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nordic,nrf-spim

Vendor: Nordic Semiconductor

Description

These nodes are “spi” bus nodes.

Nordic nRF family SPIM (SPI master with EasyDMA)

Properties

Properties not inherited from the base binding file.

Name

Type

Details

miso-pull-up

boolean

Enable pull-up on MISO line

miso-pull-down

boolean

Enable pull-down on MISO line

anomaly-58-workaround

boolean

Enables the workaround for the nRF52832 SoC SPIM PAN 58 anomaly.
Must be used in conjunction with
CONFIG_SOC_NRF52832_ALLOW_SPIM_DESPITE_PAN_58=y

rx-delay-supported

boolean

Indicates if the SPIM instance has the capability of delaying MISO
sampling. This property needs to be defined at SoC level DTS files.

rx-delay

int

Number of 64 MHz clock cycles (15.625 ns) delay from the sampling edge
of SCK (leading or trailing, depending on the CPHA setting used) until
the input serial data on MISO is actually sampled. This property does
not have any effect if the rx-delay-supported property is not set.

Legal values: 0, 1, 2, 3, 4, 5, 6, 7

max-frequency

int

Maximum data rate the SPI peripheral can be driven at, in Hz. This
property must be set at SoC level DTS files.

This property is required.

overrun-character

int

The overrun character (ORC) is used when all bytes from the TX buffer
are sent, but the transfer continues due to RX. Defaults to 0xff
(line high), the most common value used in SPI transfers.

Default value: 255

clock-frequency

int

Clock frequency the SPI peripheral is being driven at, in Hz.

cs-gpios

phandle-array

An array of chip select GPIOs to use. Each element
in the array specifies a GPIO. The index in the array
corresponds to the child node that the CS gpio controls.

Example:

  spi@... {
          cs-gpios = <&gpio0 23 GPIO_ACTIVE_LOW>,
                        <&gpio1 10 GPIO_ACTIVE_LOW>,
                        ...;

          spi-device@0 {
                  reg = <0>;
                  ...
          };
          spi-device@1 {
                  reg = <1>;
                  ...
          };
          ...
  };

The child node "spi-device@0" specifies a SPI device with
chip select controller gpio0, pin 23, and devicetree
GPIO flags GPIO_ACTIVE_LOW. Similarly, "spi-device@1" has CS GPIO
controller gpio1, pin 10, and flags GPIO_ACTIVE_LOW. Additional
devices can be configured in the same way.

If unsure about the flags cell, GPIO_ACTIVE_LOW is generally a safe
choice for a typical "CSn" pin. GPIO_ACTIVE_HIGH may be used if
intervening hardware inverts the signal to the peripheral device or
the line itself is active high.

If this property is not defined, no chip select GPIOs are set.
SPI controllers with dedicated CS pins do not need to define
the cs-gpios property.

pinctrl-0

phandles

Pin configuration/s for the first state. Content is specific to the
selected pin controller driver implementation.

pinctrl-1

phandles

Pin configuration/s for the second state. See pinctrl-0.

pinctrl-2

phandles

Pin configuration/s for the third state. See pinctrl-0.

pinctrl-3

phandles

Pin configuration/s for the fourth state. See pinctrl-0.

pinctrl-4

phandles

Pin configuration/s for the fifth state. See pinctrl-0.

pinctrl-names

string-array

Names for the provided states. The number of names needs to match the
number of states.

memory-regions

phandle-array

List of memory region phandles

memory-region-names

string-array

A list of names, one for each corresponding phandle in memory-region