Marvell Berlin SoC Family Device Tree Bindings
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Work in progress statement:
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Device tree files and bindings applying to Marvell Berlin SoCs and boards are
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considered "unstable". Any Marvell Berlin device tree binding may change at any
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time. Be sure to use a device tree binary and a kernel image generated from the
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same source tree.
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Please refer to Documentation/devicetree/bindings/ABI.txt for a definition of a
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stable binding/ABI.
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Boards with a SoC of the Marvell Berlin family, e.g. Armada 1500
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shall have the following properties:
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* Required root node properties:
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compatible: must contain "marvell,berlin"
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In addition, the above compatible shall be extended with the specific
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SoC and board used. Currently known SoC compatibles are:
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"marvell,berlin2" for Marvell Armada 1500 (BG2, 88DE3100),
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"marvell,berlin2cd" for Marvell Armada 1500-mini (BG2CD, 88DE3005)
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"marvell,berlin2ct" for Marvell Armada ? (BG2CT, 88DE????)
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"marvell,berlin2q" for Marvell Armada 1500-pro (BG2Q, 88DE3114)
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"marvell,berlin3" for Marvell Armada ? (BG3, 88DE????)
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* Example:
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/ {
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model = "Sony NSZ-GS7";
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compatible = "sony,nsz-gs7", "marvell,berlin2", "marvell,berlin";
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...
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}
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* Marvell Berlin CPU control bindings
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CPU control register allows various operations on CPUs, like resetting them
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independently.
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Required properties:
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- compatible: should be "marvell,berlin-cpu-ctrl"
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- reg: address and length of the register set
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Example:
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cpu-ctrl@f7dd0000 {
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compatible = "marvell,berlin-cpu-ctrl";
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reg = <0xf7dd0000 0x10000>;
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};
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* Marvell Berlin2 chip control binding
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Marvell Berlin SoCs have a chip control register set providing several
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individual registers dealing with pinmux, padmux, clock, reset, and secondary
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CPU boot address. Unfortunately, the individual registers are spread among the
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chip control registers, so there should be a single DT node only providing the
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different functions which are described below.
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Required properties:
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- compatible:
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* the first and second values must be:
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"simple-mfd", "syscon"
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- reg: address and length of following register sets for
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BG2/BG2CD: chip control register set
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BG2Q: chip control register set and cpu pll registers
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* Marvell Berlin2 system control binding
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Marvell Berlin SoCs have a system control register set providing several
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individual registers dealing with pinmux, padmux, and reset.
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Required properties:
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- compatible:
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* the first and second values must be:
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"simple-mfd", "syscon"
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- reg: address and length of the system control register set
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Example:
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chip: chip-control@ea0000 {
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compatible = "simple-mfd", "syscon";
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reg = <0xea0000 0x400>;
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/* sub-device nodes */
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};
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sysctrl: system-controller@d000 {
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compatible = "simple-mfd", "syscon";
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reg = <0xd000 0x100>;
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/* sub-device nodes */
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};
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