st,stm32wb0-pwr
Vendor: STMicroelectronics N.V.
Description
STM32WB0 power controller
Properties
Top level properties
These property descriptions apply to “st,stm32wb0-pwr” nodes themselves. This page also describes child node properties in the following sections.
Node specific properties
Properties not inherited from the base binding file.
Name |
Type |
Details |
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SMPS mode selection
OFF:
- SMPS converter disabled
- LDOs supply voltage: VDD
WARNING: The SMPS must not be disabled on board using the
'SMPS supply configuration', so this mode should NEVER be
selected on these boards. Only use this mode if your board
is using the 'NOSMPS supply configuration'.
Refer to RM0505 §5.5 "SMPS step down regulator" for details.
PRECHARGE: (also called BYPASS)
- SMPS converter enabled - clock disabled
- LDOs supply voltage: VDD (though SMPS)
- Current supplied to LDOs can be limited
(feature only supported on STM32WB05 / STM32WB09)
RUN: (also called ON)
- SMPS converter enabled - clock enabled
- LDOs supply voltage: regulated SMPS output
- Target output voltage can be programmed
This property is required. Legal values: |
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SMPS L/C BOM selection
Indicates which L/C BOM is present on the board:
1: 1.5µH inductance, 2.2µF output capacitance
2: 2.2µH inductance, 4.7µF output capacitance
3: 10µH inductance, 4.7µF output capacitance
Refer to RM0505 §5.5 for more details about L/C BOM.
This property is required if `smps-mode` is not "OFF".
Legal values: |
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SMPS clock prescaler factor
The SMPS clock, CLK_SMPS, comes from a 16 MHz source that
goes through one of two prescalers, with a respective
division factor of 2 and 4. This property selects which
prescaler should be used.
Setting this property to 2 results in CLK_SMPS = 8 MHz.
Setting this property to 4 results in CLK_SMPS = 4 MHz.
All features of the SMPS can be used regardless of which
prescaler has been chosen. Since a slower clock results
in less power consumption, this property defaults to 4.
This property is only used if `smps-mode` is not "OFF".
Default value: Legal values: |
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Floating SMPS output in low-power state
If this property is set, the SMPS output pin (VFBSD)
is left floating when the SoC is in low-power state.
If this property is not set, the SMPS is placed in
PRECHARGE mode when the SoC is in low-power state.
(i.e., VFBSD voltage is equal to VDD)
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SMPS output current limit (in mA)
The default value of 20 mA corresponds to the maximal
output current allowed for the SMPS, and is also equal
to the hardware reset configuration.
On STM32WB06 and STM32WB07, this property is ignored as
the output current limitation feature is not available.
This property is only used if `smps-mode` is "PRECHARGE".
Default value: Legal values: |
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SMPS regulated output voltage
The default value corresponds to the hardware reset
configuration of 1.40V regulated output.
This property is only used if `smps-mode` is "RUN".
Default value: Legal values: |
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Max nbr of system wake-up pins.
For example wkup-pins-nb = <8>; on the stm32u5
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Number of wake-up GPIO sources to select from for each wake-up pin.
If not specified, that means there is only 1 GPIO source for each
wake-up pin.
For example, each wake-up pin on STM32U5 is associated with
4 wake-up sources, 3 of them correspond to GPIOs.
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True if SoC has a wake-up pins polarity config register
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True if SoC has pull-up/down config register(s) for GPIO ports
that are associated with wake-up pins.
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Deprecated node specific properties
Deprecated properties not inherited from the base binding file.
(None)
Base properties
Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “st,stm32wb0-pwr” compatible.
Name |
Type |
Details |
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Information used to address the device. The value is specific to
the device (i.e. is different depending on the compatible
property).
The "reg" property is typically a sequence of (address, length) pairs.
Each pair is called a "register block". Values are
conventionally written in hex.
For details, see "2.3.6 reg" in Devicetree Specification v0.4.
This property is required. See Important properties for more information. |
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This property encodes the number of <u32> cells used by address fields
in "reg" properties in this node's children.
For details, see "2.3.5 #address-cells and #size-cells" in Devicetree
Specification v0.4.
