nuvoton,npcx-fiu-nor (on qspi bus)
Vendor: Nuvoton Technology Corporation
Note
An implementation of a driver matching this compatible is available in drivers/flash/flash_npcx_fiu_nor.c.
Description
The SPI NOR flash devices accessed by Nuvoton Flash Interface Unit (FIU).
Representation of a SPI NOR flash on a qspi bus looks like:
int_flash: w25q40@0 {
compatible ="nuvoton,npcx-fiu-nor";
size = <DT_SIZE_K(512 * 8)>;
reg = <0>;
qspi-flags = <NPCX_QSPI_SW_CS1>;
mapped-addr = <0x64000000>;
pinctrl-0 = <&int_flash_sl>;
pinctrl-names = "default";
};
Properties
Node specific properties
Properties not inherited from the base binding file.
Name |
Type |
Details |
|---|---|---|
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Mapped memory address of direct read access for spi nor flash.
This property is required. |
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Typically, it equals to max timeout of chip erase in ms.
Default value: |
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The definitions for configuring the Quad-SPI peripherals.
This property is required. |
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Selects the SPI read access type of Direct Read Access. Usually, we choose
Fast Read Dual I/O mode for better performance. If the nor spi flash does
not support this mode, please set this property explicitly.
Default value: Legal values: |
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Pin configuration/s for the first state. Content is specific to the
selected pin controller driver implementation.
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Pin configuration/s for the second state. See pinctrl-0.
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Pin configuration/s for the third state. See pinctrl-0.
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Pin configuration/s for the fourth state. See pinctrl-0.
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Pin configuration/s for the fifth state. See pinctrl-0.
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Names for the provided states. The number of names needs to match the
number of states.
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Indicates the device requires the ULBPR (0x98) command.
Some flash chips such as the Microchip SST26VF series have a block
protection register that initializes to write-protected. Use this
property to indicate that the BPR must be unlocked before write
operations can proceed.
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Indicates the device supports the DPD (0xB9) command.
Use this property to indicate the flash chip supports the Deep
Power-Down mode that is entered by command 0xB9 to reduce power
consumption below normal standby levels. Use of this property
implies that the RDPD (0xAB) Release from Deep Power Down command
is also supported. (On some chips this command functions as Read
Electronic Signature; see t-enter-dpd).
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Specifies wakeup durations for devices without RDPD.
Some devices (Macronix MX25R in particular) wake from deep power
down by a timed sequence of CSn toggles rather than the RDPD
command. This property specifies three durations measured in
nanoseconds, in this order:
(1) tDPDD (Delay Time for Release from Deep Power-Down Mode)
(2) tCDRP (CSn Toggling Time before Release from Deep Power-Down Mode)
(3) tRDP (Recovery Time for Release from Deep Power-Down Mode)
Absence of this property indicates that the RDPD command should be
used to wake the chip from Deep Power-Down mode.
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Duration required to complete the DPD command.
This provides the duration, in nanoseconds, that CSn must be
remain deasserted after issuing DPD before the chip will enter
deep power down.
If not provided the driver does not enforce a delay.
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Duration required to complete the RDPD command.
This provides the duration, in nanoseconds, that CSn must be
remain deasserted after issuing RDPD before the chip will exit
deep power down and be ready to receive additional commands.
If not provided the driver does not enforce a delay.
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Bit mask of bits of the status register that should be cleared on
startup.
Some devices from certain vendors power-up with block protect bits
set in the status register, which prevent any erase or program
operation from working. Devices that have this behavior need to
clear those bits on startup. However, other devices have
non-volatile bits in the status register that should not be
cleared.
This value, when present, identifies bits in the status register
that should be cleared when the device is initialized.
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Select to configure flash to use ultra low power mode or high performance mode (L/H switch). The high performance mode has faster write and erase performance, but use more power than ultra low power mode.
Only supported on Macronix MX25R Ultra Low Power series.
Legal values: |
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JEDEC ID as manufacturer ID, memory type, memory density
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flash capacity in bits
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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.
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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: |
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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.
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Number of bytes in a page from JESD216 BFP DW11
This property is only used in the CONFIG_SPI_NOR_SFDP_MINIMAL configuration.
It is ignored if the device is configured to use SFDP data
from the sfdp-bfp property (CONFIG_SPI_NOR_SFDP_DEVICETREE) or
if the SFDP parameters are read from the device at
runtime (CONFIG_SPI_NOR_SFDP_RUNTIME).
The default value is 256 bytes if the value is not specified.
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Deprecated node specific properties
Deprecated properties not inherited from the base binding file.
(None)
Base properties
Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “nuvoton,npcx-fiu-nor” compatible.
Name |
Type |
Details |
|---|---|---|
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register space
This property is required. See Important properties for more information. |
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indicates the operational status of a device
Legal values: See Important properties for more information. |
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compatible strings
This property is required. See Important properties for more information. |
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name of each register space
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interrupts for device
See Important properties for more information. |
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extended interrupt specifier for device
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name of each interrupt
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phandle to interrupt controller node
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Human readable string describing the device (used as device_get_binding() argument)
See Important properties for more information. This property is deprecated. |
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Clock gate information
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name of each clock
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number of address cells in reg property
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number of size cells in reg property
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DMA channels specifiers
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Provided names of DMA channel specifiers
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IO channels specifiers
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Provided names of IO channel specifiers
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mailbox / IPM channels specifiers
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Provided names of mailbox / IPM channel specifiers
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Power domain specifiers
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Provided names of power domain specifiers
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Number of cells in power-domains property
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Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
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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.
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Automatically configure the device for runtime power management after the
init function runs.
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List of power states that will disable this device power.
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