nordic,nrf-sw-pwm
Vendor: Nordic Semiconductor
Note
An implementation of a driver matching this compatible is available in drivers/pwm/pwm_nrf_sw.c.
Description
nRFx S/W PWM
Properties
Properties not inherited from the base binding file.
Name |
Type |
Details |
|---|---|---|
|
|
Reference to TIMER or RTC instance for generating PWM output signals
This property is required. |
|
|
Clock prescaler for RTC or TIMER used for generating PWM output signals.
RTC: needs to be set to 0, which gives 32768 Hz base clock for PWM
generation.
TIMER: 16 MHz / 2^prescaler base clock is used for PWM generation.
This property is required. |
|
|
An array of GPIOs assigned as outputs for the PWM channels. The number
of items in this array determines the number of channels that this PWM
will provide. This value is limited by the number of compare registers
in the used RTC/TIMER instance minus 1.
Example:
sw_pwm: sw-pwm {
compatible = "nordic,nrf-sw-pwm";
...
channel-gpios = <&gpio0 20 GPIO_ACTIVE_HIGH>,
<&gpio1 12 GPIO_ACTIVE_HIGH>;
...
};
The above will assign P0.20 as the output for channel 0 and P1.12 as
the output for channel 1. Both outputs will be initially configured as
active high.
Please note that in the flags cell (the last component of each item
of the array) only the GPIO flags that specify the active level are
taken into account (any others are ignored), and they are used only
when the initial (inactive) state of the outputs is set.
After any PWM signal generation is requested for a given channel,
the polarity of its output is determined by the flag specified
in the request, i.e. PWM_POLARITY_INVERTED or PWM_POLARITY_NORMAL.
This property is required. |
|
|
Number of items to expect in a pwm specifier
This property is required. Constant value: |
Deprecated properties not inherited from the base binding file.
(None)
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 “nordic,nrf-sw-pwm” compatible.
Name |
Type |
Details |
|---|---|---|
|
|
indicates the operational status of a device
Legal values: See Important properties for more information. |
|
|
compatible strings
This property is required. See Important properties for more information. |
|
|
register space
See Important properties for more information. |
|
|
name of each register space
|
|
|
interrupts for device
See Important properties for more information. |
|
|
extended interrupt specifier for device
|
|
|
name of each interrupt
|
|
|
phandle to interrupt controller node
|
|
|
Human readable string describing the device (used as device_get_binding() argument)
See Important properties for more information. This property is deprecated. |
|
|
Clock gate information
|
|
|
name of each clock
|
|
|
number of address cells in reg property
|
|
|
number of size cells in reg property
|
|
|
DMA channels specifiers
|
|
|
Provided names of DMA channel specifiers
|
|
|
IO channels specifiers
|
|
|
Provided names of IO channel specifiers
|
|
|
mailbox / IPM channels specifiers
|
|
|
Provided names of mailbox / IPM channel specifiers
|
|
|
Power domain specifiers
|
|
|
Provided names of power domain specifiers
|
|
|
Number of cells in power-domains property
|
|
|
Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
|
|
|
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.
|
|
|
Automatically configure the device for runtime power management after the
init function runs.
|
|
|
List of power states that will disable this device power.
|
Specifier cell names
pwm cells: channel, period, flags