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microchip,mcp251xfd (on spi bus)

Vendor: Microchip Technology Inc.

Description

Microchip MCP251XFD SPI CAN FD controller

The MCP251XFD node is defined on an SPI bus. An example
configuration is:

&mikrobus_spi {
    cs-gpios = <&mikrobus_header 2 GPIO_ACTIVE_LOW>;

    mcp2518fd_mikroe_mcp2518fd_click: mcp2518fd@0 {
        compatible = "microchip,mcp251xfd";
        status = "okay";

        spi-max-frequency = <18000000>;
        int-gpios = <&mikrobus_header 7 GPIO_ACTIVE_LOW>;
        reg = <0x0>;
        osc-freq = <40000000>;

    };
};

Properties

Top level properties

These property descriptions apply to “microchip,mcp251xfd” nodes themselves. This page also describes child node properties in the following sections.

Node specific propertiesDeprecated node specific propertiesBase properties

Properties not inherited from the base binding file.

Name	Type	Details
supply-gpios	phandle-array	GPIO specifier that controls power to the device. This property should be provided when the device has a dedicated switch that controls power to the device. The supply state is entirely the responsibility of the device driver. Contrast with vin-supply.
vin-supply	phandle	Reference to the regulator that controls power to the device. The referenced devicetree node must have a regulator compatible. This property should be provided when device power is supplied by a shared regulator. The supply state is dependent on the request status of all devices fed by the regulator. Contrast with supply-gpios. If both properties are provided then the regulator must be requested before the supply GPIOS is set to an active state, and the supply GPIOS must be set to an inactive state before releasing the regulator.
spi-max-frequency	int	Maximum clock frequency of device's SPI interface in Hz This property is required.
duplex	int	Duplex mode, full or half. By default it's always full duplex thus 0 as this is, by far, the most common mode. Use the macros not the actual enum value, here is the concordance list (see dt-bindings/spi/spi.h) 0 SPI_FULL_DUPLEX 2048 SPI_HALF_DUPLEX Legal values: 0, 2048
frame-format	int	Motorola or TI frame format. By default it's always Motorola's, thus 0 as this is, by far, the most common format. Use the macros not the actual enum value, here is the concordance list (see dt-bindings/spi/spi.h) 0 SPI_FRAME_FORMAT_MOTOROLA 32768 SPI_FRAME_FORMAT_TI Legal values: 0, 32768
spi-cpol	boolean	SPI clock polarity which indicates the clock idle state. If it is used, the clock idle state is logic high; otherwise, low.
spi-cpha	boolean	SPI clock phase that indicates on which edge data is sampled. If it is used, data is sampled on the second edge; otherwise, on the first edge.
spi-hold-cs	boolean	In some cases, it is necessary for the master to manage SPI chip select under software control, so that multiple spi transactions can be performed without releasing it. A typical use case is variable length SPI packets where the first spi transaction reads the length and the second spi transaction reads length bytes.
bitrate	int	Initial bitrate in bit/s. If this is unset, the initial bitrate is set to CONFIG_CAN_DEFAULT_BITRATE.
sample-point	int	Initial sample point in per mille (e.g. 875 equals 87.5%). If this is unset (or if it is set to 0), the initial sample point will default to 75.0% for bitrates over 800 kbit/s, 80.0% for bitrates over 500 kbit/s, and 87.5% for all other bitrates.
phys	phandle	Actively controlled CAN transceiver. Example: transceiver0: can-phy0 { compatible = "nxp,tja1040", "can-transceiver-gpio"; standby-gpios = <gpioa 0 GPIO_ACTIVE_HIGH>; max-bitrate = <1000000>; #phy-cells = <0>; }; &can0 { status = "okay"; phys = <&transceiver0>; };
bitrate-data	int	Initial data phase bitrate in bit/s. If this is unset, the initial data phase bitrate is set to CONFIG_CAN_DEFAULT_BITRATE_DATA.
sample-point-data	int	Initial data phase sample point in per mille (e.g. 875 equals 87.5%). If this is unset (or if it is set to 0), the initial sample point will default to 75.0% for bitrates over 800 kbit/s, 80.0% for bitrates over 500 kbit/s, and 87.5% for all other bitrates.
osc-freq	int	Frequency of the external oscillator in Hz. This property is required.
int-gpios	phandle-array	The interrupt signal from the controller is active low in push-pull mode. The property value should ensure the flags properly describe the signal that is presented to the driver. This property is required.
pll-enable	boolean	Enables controller PLL, which multiplies input clock frequency by 10. This parameter also implicitly sets whether the clock is from the PLL output or directly from the oscillator. If this option is enabled the clock source is the PLL, otherwise its the oscillator.
timestamp-prescaler	int	Prescaler value for computing the timestamps of received messages. The timestamp counter is derived from the internal clock divided by this value. Valid range is [1, 1024]. Default value: 1
sof-on-clko	boolean	Output start-of-frame (SOF) signal on the CLKO pin every time a Start bit of a CAN message is transmitted or received. If this option is not set, then an internal clock (typically 40MHz or 20MHz) will be output on CLKO pin instead.
clko-div	int	The factor to divide the system clock for CLKO pin. Default value: 10 Legal values: 1, 2, 4, 10

Child node properties

Name	Type	Details
min-bitrate	int	The minimum bitrate supported by the CAN transceiver in bits/s.
max-bitrate	int	The maximum bitrate supported by the CAN transceiver in bits/s. This property is required.