Bosch MCAN controller Device Tree Bindings
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Required properties:
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- compatible : Should be "bosch,m_can" for M_CAN controllers
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- reg : physical base address and size of the M_CAN
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registers map and Message RAM
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- reg-names : Should be "m_can" and "message_ram"
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- interrupts : Should be the interrupt number of M_CAN interrupt
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line 0 and line 1, could be same if sharing
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the same interrupt.
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- interrupt-names : Should contain "int0" and "int1"
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- clocks : Clocks used by controller, should be host clock
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and CAN clock.
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- clock-names : Should contain "hclk" and "cclk"
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- pinctrl-<n> : Pinctrl states as described in bindings/pinctrl/pinctrl-bindings.txt
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- pinctrl-names : Names corresponding to the numbered pinctrl states
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- bosch,mram-cfg : Message RAM configuration data.
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Multiple M_CAN instances can share the same Message
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RAM and each element(e.g Rx FIFO or Tx Buffer and etc)
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number in Message RAM is also configurable,
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so this property is telling driver how the shared or
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private Message RAM are used by this M_CAN controller.
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The format should be as follows:
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<offset sidf_elems xidf_elems rxf0_elems rxf1_elems
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rxb_elems txe_elems txb_elems>
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The 'offset' is an address offset of the Message RAM
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where the following elements start from. This is
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usually set to 0x0 if you're using a private Message
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RAM. The remain cells are used to specify how many
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elements are used for each FIFO/Buffer.
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M_CAN includes the following elements according to user manual:
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11-bit Filter 0-128 elements / 0-128 words
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29-bit Filter 0-64 elements / 0-128 words
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Rx FIFO 0 0-64 elements / 0-1152 words
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Rx FIFO 1 0-64 elements / 0-1152 words
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Rx Buffers 0-64 elements / 0-1152 words
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Tx Event FIFO 0-32 elements / 0-64 words
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Tx Buffers 0-32 elements / 0-576 words
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Please refer to 2.4.1 Message RAM Configuration in
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Bosch M_CAN user manual for details.
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Optional Subnode:
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- can-transceiver : Can-transceiver subnode describing maximum speed
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that can be used for CAN/CAN-FD modes. See
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Documentation/devicetree/bindings/net/can/can-transceiver.txt
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for details.
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Example:
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SoC dtsi:
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m_can1: can@20e8000 {
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compatible = "bosch,m_can";
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reg = <0x020e8000 0x4000>, <0x02298000 0x4000>;
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reg-names = "m_can", "message_ram";
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interrupts = <0 114 0x04>,
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<0 114 0x04>;
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interrupt-names = "int0", "int1";
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clocks = <&clks IMX6SX_CLK_CANFD>,
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<&clks IMX6SX_CLK_CANFD>;
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clock-names = "hclk", "cclk";
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bosch,mram-cfg = <0x0 0 0 32 0 0 0 1>;
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};
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Board dts:
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&m_can1 {
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pinctrl-names = "default";
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pinctrl-0 = <&pinctrl_m_can1>;
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status = "enabled";
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can-transceiver {
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max-bitrate = <5000000>;
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};
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};
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