linuxdebug/Documentation/devicetree/bindings/net/can/fsl,flexcan.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/net/can/fsl,flexcan.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title:
  Flexcan CAN controller on Freescale's ARM and PowerPC system-on-a-chip (SOC).

maintainers:
  - Marc Kleine-Budde <mkl@pengutronix.de>

allOf:
  - $ref: can-controller.yaml#

properties:
  compatible:
    oneOf:
      - enum:
          - fsl,imx8qm-flexcan
          - fsl,imx8mp-flexcan
          - fsl,imx6q-flexcan
          - fsl,imx28-flexcan
          - fsl,imx25-flexcan
          - fsl,p1010-flexcan
          - fsl,vf610-flexcan
          - fsl,ls1021ar2-flexcan
          - fsl,lx2160ar1-flexcan
      - items:
          - enum:
              - fsl,imx53-flexcan
              - fsl,imx35-flexcan
          - const: fsl,imx25-flexcan
      - items:
          - enum:
              - fsl,imx7d-flexcan
              - fsl,imx6ul-flexcan
              - fsl,imx6sx-flexcan
          - const: fsl,imx6q-flexcan
      - items:
          - enum:
              - fsl,ls1028ar1-flexcan
          - const: fsl,lx2160ar1-flexcan

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

  clocks:
    maxItems: 2

  clock-names:
    items:
      - const: ipg
      - const: per

  clock-frequency:
    description: |
      The oscillator frequency driving the flexcan device, filled in by the
      boot loader. This property should only be used the used operating system
      doesn't support the clocks and clock-names property.

  xceiver-supply:
    description: Regulator that powers the CAN transceiver.

  big-endian:
    $ref: /schemas/types.yaml#/definitions/flag
    description: |
      This means the registers of FlexCAN controller are big endian. This is
      optional property.i.e. if this property is not present in device tree
      node then controller is assumed to be little endian. If this property is
      present then controller is assumed to be big endian.

  fsl,stop-mode:
    description: |
      Register bits of stop mode control.

      The format should be as follows:
      <gpr req_gpr req_bit>
      gpr is the phandle to general purpose register node.
      req_gpr is the gpr register offset of CAN stop request.
      req_bit is the bit offset of CAN stop request.
    $ref: /schemas/types.yaml#/definitions/phandle-array
    items:
      - items:
          - description: The 'gpr' is the phandle to general purpose register node.
          - description: The 'req_gpr' is the gpr register offset of CAN stop request.
            maximum: 0xff
          - description: The 'req_bit' is the bit offset of CAN stop request.
            maximum: 0x1f

  fsl,clk-source:
    description: |
      Select the clock source to the CAN Protocol Engine (PE). It's SoC
      implementation dependent. Refer to RM for detailed definition. If this
      property is not set in device tree node then driver selects clock source 1
      by default.
      0: clock source 0 (oscillator clock)
      1: clock source 1 (peripheral clock)
    $ref: /schemas/types.yaml#/definitions/uint8
    default: 1
    minimum: 0
    maximum: 1

  wakeup-source:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      Enable CAN remote wakeup.

  fsl,scu-index:
    description: |
      The scu index of CAN instance.
      For SoCs with SCU support, need setup stop mode via SCU firmware, so this
      property can help indicate a resource. It supports up to 3 CAN instances
      now.
    $ref: /schemas/types.yaml#/definitions/uint8
    minimum: 0
    maximum: 2

  termination-gpios: true
  termination-ohms: true

required:
  - compatible
  - reg
  - interrupts

additionalProperties: false

examples:
  - |
    can@1c000 {
        compatible = "fsl,p1010-flexcan";
        reg = <0x1c000 0x1000>;
        interrupts = <48 0x2>;
        interrupt-parent = <&mpic>;
        clock-frequency = <200000000>;
        fsl,clk-source = /bits/ 8 <0>;
    };
  - |
    #include <dt-bindings/interrupt-controller/irq.h>

    can@2090000 {
        compatible = "fsl,imx6q-flexcan";
        reg = <0x02090000 0x4000>;
        interrupts = <0 110 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&clks 1>, <&clks 2>;
        clock-names = "ipg", "per";
        fsl,stop-mode = <&gpr 0x34 28>;
        fsl,scu-index = /bits/ 8 <1>;
    };
  - |
    #include <dt-bindings/interrupt-controller/irq.h>
    #include <dt-bindings/gpio/gpio.h>

    can@2090000 {
        compatible = "fsl,imx6q-flexcan";
        reg = <0x02090000 0x4000>;
        interrupts = <0 110 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&clks 1>, <&clks 2>;
        clock-names = "ipg", "per";
        fsl,stop-mode = <&gpr 0x34 28>;
        termination-gpios = <&gpio1 0 GPIO_ACTIVE_LOW>;
        termination-ohms = <120>;
    };