telink,b91-pinctrl¶

Description¶

The Telink B91 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 TX to pin PB2 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.
   */

  /* include pre-defined pins and functions for the SoC used by the board */
  #include <dt-bindings/pinctrl/b91-pinctrl.h>

  &pinctrl {
    /* configuration for UART0 TX default state */
    uart0_tx_pb2_default: uart0_tx_pb2_default {
      /* configure PB2 as B91_FUNC_C */
      pinmux = <B91_PINMUX_SET(B91_PORT_B, B91_PIN_2, B91_FUNC_C)>;
    };
    /* configuration for UART0 RX default state */
    uart0_rx_pb3_default: uart0_rx_pb3_default {
      /* configure PB2 as B91_FUNC_C */
      pinmux = <B91_PINMUX_SET(B91_PORT_B, B91_PIN_3, B91_FUNC_C)>;
    };
  };

The 'uart0_tx_pb2_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

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"

  &uart0 {
    pinctrl-0 = <&uart0_tx_pb2_default &uart0_rx_pb3_default>;
    pinctrl-1 = <&uart0_tx_pb2_sleep &uart0_rx_pb3_sleep>;
    pinctrl-names = "default", "sleep";
  };

Properties¶

Top level properties¶

These property descriptions apply to “telink,b91-pinctrl” nodes themselves. This page also describes child node properties in the following sections.

Properties not inherited from the base binding file.

Name

Type

Details

pad-mul-sel

int

PinMux pad_mul_sel register value. Pin functions depend on it.

For instance:
Function C of PB2 configs the pin to UART0_TX if pad_mul_sel is set to <1>.
But, the same function configs the same pin to DAC_I_DAT2_I if pad_mul_sel is set to <0>.

Refer to the Telink TLSR9 specs to get more information about pins configuration.

This property is required.

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 “telink,b91-pinctrl” compatible.

Name	Type	Details
`reg`	`array`	register space This property is required. See Important properties for more information.
`label`	`string`	Human readable string describing the device (used as device_get_binding() argument) This property is required. See Important properties for more information.
`status`	`string`	indicates the operational status of a device Legal values: `'ok'`, `'okay'`, `'disabled'`, `'reserved'`, `'fail'`, `'fail-sss'` See Important properties for more information.
`compatible`	`string-array`	compatible strings This property is required. See Important properties for more information.
`reg-names`	`string-array`	name of each register space
`interrupts`	`array`	interrupts for device See Important properties for more information.
`interrupts-extended`	`compound`	extended interrupt specifier for device
`interrupt-names`	`string-array`	name of each interrupt
`interrupt-parent`	`phandle`	phandle to interrupt controller node
`clocks`	`phandle-array`	Clock gate information
`clock-names`	`string-array`	name of each clock
`#address-cells`	`int`	number of address cells in reg property
`#size-cells`	`int`	number of size cells in reg property
`dmas`	`phandle-array`	DMA channels specifiers
`dma-names`	`string-array`	Provided names of DMA channel specifiers
`io-channels`	`phandle-array`	IO channels specifiers
`io-channel-names`	`string-array`	Provided names of IO channel specifiers
`mboxes`	`phandle-array`	mailbox / IPM channels specifiers
`mbox-names`	`string-array`	Provided names of mailbox / IPM channel specifiers
`wakeup-source`	`boolean`	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`	`phandle`	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
`pinmux`	`int`	Telink B91 pin's configuration (port, pin and function). This property is required.
`bias-disable`	`boolean`	disable any pin bias
`bias-pull-up`	`boolean`	enable pull-up resistor
`bias-pull-down`	`boolean`	enable pull-down resistor