elan,em32-pwm
Description
ELAN EM32F967 PWM Controller
The EM32F967 features a dedicated 6-channel PWM controller with:
- 6 independent PWM channels (PWMA through PWMF)
- Complementary outputs (P and N) for each channel
- Programmable dead-time insertion with 4-level prescaler
- Flexible pin multiplexing (PA0-5 or PB10-15)
Pin Assignments:
- Port A (use-port-a = true, PWM_S=0):
PA0: PWMA_P, PA1: PWMA_N
PA2: PWMB_P, PA3: PWMB_N
PA4: PWMC_P, PA5: PWMC_N
- Port B (use-port-a = false, PWM_S=1):
PB10: PWMA_P, PB11: PWMA_N
PB12: PWMB_P, PB13: PWMB_N
PB14: PWMC_P, PB15: PWMC_N
Output Type:
- 0 (PWM_EM32_OUTPUT_P): P output only
- 1 (PWM_EM32_OUTPUT_N): N output only
- 2 (PWM_EM32_OUTPUT_BOTH): Both P and N outputs
Example usage for PWMB_N on PA3:
&pwm0 {
status = "okay";
use-port-a;
output-type = <1>; /* N output only */
pinctrl-0 = <&pwmb_pa3_n>;
pinctrl-names = "default";
};
Properties
Properties not inherited from the base binding file.
Name |
Type |
Details |
|---|---|---|
|
|
Number of cells in a PWM specifier:
- channel: PWM channel number (0-5 for PWMA-PWMF)
- period: PWM period in nanoseconds
- flags: PWM flags (e.g., PWM_POLARITY_INVERTED)
Constant value: |
|
|
Use Port A pins (PA0-PA5) for PWM output instead of Port B (PB10-PB15).
When true, sets IP_Share[18] (PWM_S) = 0 for PA pins.
When false or not specified, sets PWM_S = 1 for PB pins.
|
|
|
PWM output type selection:
0 = P output only (default)
1 = N output only (complementary output, e.g., for PA3 PWMB_N)
2 = Both P and N outputs (complementary pair with dead-time)
|
|
|
Pin configuration/s for the first state. Content is specific to the
selected pin controller driver implementation.
|
|
|
Pin configuration/s for the second state. See pinctrl-0.
|
|
|
Pin configuration/s for the third state. See pinctrl-0.
|
|
|
Pin configuration/s for the fourth state. See pinctrl-0.
|
|
|
Pin configuration/s for the fifth state. See pinctrl-0.
|
|
|
Names for the provided states. The number of names needs to match the
number of states.
|
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 “elan,em32-pwm” compatible.
Name |
Type |
Details |
|---|---|---|
|
|
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. |
|
|
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
This property is required. |
|
|
Interrupt lines for each PWM channel.
Order: PWMA, PWMB, PWMC, PWMD, PWME, PWMF
See Important properties for more information. |
|
|
Names for the interrupt lines.
Should be: "pwma", "pwmb", "pwmc", "pwmd", "pwme", "pwmf"
|
|
|
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. |
|
|
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. |
|
|
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"
|
|
|
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.
|
|
|
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.
|
|
|
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. |
|
|
Optional names given to each clock provider in the "clocks" property.
|
|
|
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.
|
|
|
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.
|
|
|
DMA channel specifiers relevant to the device.
|
|
|
Optional names given to the DMA channel specifiers in the "dmas" property.
|
|
|
IO channel specifiers relevant to the device.
|
|
|
Optional names given to the IO channel specifiers in the "io-channels" property.
|
|
|
Mailbox / IPM channel specifiers relevant to the device.
|
|
|
Optional names given to the mbox specifiers in the "mboxes" property.
|
|
|
Power domain specifiers relevant to the device.
|
|
|
Optional names given to the power domain specifiers in the "power-domains" property.
|
|
|
Number of cells in power-domains property
|
|
|
HW spinlock id relevant to the device.
|
|
|
Optional names given to the hwlock specifiers in the "hwlocks" 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