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st,stm32-qspi-nor (on qspi bus)

Vendor: STMicroelectronics

Description

STM32 QSPI Flash controller supporting the JEDEC CFI interface

Representation of a serial flash on a quadspi bus:

    mx25r6435f: qspi-nor-flash@0 {
            compatible = "st,stm32-qspi-nor";
            label = "MX25R6435F";
            reg = <0>;
            qspi-max-frequency = <80000000>;
            size = <0x4000000>;
            reset-gpios = <&gpiod 3 GPIO_ACTIVE_LOW>;
            reset-gpios-duration = <1>;
            spi-bus-width = <4>;
            status = "okay";
    };

Properties

Properties not inherited from the base binding file.

Name

Type

Details

qspi-max-frequency

int

Maximum clock frequency of device's QSPI interface in Hz

This property is required.

size

int

Flash Memory size in bits

This property is required.

reset-gpios

phandle-array

RESETn pin

reset-gpios-duration

int

The duration (in ms) for the flash memory reset pulse

spi-bus-width

int

The width of (Q)SPI bus to which flash memory is connected. Now only value of 4 (when using SIO[0123]) is supported.

writeoc

string

The value encodes number of I/O lines used for the opcode,
address, and data.

There is no info about quad page program opcodes in the SFDP
tables, hence it has been assumed that NOR flash memory
supporting 1-4-4 mode also would support fast page programming.

If absent, then 1-4-4 program page is used in quad mode.

Legal values: 'PP_1_1_4', 'PP_1_4_4'

jedec-id

uint8-array

JEDEC ID as manufacturer ID, memory type, memory density

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.