Devicetree CAN API

Macros
#define	DT_CAN_TRANSCEIVER_MIN_BITRATE(node_id, min)
	Get the minimum transceiver bitrate for a CAN controller.
#define	DT_CAN_TRANSCEIVER_MAX_BITRATE(node_id, max)
	Get the maximum transceiver bitrate for a CAN controller.
#define	DT_INST_CAN_TRANSCEIVER_MIN_BITRATE(inst, min)    DT_CAN_TRANSCEIVER_MIN_BITRATE(DT_DRV_INST(inst), min)
	Get the minimum transceiver bitrate for a DT_DRV_COMPAT CAN controller.
#define	DT_INST_CAN_TRANSCEIVER_MAX_BITRATE(inst, max)    DT_CAN_TRANSCEIVER_MAX_BITRATE(DT_DRV_INST(inst), max)
	Get the maximum transceiver bitrate for a DT_DRV_COMPAT CAN controller.

Detailed Description

Macro Definition Documentation

DT_CAN_TRANSCEIVER_MAX_BITRATE

#define DT_CAN_TRANSCEIVER_MAX_BITRATE	(		node_id,
			max
	)

#include <zephyr/devicetree/can.h>

Value:

        COND_CODE_1(DT_NODE_HAS_PROP(node_id, phys),                                    \
                    MIN(DT_PROP(DT_PHANDLE(node_id, phys), max_bitrate), max),          \
                    MIN(DT_PROP_OR(DT_CHILD(node_id, can_transceiver), max_bitrate, max), max))

Get the maximum transceiver bitrate for a CAN controller.

The bitrate will be limited to the maximum bitrate supported by the CAN controller. If no CAN transceiver is present in the devicetree, the maximum bitrate will be that of the CAN controller.

Example devicetree fragment:

transceiver0: can-phy0 {
        compatible = "vnd,can-transceiver";
        max-bitrate = <1000000>;
        #phy-cells = <0>;
};

can0: can@... {
        compatible = "vnd,can-controller";
        phys = <&transceiver0>;
};

can1: can@... {
        compatible = "vnd,can-controller";

        can-transceiver {
                max-bitrate = <2000000>;
        };
};

Example usage:

DT_CAN_TRANSCEIVER_MAX_BITRATE(DT_NODELABEL(can0), 5000000) // 1000000
DT_CAN_TRANSCEIVER_MAX_BITRATE(DT_NODELABEL(can1), 5000000) // 2000000
DT_CAN_TRANSCEIVER_MAX_BITRATE(DT_NODELABEL(can1), 1000000) // 1000000

Parameters

node_id	node identifier
max	maximum bitrate supported by the CAN controller

Returns

the maximum bitrate supported by the CAN controller/transceiver combination

DT_CAN_TRANSCEIVER_MIN_BITRATE

#define DT_CAN_TRANSCEIVER_MIN_BITRATE	(		node_id,
			min
	)

#include <zephyr/devicetree/can.h>

Value:

        COND_CODE_1(DT_NODE_HAS_PROP(node_id, phys),                                    \
                    MAX(DT_PROP_OR(DT_PHANDLE(node_id, phys), min_bitrate, 0), min),    \
                    MAX(DT_PROP_OR(DT_CHILD(node_id, can_transceiver), min_bitrate, min), min))

Get the minimum transceiver bitrate for a CAN controller.

The bitrate will be limited to the minimum bitrate supported by the CAN controller. If no CAN transceiver is present in the devicetree, the minimum bitrate will be that of the CAN controller.

Example devicetree fragment:

transceiver0: can-phy0 {
        compatible = "vnd,can-transceiver";
        min-bitrate = <15000>;
        max-bitrate = <1000000>;
        #phy-cells = <0>;
};

can0: can@... {
        compatible = "vnd,can-controller";
        phys = <&transceiver0>;
};

can1: can@... {
        compatible = "vnd,can-controller";

        can-transceiver {
                min-bitrate = <25000>;
                max-bitrate = <2000000>;
        };
};

can2: can@... {
        compatible = "vnd,can-controller";

        can-transceiver {
                max-bitrate = <2000000>;
        };
};

Example usage:

DT_CAN_TRANSCEIVER_MIN_BITRATE(DT_NODELABEL(can0), 10000) // 15000
DT_CAN_TRANSCEIVER_MIN_BITRATE(DT_NODELABEL(can1), 0)     // 250000
DT_CAN_TRANSCEIVER_MIN_BITRATE(DT_NODELABEL(can1), 50000) // 500000
DT_CAN_TRANSCEIVER_MIN_BITRATE(DT_NODELABEL(can2), 0)     // 0

Parameters

node_id	node identifier
min	minimum bitrate supported by the CAN controller

Returns

the minimum bitrate supported by the CAN controller/transceiver combination

DT_INST_CAN_TRANSCEIVER_MAX_BITRATE

#define DT_INST_CAN_TRANSCEIVER_MAX_BITRATE	(		inst,
			max
	)		DT_CAN_TRANSCEIVER_MAX_BITRATE(DT_DRV_INST(inst), max)

#include <zephyr/devicetree/can.h>

Get the maximum transceiver bitrate for a DT_DRV_COMPAT CAN controller.

Parameters

inst	DT_DRV_COMPAT instance number
max	maximum bitrate supported by the CAN controller

Returns

the maximum bitrate supported by the CAN controller/transceiver combination

See also

DT_CAN_TRANSCEIVER_MAX_BITRATE()

DT_INST_CAN_TRANSCEIVER_MIN_BITRATE

#define DT_INST_CAN_TRANSCEIVER_MIN_BITRATE	(		inst,
			min
	)		DT_CAN_TRANSCEIVER_MIN_BITRATE(DT_DRV_INST(inst), min)

#include <zephyr/devicetree/can.h>

Get the minimum transceiver bitrate for a DT_DRV_COMPAT CAN controller.

Parameters

inst	DT_DRV_COMPAT instance number
min	minimum bitrate supported by the CAN controller

Returns

the minimum bitrate supported by the CAN controller/transceiver combination

See also

DT_CAN_TRANSCEIVER_MIN_BITRATE()