# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/mfd/syscon.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: System Controller Registers R/W Device Tree Bindings
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description: |
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System controller node represents a register region containing a set
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of miscellaneous registers. The registers are not cohesive enough to
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represent as any specific type of device. The typical use-case is
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for some other node's driver, or platform-specific code, to acquire
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a reference to the syscon node (e.g. by phandle, node path, or
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search using a specific compatible value), interrogate the node (or
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associated OS driver) to determine the location of the registers,
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and access the registers directly.
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maintainers:
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- Lee Jones <lee.jones@linaro.org>
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select:
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properties:
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compatible:
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contains:
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enum:
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- syscon
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required:
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- compatible
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properties:
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compatible:
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anyOf:
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- items:
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- enum:
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- allwinner,sun8i-a83t-system-controller
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- allwinner,sun8i-h3-system-controller
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- allwinner,sun8i-v3s-system-controller
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- allwinner,sun50i-a64-system-controller
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- hisilicon,dsa-subctrl
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- hisilicon,hi6220-sramctrl
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- hisilicon,pcie-sas-subctrl
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- hisilicon,peri-subctrl
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- microchip,sparx5-cpu-syscon
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- mstar,msc313-pmsleep
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- samsung,exynos3-sysreg
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- samsung,exynos4-sysreg
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- samsung,exynos5-sysreg
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- samsung,exynos5433-sysreg
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- const: syscon
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- contains:
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const: syscon
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minItems: 2
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maxItems: 4 # Should be enough
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reg:
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maxItems: 1
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reg-io-width:
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description: |
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The size (in bytes) of the IO accesses that should be performed
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on the device.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [1, 2, 4, 8]
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hwlocks:
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maxItems: 1
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description:
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Reference to a phandle of a hardware spinlock provider node.
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required:
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- compatible
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- reg
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additionalProperties: true
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examples:
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- |
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syscon: syscon@1c00000 {
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compatible = "allwinner,sun8i-h3-system-controller", "syscon";
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reg = <0x01c00000 0x1000>;
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};
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- |
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gpr: iomuxc-gpr@20e0000 {
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compatible = "fsl,imx6q-iomuxc-gpr", "syscon";
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reg = <0x020e0000 0x38>;
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hwlocks = <&hwlock1 1>;
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};
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...
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