68 lines
2.5 KiB
Plaintext
68 lines
2.5 KiB
Plaintext
Bosch MCAN controller Device Tree Bindings
|
|
-------------------------------------------------
|
|
|
|
Required properties:
|
|
- compatible : Should be "bosch,m_can" for M_CAN controllers
|
|
- reg : physical base address and size of the M_CAN
|
|
registers map and Message RAM
|
|
- reg-names : Should be "m_can" and "message_ram"
|
|
- interrupts : Should be the interrupt number of M_CAN interrupt
|
|
line 0 and line 1, could be same if sharing
|
|
the same interrupt.
|
|
- interrupt-names : Should contain "int0" and "int1"
|
|
- clocks : Clocks used by controller, should be host clock
|
|
and CAN clock.
|
|
- clock-names : Should contain "hclk" and "cclk"
|
|
- pinctrl-<n> : Pinctrl states as described in bindings/pinctrl/pinctrl-bindings.txt
|
|
- pinctrl-names : Names corresponding to the numbered pinctrl states
|
|
- bosch,mram-cfg : 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.
|
|
|
|
Example:
|
|
SoC dtsi:
|
|
m_can1: can@020e8000 {
|
|
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>;
|
|
status = "disabled";
|
|
};
|
|
|
|
Board dts:
|
|
&m_can1 {
|
|
pinctrl-names = "default";
|
|
pinctrl-0 = <&pinctrl_m_can1>;
|
|
status = "enabled";
|
|
};
|