* System Controller Registers R/W driver
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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 for
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some other node's driver, or platform-specific code, to acquire a
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reference to the syscon node (e.g. by phandle, node path, or search
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using a specific compatible value), interrogate the node (or associated
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OS driver) to determine the location of the registers, and access the
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registers directly.
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Required properties:
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- compatible: Should contain "syscon".
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- reg: the register region can be accessed from syscon
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Optional property:
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- reg-io-width: the size (in bytes) of the IO accesses that should be
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performed on the device.
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- hwlocks: reference to a phandle of a hardware spinlock provider node.
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Examples:
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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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hwlock1: hwspinlock@40500000 {
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...
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reg = <0x40500000 0x1000>;
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#hwlock-cells = <1>;
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};
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