silabs,gecko-pinctrl
Vendor: Silicon Laboratories
Description
The Silabs pin controller is a singleton node responsible for controlling
pin function selection and pin properties. For example, you can use this
node to route UART0 RX to pin P0.1 and enable the pull-up resistor on the
pin.
The node has the 'pinctrl' node label set in your SoC's devicetree,
so you can modify it like this:
&pinctrl {
/* your modifications go here */
};
All device pin configurations should be placed in child nodes of the
'pinctrl' node, as shown in this example:
/* You can put this in places like a board-pinctrl.dtsi file in
* your board directory, or a devicetree overlay in your application.
*/
&pinctrl {
/* configuration for usart0 device, default state */
usart0_default: usart0_default {
/* group 1 ('group1' name is arbitrary) */
group1 {
/* configure P0.1 as UART_TX and P0.2 as UART_RTS */
psels = <GECKO_PSEL(UART_TX, A, 1)>, <GECKO_PSEL(UART_RTS, A, 2)>;
};
/* group 2 */
group2 {
/* configure P0.3 as UART_RX and P0.4 as UART_CTS */
psels = <GECKO_PSEL(UART_RX, A, 3)>, <GECKO_PSEL(UART_CTS, A, 4)>;
};
};
};
The 'usart0_default' child node encodes the pin configurations for a
particular state of a device; in this case, the default (that is, active)
state. You would specify the low-power configuration for the same device
in a separate child node.
As shown, pin configurations are organized in groups within each child node.
Each group can specify a list of pin function selections in the 'psels'
property. The GECKO_PSEL macro is used to specify a pin function selection.
Available pin functions can be found in the
include/dt-bindings/pinctrl/gecko-pinctrl.h header file.
To link this pin configuration with a device, use a pinctrl-N property
for some number N, like this example you could place in your board's DTS
file:
#include "board-pinctrl.dtsi"
&usart0 {
pinctrl-0 = <&usart0_default>;
pinctrl-names = "default";
};
Properties
Top level properties
These property descriptions apply to “silabs,gecko-pinctrl” nodes themselves. This page also describes child node properties in the following sections.
Node specific properties
Properties not inherited from the base binding file.
(None)
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 “silabs,gecko-pinctrl” compatible.
Name |
Type |
Details |
|---|---|---|
|
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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
|
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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. |
|
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Clock gate information
|
|
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name of each clock
|
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number of address cells in reg property
|
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number of size cells in reg property
|
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DMA channels specifiers
|
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Provided names of DMA channel specifiers
|
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IO channels specifiers
|
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Provided names of IO channel specifiers
|
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mailbox / IPM channels specifiers
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Provided names of mailbox / IPM channel specifiers
|
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Power domain specifiers
|
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Provided names of power domain specifiers
|
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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.
|
|
|
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.
|
Child node properties
Name |
Type |
Details |
|---|---|---|
|
|
disable any pin bias
|
|
|
high impedance mode ("third-state", "floating")
|
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latch weakly
|
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enable pull-up resistor
|
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enable pull-down resistor
|
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use pin's default pull state
|
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drive actively high and low
|
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drive with open drain (hardware AND)
|
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drive with open source (hardware OR)
|
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maximum sink or source current in mA
|
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maximum sink or source current in μA
|
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enable input on pin (e.g. enable an input buffer, no effect on output)
|
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disable input on pin (e.g. disable an input buffer, no effect on output)
|
|
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enable schmitt-trigger mode
|
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disable schmitt-trigger mode
|
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Takes the debounce time in μsec, as argument or 0 to disable debouncing
|
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select between different power supplies
|
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enable low power mode
|
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disable low power mode
|
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disable output on a pin (e.g. disable an output buffer)
|
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enable output on a pin without actively driving it (e.g. enable an output
buffer)
|
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set the pin to output mode with low level
|
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set the pin to output mode with high level
|
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indicate this is sleep related state which will be programmed into
the registers for the sleep state
|
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set the slew rate
|
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|
This affects the expected clock skew on input pins and the delay
before latching a value to an output pin. Typically indicates how
many double-inverters are used to delay the signal.
|
Grandchild node properties
Name |
Type |
Details |
|---|---|---|
|
|
An array of pins sharing the same group properties. The pins should
be defined using the GECKO_PSEL utility macro that encodes the port,
pin and function.
This property is required. |