zephyr,mspi-emul-device (on mspi bus)
Vendor: Zephyr-specific binding
Description
Zephyr MSPI Emulation Device
Properties
Node specific properties
Properties not inherited from the base binding file.
Name |
Type |
Details |
|---|---|---|
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Array of parameters to configure the xip feature.
enable: whether XIP feature is enabled.
address_offset: The offset in bytes to the start of the
platform specific XIP address region.
size: The size in bytes of the XIP address region one
wish to enable or disable.
permission: The permission granted to the region. (RW/RO)
For controller that support this feature. One may map the device
memory into Soc system memory map. i.e. XIP address region
So that the device may be used as an external RAM and execute code.
default =
<
.enable = false;
.address_offset = 0;
.size = 0;
.permission = 0;
>
Default value: |
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Array of parameters to configure the scrambling feature.
enable: whether scrambling feature is enabled.
address_offset: The offset in bytes to the start address which
can be the offset to the start of the platform
specific XIP address region or phyiscal device address.
size: The size in bytes of the region one wish to enable or disable.
For controller that support hardware scrambling, one may use it for
additional security to protect data or code stored in external devices.
default =
<
.enable = false;
.address_offset = 0;
.size = 0;
>
Default value: |
|
|
Array of parameters to configure the auto CE break feature.
mem_boundary: Memory boundary in bytes of a device that a transfer
should't cross.
time_to_break: The maximum time of a transfer should't exceed for
a device in micro seconds(us).
This is typically used with devices that has memory boundaries or
requires periodic internal refresh. e.g. psram
default =
<
.mem_boundary = 0;
.time_to_break = 0;
>
Default value: |
|
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Maximum clock frequency of device to configure in Hz.
In device tree, it is normally the target operating
frequency after initialization.
This property is required. |
|
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MSPI I/O mode setting.
In device tree, it is normally the target io mode
after initialization.
Legal values: |
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MSPI data rate setting. In device tree, it is normally the target data rate after initialization.
Legal values: |
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MSPI hardware CE number.
MSPI controller may natively support multiple peripheral devices
on the same MSPI instance by assigning designated CE numbers.
|
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MSPI clock polarity setting.
MSPI_CPP_MODE_0: CPOL=0, CPHA=0
MSPI_CPP_MODE_1: CPOL=0, CPHA=1
MSPI_CPP_MODE_2: CPOL=1, CPHA=0
MSPI_CPP_MODE_3: CPOL=1, CPHA=1
Legal values: |
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MSPI transfer MSB or LSB first.
Legal values: |
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MSPI CE polarity. In most cases, it is active low.
Legal values: |
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Enable DQS mode for a device which supports it.
This will be checked against dqs-support and configure
the MSPI hardware if it supports DQS mode.
|
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In some cases, it is necessary for the controller to manage
MSPI chip enable (under software control), so that multiple
mspi transactions can be performed without releasing CE.
A typical use case is variable length MSPI packets where
the first mspi transaction reads the length and the second
mspi transaction reads length bytes.
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The number of data or clock cycles between addr and data
in RX direction.
0 means the RX dummy phase is disabled.
|
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The number of data or clock cycles between addr and data
in TX direction.
0 means the TX dummy phase is disabled.
|
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Read command to be sent in RX direction.
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Write command to be sent in RX direction.
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Length in bytes of the write and read commands.
Legal values: |
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Length in bytes of address to be sent in address phase.
Legal values: |
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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.
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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.
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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 “zephyr,mspi-emul-device” 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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