71c3e4c369
Add generic devicetree bindings for simple CAN transceivers. Always-on CAN transceivers are considered passive and just provide a maximum supported bitrate. Active CAN controllers can typically be controlled by the MCU via either SPI, I2C, or GPIO. Common GPIO controlled CAN transceivers provide either a stand-by or an enable pin (or both) for controlling the state of the CAN transceiver. Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
72 lines
1.7 KiB
YAML
72 lines
1.7 KiB
YAML
# Common fields for CAN controllers
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include: base.yaml
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properties:
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bus-speed:
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type: int
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required: true
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description: bus speed in Baud/s
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sjw:
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type: int
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required: true
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description: Resynchronization jump width (ISO 11898-1)
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prop-seg:
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type: int
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required: false
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description: Time quantums of propagation segment (ISO 11898-1)
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phase-seg1:
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type: int
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required: false
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description: Time quantums of phase buffer 1 segment (ISO 11898-1)
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phase-seg2:
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type: int
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required: false
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description: Time quantums of phase buffer 2 segment (ISO 11898-1)
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sample-point:
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type: int
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required: false
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description: >
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Sample point in permille.
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This param is required if segments are not given.
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If the sample point is given, the segments are ignored.
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phys:
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type: phandle
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required: false
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description: |
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Actively controlled CAN transceiver.
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Example:
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transceiver0: can-phy0 {
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compatible = "nxp,tja1040", "can-transceiver-gpio";
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standby-gpios = <gpioa 0 GPIO_ACTIVE_HIGH>;
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max-bitrate = <1000000>;
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#phy-cells = <0>;
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};
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&can0 {
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status = "okay";
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phys = <&transceiver0>;
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};
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child-binding:
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description: |
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Passive CAN transceiver. The child node must be named "can-transceiver".
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Example:
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&can0 {
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status = "okay";
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can-transceiver {
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max-bitrate = <1000000>;
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};
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};
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properties:
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max-bitrate:
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type: int
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required: true
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description: |
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The maximum bitrate supported by the CAN transceiver in bits/s.
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