Constant value: |
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This property encodes the number of <u32> cells used by size fields in
"reg" properties in this node's children.
For details, see "2.3.5 #address-cells and #size-cells" in Devicetree
Specification v0.4.
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Indicates the operational status of the hardware or other
resource that the node represents. In particular:
- "okay" means the resource is operational and, for example,
can be used by device drivers
- "disabled" means the resource is not operational and the system
should treat it as if it is not present
For details, see "2.3.4 status" in Devicetree Specification v0.4.
Legal values: See Important properties for more information. |
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This property is a list of strings that essentially define what
type of hardware or other resource this devicetree node
represents. Each device driver checks for specific compatible
property values to find the devicetree nodes that represent
resources that the driver should manage.
The recommended format is "vendor,device", The "vendor" part is
an abbreviated name of the vendor. The "device" is usually from
the datasheet.
The compatible property can have multiple values, ordered from
most- to least-specific. Having additional values is useful when the
device is a specific instance of a more general family, to allow the
system to match the most specific driver available.
For details, see "2.3.1 compatible" in Devicetree Specification v0.4.
This property is required. See Important properties for more information. |
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Optional names given to each register block in the "reg" property.
For example:
/ {
soc {
#address-cells = <1>;
#size-cells = <1>;
uart@1000 {
reg = <0x1000 0x2000>, <0x3000 0x4000>;
reg-names = "foo", "bar";
};
};
};
The uart@1000 node has two register blocks:
- one with base address 0x1000, size 0x2000, and name "foo"
- another with base address 0x3000, size 0x4000, and name "bar"
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Information about interrupts generated by the device, encoded as an array
of one or more interrupt specifiers. The format of the data in this property
varies by where the device appears in the interrupt tree. Devices with the same
"interrupt-parent" will use the same format in their interrupts properties.
For details, see "2.4 Interrupts and Interrupt Mapping" in
Devicetree Specification v0.4.
See Important properties for more information. |
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Extended interrupt specifier for device, used as an alternative to
the "interrupts" property.
For details, see "2.4 Interrupts and Interrupt Mapping" in
Devicetree Specification v0.4.
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Optional names given to each interrupt generated by a device.
The interrupts themselves are defined in either "interrupts" or
"interrupts-extended" properties.
For details, see "2.4 Interrupts and Interrupt Mapping" in
Devicetree Specification v0.4.
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If present, this refers to the node which handles interrupts generated
by this device.
For details, see "2.4 Interrupts and Interrupt Mapping" in
Devicetree Specification v0.4.
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Human readable string describing the device. Use of this property is
deprecated except as needed on a case-by-case basis.
For details, see "4.1.2 Miscellaneous Properties" in Devicetree
Specification v0.4.
See Important properties for more information. |
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Information about the device's clock providers. In general, this property
should follow conventions established in the dt-schema binding:
https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/clock/clock.yaml
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Optional names given to each clock provider in the "clocks" property.
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DMA channel specifiers relevant to the device.
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Optional names given to the DMA channel specifiers in the "dmas" property.
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IO channel specifiers relevant to the device.
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Optional names given to the IO channel specifiers in the "io-channels" property.
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Mailbox / IPM channel specifiers relevant to the device.
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Optional names given to the mbox specifiers in the "mboxes" property.
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Power domain specifiers relevant to the device.
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Optional names given to the power domain specifiers in the "power-domains" property.
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Number of cells in power-domains property
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Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
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Property to identify that a device can be used as wake up source.
When this property is provided a specific flag is set into the
device that tells the system that the device is capable of
wake up the system.
Wake up capable devices are disabled (interruptions will not wake up
the system) by default but they can be enabled at runtime if necessary.
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Automatically configure the device for runtime power management after the
init function runs.
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List of power states that will disable this device power.
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Child node properties
Name |
Type |
Details |
|---|---|---|
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Wake-up pin identifier, same as "index" in node name
This property is required. See Important properties for more information. |
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Specifies the GPIOs, if any, that are associated with the wake-up pin.
For example, for GPIO B2 associated with wakeup source 1 on wake-up
pin 1 on STM32U5 SoCs:
wkup-gpios = <&gpiob 2 STM32_PWR_WKUP_PIN_SRC_1>, <...>;
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