- regulator-name: used for regulator uclass platform data '.name'
+
+Optional:
+- regulator-min-microvolt: minimum allowed Voltage to set
+- regulator-max-microvolt: minimum allowed Voltage to set
+- regulator-min-microamps: minimum allowed Current limit to set (LDO1/BUCK1)
+- regulator-max-microamps: minimum allowed Current limit to set (LDO1/BUCK1)
+- regulator-always-on: regulator should be never disabled
+- regulator-boot-on: regulator should be enabled by the bootloader
+
+Example PMIC's regulator subnodes:
+
+ldo1 {
+	regulator-name = "VDD_1.0V";
+	regulator-min-microvolt = <1000000>;
+	regulator-max-microvolt = <1200000>;
+	regulator-min-microamps = <100000>;
+	regulator-max-microamps = <400000>;
+	regulator-always-on;
+};
+
+buck2 {
+	regulator-name = "VDD_1.8V";
+	regulator-min-microvolt = <1800000>;
+	regulator-max-microvolt = <1800000>;
+	regulator-boot-on;
+};

u-boot/doc/device-tree-bindings/regulator/tps65090.txt

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+TPS65090 regulators
+
+Required properties:
+- compatible: "ti,tps65090"
+- reg: I2C slave address
+- interrupts: the interrupt outputs of the controller
+- regulators: A node that houses a sub-node for each regulator within the
+  device. Each sub-node is identified using the node's name, with valid
+  values listed below. The content of each sub-node is defined by the
+  standard binding for regulators; see regulator.txt.
+  dcdc[1-3], fet[1-7] and ldo[1-2] respectively.
+- vsys[1-3]-supply: The input supply for DCDC[1-3] respectively.
+- infet[1-7]-supply: The input supply for FET[1-7] respectively.
+- vsys-l[1-2]-supply: The input supply for LDO[1-2] respectively.
+
+Optional properties:
+- ti,enable-ext-control: This is applicable for DCDC1, DCDC2 and DCDC3.
+  If DCDCs are externally controlled then this property should be there.
+- "dcdc-ext-control-gpios: This is applicable for DCDC1, DCDC2 and DCDC3.
+  If DCDCs are externally controlled and if it is from GPIO then GPIO
+  number should be provided. If it is externally controlled and no GPIO
+  entry then driver will just configure this rails as external control
+  and will not provide any enable/disable APIs.
+
+Each regulator is defined using the standard binding for regulators.
+
+Example:
+
+	tps65090@48 {
+		compatible = "ti,tps65090";
+		reg = <0x48>;
+		interrupts = <0 88 0x4>;
+
+		vsys1-supply = <&some_reg>;
+		vsys2-supply = <&some_reg>;
+		vsys3-supply = <&some_reg>;
+		infet1-supply = <&some_reg>;
+		infet2-supply = <&some_reg>;
+		infet3-supply = <&some_reg>;
+		infet4-supply = <&some_reg>;
+		infet5-supply = <&some_reg>;
+		infet6-supply = <&some_reg>;
+		infet7-supply = <&some_reg>;
+		vsys_l1-supply = <&some_reg>;
+		vsys_l2-supply = <&some_reg>;
+
+		regulators {
+			dcdc1 {
+				regulator-name = "dcdc1";
+				regulator-boot-on;
+				regulator-always-on;
+				ti,enable-ext-control;
+				dcdc-ext-control-gpios = <&gpio 10 0>;
+			};
+
+			dcdc2 {
+				regulator-name = "dcdc2";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			dcdc3 {
+				regulator-name = "dcdc3";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet1 {
+				regulator-name = "fet1";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet2 {
+				regulator-name = "fet2";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet3 {
+				regulator-name = "fet3";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet4 {
+				regulator-name = "fet4";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet5 {
+				regulator-name = "fet5";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet6 {
+				regulator-name = "fet6";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			fet7 {
+				regulator-name = "fet7";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			ldo1 {
+				regulator-name = "ldo1";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			ldo2 {
+				regulator-name = "ldo2";
+				regulator-boot-on;
+				regulator-always-on;
+			};
+		};
+	};