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renesas,rcar-pfc
Vendor: Renesas Electronics Corporation
Description
Renesas R-Car Pin Function Controller node
This binding gives a base representation of the R-Car pins configuration.
The R-Car pin controller is a singleton node responsible for controlling
pin function selection and pin properties. For example, you can use this
node to route CAN0 TX A to pin 'RD', and enable pull-up resistor as well
as driving ability.
The node has the 'pfc' node label set in your SoC's devicetree, so you can
modify it like this:
&pfc {
/* your modifications go here */
};
All device pin configurations should be placed in child nodes of the
'pfc' 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.
*/
/* include pre-defined pins and functions for the SoC used by the board */
#include <dt-bindings/pinctrl/renesas/pinctrl-r8a77951.h>
&pfc {
/* configuration for can0 data a tx default state */
can0_data_a_tx_default: can0_data_a_tx_default {
/* configure PIN_RD as FUNC_CAN0_TX_A */
pin = <PIN_RD FUNC_CAN0_TX_A>;
};
/* configuration for can0 data a rx default state */
can0_data_a_rx_default: can0_data_a_rx_default {
/* configure PIN_RD_WR as FUNC_CAN0_RX_A */
pin = <PIN_RD_WR FUNC_CAN0_RX_A>;
};
};
The 'can0_data_a_tx_default' child node encodes the pin configurations
for a particular state of a device; in this case, the default
(that is, active) sate. You would specify the low-power configuration for
the same device in a separate child node.
A pin configuration can also specify pin properties such as the
'bias-pull-up' property. Here is a list of supported standard pin
properties:
- bias-disable
- bias-pull-down
- bias-pull-up
- drive-strength
To link pin configurations 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"
&can0 {
pinctrl-0 = <&can0_data_a_tx_default &can0_data_a_rx_default>;
pinctrl-1 = <&can0_data_a_tx_sleep &can0_data_a_rx_sleep>;
pinctrl-names = "default", "sleep";
};
Properties
Top level properties
These property descriptions apply to “renesas,rcar-pfc” nodes themselves. This page also describes child node properties in the following sections.
Properties not inherited from the base binding file.
(None)
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 “renesas,rcar-pfc” compatible.
Name |
Type |
Details |
|---|---|---|
|
|
register space
This property is required. See Important properties for more information. |
|
|
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. |
|
|
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. |
|
|
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
|
|
|
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.
|
|
|
Power domain the device belongs to.
The device will be notified when the power domain it belongs to is either
suspended or resumed.
|
Child node properties
Name |
Type |
Details |
|---|---|---|
|
|
The array is expected to have up to two elements. The first element is
the pin the second optional element is the pin function.
This property is required. |
|
|
maximum sink or source current in mA
Legal values: |
|
|
disable any pin bias
|
|
|
enable pull-up resistor
|
|
|
enable pull-down resistor
|