xref: /openbmc/linux/Documentation/devicetree/bindings/reset/reset.txt (revision e5451c8f8330e03ad3cfa16048b4daf961af434f)

= Reset Signal Device Tree Bindings =

This binding is intended to represent the hardware reset signals present
internally in most IC (SoC, FPGA, ...) designs. Reset signals for whole
standalone chips are most likely better represented as GPIOs, although there
are likely to be exceptions to this rule.

Hardware blocks typically receive a reset signal. This signal is generated by
a reset provider (e.g. power management or clock module) and received by a
reset consumer (the module being reset, or a module managing when a sub-
ordinate module is reset). This binding exists to represent the provider and
consumer, and provide a way to couple the two together.

A reset signal is represented by the phandle of the provider, plus a reset
specifier - a list of DT cells that represents the reset signal within the
provider. The length (number of cells) and semantics of the reset specifier
are dictated by the binding of the reset provider, although common schemes
are described below.

A word on where to place reset signal consumers in device tree: It is possible
in hardware for a reset signal to affect multiple logically separate HW blocks
at once. In this case, it would be unwise to represent this reset signal in
the DT node of each affected HW block, since if activated, an unrelated block
may be reset. Instead, reset signals should be represented in the DT node
where it makes most sense to control it; this may be a bus node if all
children of the bus are affected by the reset signal, or an individual HW
block node for dedicated reset signals. The intent of this binding is to give
appropriate software access to the reset signals in order to manage the HW,
rather than to slavishly enumerate the reset signal that affects each HW
block.

= Reset providers =

Required properties:
#reset-cells:	Number of cells in a reset specifier; Typically 0 for nodes
		with a single reset output and 1 for nodes with multiple
		reset outputs.

For example:

	rst: reset-controller {
		#reset-cells = <1>;
	};

= Reset consumers =

Required properties:
resets:		List of phandle and reset specifier pairs, one pair
		for each reset signal that affects the device, or that the
		device manages. Note: if the reset provider specifies '0' for
		#reset-cells, then only the phandle portion of the pair will
		appear.

Optional properties:
reset-names:	List of reset signal name strings sorted in the same order as
		the resets property. Consumers drivers will use reset-names to
		match reset signal names with reset specifiers.

For example:

	device {
		resets = <&rst 20>;
		reset-names = "reset";
	};

This represents a device with a single reset signal named "reset".

	bus {
		resets = <&rst 10> <&rst 11> <&rst 12> <&rst 11>;
		reset-names = "i2s1", "i2s2", "dma", "mixer";
	};

This represents a bus that controls the reset signal of each of four sub-
ordinate devices. Consider for example a bus that fails to operate unless no
child device has reset asserted.