# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/net/can/bosch,m_can.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Bosch MCAN controller
description: Bosch MCAN controller for CAN bus
maintainers:
- Chandrasekar Ramakrishnan <[email protected]>
allOf:
- $ref: can-controller.yaml#
properties:
compatible:
const: bosch,m_can
reg:
items:
- description: M_CAN registers map
- description: message RAM
reg-names:
items:
- const: m_can
- const: message_ram
interrupts:
items:
- description: interrupt line0
- description: interrupt line1
minItems: 1
interrupt-names:
items:
- const: int0
- const: int1
minItems: 1
clocks:
items:
- description: peripheral clock
- description: bus clock
clock-names:
items:
- const: hclk
- const: cclk
bosch,mram-cfg:
description: |
Message RAM configuration data.
Multiple M_CAN instances can share the same Message RAM
and each element(e.g Rx FIFO or Tx Buffer and etc) number
in Message RAM is also configurable, so this property is
telling driver how the shared or private Message RAM are
used by this M_CAN controller.
The format should be as follows:
<offset sidf_elems xidf_elems rxf0_elems rxf1_elems rxb_elems txe_elems txb_elems>
The 'offset' is an address offset of the Message RAM where
the following elements start from. This is usually set to
0x0 if you're using a private Message RAM. The remain cells
are used to specify how many elements are used for each FIFO/Buffer.
M_CAN includes the following elements according to user manual:
11-bit Filter 0-128 elements / 0-128 words
29-bit Filter 0-64 elements / 0-128 words
Rx FIFO 0 0-64 elements / 0-1152 words
Rx FIFO 1 0-64 elements / 0-1152 words
Rx Buffers 0-64 elements / 0-1152 words
Tx Event FIFO 0-32 elements / 0-64 words
Tx Buffers 0-32 elements / 0-576 words
Please refer to 2.4.1 Message RAM Configuration in Bosch
M_CAN user manual for details.
$ref: /schemas/types.yaml#/definitions/int32-array
items:
- description: The 'offset' is an address offset of the Message RAM where
the following elements start from. This is usually set to 0x0 if
you're using a private Message RAM.
default: 0
- description: 11-bit Filter 0-128 elements / 0-128 words
minimum: 0
maximum: 128
- description: 29-bit Filter 0-64 elements / 0-128 words
minimum: 0
maximum: 64
- description: Rx FIFO 0 0-64 elements / 0-1152 words
minimum: 0
maximum: 64
- description: Rx FIFO 1 0-64 elements / 0-1152 words
minimum: 0
maximum: 64
- description: Rx Buffers 0-64 elements / 0-1152 words
minimum: 0
maximum: 64
- description: Tx Event FIFO 0-32 elements / 0-64 words
minimum: 0
maximum: 32
- description: Tx Buffers 0-32 elements / 0-576 words
minimum: 0
maximum: 32
minItems: 1
power-domains:
description:
Power domain provider node and an args specifier containing
the can device id value.
maxItems: 1
can-transceiver:
$ref: can-transceiver.yaml#
phys:
maxItems: 1
access-controllers:
minItems: 1
maxItems: 2
required:
- compatible
- reg
- reg-names
- clocks
- clock-names
- bosch,mram-cfg
unevaluatedProperties: false
examples:
- |
// Example with interrupts
#include <dt-bindings/clock/imx6sx-clock.h>
can@20e8000 {
compatible = "bosch,m_can";
reg = <0x020e8000 0x4000>, <0x02298000 0x4000>;
reg-names = "m_can", "message_ram";
interrupts = <0 114 0x04>, <0 114 0x04>;
interrupt-names = "int0", "int1";
clocks = <&clks IMX6SX_CLK_CANFD>,
<&clks IMX6SX_CLK_CANFD>;
clock-names = "hclk", "cclk";
bosch,mram-cfg = <0x0 0 0 32 0 0 0 1>;
can-transceiver {
max-bitrate = <5000000>;
};
};
- |
// Example with timer polling
#include <dt-bindings/clock/imx6sx-clock.h>
can@20e8000 {
compatible = "bosch,m_can";
reg = <0x020e8000 0x4000>, <0x02298000 0x4000>;
reg-names = "m_can", "message_ram";
clocks = <&clks IMX6SX_CLK_CANFD>,
<&clks IMX6SX_CLK_CANFD>;
clock-names = "hclk", "cclk";
bosch,mram-cfg = <0x0 0 0 32 0 0 0 1>;
can-transceiver {
max-bitrate = <5000000>;
};
};
...
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