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nxp,imx-flexspi

Vendor: NXP Semiconductors

Description

These nodes are “spi” bus nodes.

NXP FlexSPI controller

Properties

Top level properties

These property descriptions apply to “nxp,imx-flexspi” nodes themselves. This page also describes child node properties in the following sections.

Properties not inherited from the base binding file.

Name

Type

Details

ahb-bufferable

boolean

Enable AHB bufferable write access by setting register field
AHBCR[BUFFERABLEEN].

ahb-cacheable

boolean

Enable AHB cacheable read access by setting register field
AHBCR[CACHEABLEEN].

ahb-prefetch

boolean

Enable AHB read prefetch by setting register field AHBCR[PREFETCHEN].

ahb-read-addr-opt

boolean

Remove burst start address alignment limitation by setting register
field AHBCR[READADDROPT].

combination-mode

boolean

Combine port A and port B data pins to support octal mode access by
setting register field MCR0[COMBINATIONEN].

sck-differential-clock

boolean

Enable/disable SCKB pad use as SCKA differential clock output,
when enabled, Port B flash access is not available.

rx-clock-source

int

Source clock for flash read. See the RXCLKSRC field in register MCR0.
The default corresponds to the reset value of the register field.

Legal values: 0, 1, 2, 3

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.

Child node properties

Name

Type

Details

cs-interval-unit

int

Chip select interval units, in serial clock cycles. See the
CSINTERVALUNIT field in registers FLASHA1CR0 through FLASHB2CR0. The
default corresponds to the reset value of the register field.

Default value: 1

Legal values: 1, 256

cs-interval

int

Minimum interval between chip select deassertion and assertion. See the
CSINTERVAL field in registers FLASHA1CR0 through FLASHB2CR0. The
default corresponds to the reset value of the register field.

cs-setup-time

int

Chip select setup time, in serial clock cycles. See the TCSS field in
registers FLASHA1CR0 through FLASHB2CR0. The default corresponds to the
reset value of the register field.

Default value: 3

cs-hold-time

int

Chip select hold time, in serial clock cycles. See the TCSH field in
registers FLASHA1CR0 through FLASHB2CR0. The default corresponds to the
reset value of the register field.

Default value: 3

data-valid-time

int

Data valid time, in nanoseconds. See the registers DLLACR through
DLLBCR.

column-space

int

Column address bit width. Set to zero if the flash does not support
column address. See the CAS field in registers FLASHA1CR0 through
FLASHB2CR0. The default corresponds to the reset value of the register
field.

word-addressable

boolean

Don't transmit the least significant address bit when the flash is word
addressable. See the WA field in registers FLASHA1CR0 through
FLASHB2CR0.

ahb-write-wait-unit

int

AHB write wait interval units, in AHB clock cycles. See the AWRWAITUNIT
field in registers FLASHA1CR2 through FLASHB2CR2. The default
corresponds to the reset value of the register field.

Default value: 2

Legal values: 2, 8, 32, 128, 512, 2048, 8192, 32768

ahb-write-wait-interval

int

Time to wait between AHB triggered command sequences. See the AWRWAIT
field in registers FLASHA1CR2 through FLASHB2CR2. The default
corresponds to the reset value of the register field.

reg

array

register space

This property is required.

See Important properties for more information.

spi-max-frequency

int

Maximum clock frequency of device's SPI interface in Hz

This property is required.

label

string

Human readable string describing the device (used as device_get_binding() argument)

This property is required.

See Important properties for more information.

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

status

string

indicates the operational status of a device

Legal values: 'ok', 'okay', 'disabled', 'reserved', 'fail', 'fail-sss'

See Important properties for more information.

compatible

string-array

compatible strings

This property is required.

See Important properties for more information.

reg-names

string-array

name of each register space

interrupts

array

interrupts for device

See Important properties for more information.

interrupts-extended

compound

extended interrupt specifier for device

interrupt-names

string-array

name of each interrupt

interrupt-parent

phandle

phandle to interrupt controller node

clocks

phandle-array

Clock gate information

clock-names

string-array

name of each clock

#address-cells

int

number of address cells in reg property

#size-cells

int

number of size cells in reg property

dmas

phandle-array

DMA channels specifiers

dma-names

string-array

Provided names of DMA channel specifiers

io-channels

phandle-array

IO channels specifiers

io-channel-names

string-array

Provided names of IO channel specifiers

mboxes

phandle-array

mailbox / IPM channels specifiers

mbox-names

string-array

Provided names of mailbox / IPM channel specifiers

wakeup-source

boolean

Property to identify that a device can be used as wake up source.

When this property is provided a specific flag is set into the
device that tells the system that the device is capable of
wake up the system.

Wake up capable devices are disabled (interruptions will not wake up
the system) by default but they can be enabled at runtime if necessary.

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.

jedec-id

uint8-array

JEDEC ID as manufacturer ID, memory type, memory density

size

int

flash capacity in bits

sfdp-bfp

uint8-array

Contains the 32-bit words in little-endian byte order from the
JESD216 Serial Flash Discoverable Parameters Basic Flash
Parameters table.  This provides flash-specific configuration
information in cases were runtime retrieval of SFDP data
is not desired.

quad-enable-requirements

string

Quad Enable Requirements value from JESD216 BFP DW15.

Use NONE if the device detects 1-1-4 and 1-4-4 modes by the
instruction.  Use S1B6 if QE is bit 6 of the first status register
byte, and can be configured by reading then writing one byte with
RDSR and WRSR.  For other fields see the specification.

Legal values: 'NONE', 'S2B1v1', 'S1B6', 'S2B7', 'S2B1v4', 'S2B1v5', 'S2B1v6'

enter-4byte-addr

int

Enter 4-Byte Addressing value from JESD216 BFP DW16

This property is ignored if the device is configured to use SFDP data
from the sfdp-bfp property (CONFIG_SPI_NOR_SFDP_DEVICETREE) or to read
SFDP properties at runtime (CONFIG_SPI_NOR_SFDP_RUNTIME).

For CONFIG_SPI_NOR_SFDP_MINIMAL this is the 8-bit value from bits 31:24
of DW16 identifying ways a device can be placed into 4-byte addressing
mode.  If provided as a non-zero value the driver assumes that 4-byte
addressing is require to access the full address range, and
automatically puts the device into 4-byte address mode when the device
is initialized.