mirror of
https://github.com/torvalds/linux.git
synced 2024-12-26 12:52:30 +00:00
22a10bca28
Some regulators have a fixed load that isn't captured by consumers that the kernel knows about. Add a constraint to support this. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Mark Brown <broonie@kernel.org>
95 lines
3.7 KiB
Plaintext
95 lines
3.7 KiB
Plaintext
Voltage/Current Regulators
|
|
|
|
Optional properties:
|
|
- regulator-name: A string used as a descriptive name for regulator outputs
|
|
- regulator-min-microvolt: smallest voltage consumers may set
|
|
- regulator-max-microvolt: largest voltage consumers may set
|
|
- regulator-microvolt-offset: Offset applied to voltages to compensate for voltage drops
|
|
- regulator-min-microamp: smallest current consumers may set
|
|
- regulator-max-microamp: largest current consumers may set
|
|
- regulator-always-on: boolean, regulator should never be disabled
|
|
- regulator-boot-on: bootloader/firmware enabled regulator
|
|
- regulator-allow-bypass: allow the regulator to go into bypass mode
|
|
- <name>-supply: phandle to the parent supply/regulator node
|
|
- regulator-ramp-delay: ramp delay for regulator(in uV/uS)
|
|
For hardware which supports disabling ramp rate, it should be explicitly
|
|
intialised to zero (regulator-ramp-delay = <0>) for disabling ramp delay.
|
|
- regulator-enable-ramp-delay: The time taken, in microseconds, for the supply
|
|
rail to reach the target voltage, plus/minus whatever tolerance the board
|
|
design requires. This property describes the total system ramp time
|
|
required due to the combination of internal ramping of the regulator itself,
|
|
and board design issues such as trace capacitance and load on the supply.
|
|
- regulator-state-mem sub-root node for Suspend-to-RAM mode
|
|
: suspend to memory, the device goes to sleep, but all data stored in memory,
|
|
only some external interrupt can wake the device.
|
|
- regulator-state-disk sub-root node for Suspend-to-DISK mode
|
|
: suspend to disk, this state operates similarly to Suspend-to-RAM,
|
|
but includes a final step of writing memory contents to disk.
|
|
- regulator-state-[mem/disk] node has following common properties:
|
|
- regulator-on-in-suspend: regulator should be on in suspend state.
|
|
- regulator-off-in-suspend: regulator should be off in suspend state.
|
|
- regulator-suspend-microvolt: regulator should be set to this voltage
|
|
in suspend.
|
|
- regulator-mode: operating mode in the given suspend state.
|
|
The set of possible operating modes depends on the capabilities of
|
|
every hardware so the valid modes are documented on each regulator
|
|
device tree binding document.
|
|
- regulator-initial-mode: initial operating mode. The set of possible operating
|
|
modes depends on the capabilities of every hardware so each device binding
|
|
documentation explains which values the regulator supports.
|
|
- regulator-system-load: Load in uA present on regulator that is not captured by
|
|
any consumer request.
|
|
|
|
Deprecated properties:
|
|
- regulator-compatible: If a regulator chip contains multiple
|
|
regulators, and if the chip's binding contains a child node that
|
|
describes each regulator, then this property indicates which regulator
|
|
this child node is intended to configure. If this property is missing,
|
|
the node's name will be used instead.
|
|
|
|
Example:
|
|
|
|
xyzreg: regulator@0 {
|
|
regulator-min-microvolt = <1000000>;
|
|
regulator-max-microvolt = <2500000>;
|
|
regulator-always-on;
|
|
vin-supply = <&vin>;
|
|
|
|
regulator-state-mem {
|
|
regulator-on-in-suspend;
|
|
};
|
|
};
|
|
|
|
Regulator Consumers:
|
|
Consumer nodes can reference one or more of its supplies/
|
|
regulators using the below bindings.
|
|
|
|
- <name>-supply: phandle to the regulator node
|
|
|
|
These are the same bindings that a regulator in the above
|
|
example used to reference its own supply, in which case
|
|
its just seen as a special case of a regulator being a
|
|
consumer itself.
|
|
|
|
Example of a consumer device node (mmc) referencing two
|
|
regulators (twl_reg1 and twl_reg2),
|
|
|
|
twl_reg1: regulator@0 {
|
|
...
|
|
...
|
|
...
|
|
};
|
|
|
|
twl_reg2: regulator@1 {
|
|
...
|
|
...
|
|
...
|
|
};
|
|
|
|
mmc: mmc@0x0 {
|
|
...
|
|
...
|
|
vmmc-supply = <&twl_reg1>;
|
|
vmmcaux-supply = <&twl_reg2>;
|
|
};
|