xlnx,xps-spi-2.00.a
Vendor: Xilinx
Note
An implementation of a driver matching this compatible is available in drivers/spi/spi_xlnx_axi_quadspi.c.
Description
These nodes are “spi” bus nodes.
Xilinx AXI Quad SPI IP node
Properties
Node specific properties
Properties not inherited from the base binding file.
Name |
Type |
Details |
|---|---|---|
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Number of slave select bits implemented
This property is required. Legal values: |
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Number of bits per transfer
This property is required. Legal values: |
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Indicates the core is instantiated with the STARTUP block option, as is
typically used when interfacing with the FPGA's configuration flash
device. In this configuration the SPI clock is routed through the
STARTUP block rather than normal signal routing.
In this case, a workaround is required to issue a dummy
transaction to the SPI flash device to ensure the STARTUP block is
disengaged and allow the SPI core to control the CCLK line properly.
The dummy READ_ID transaction will be issued to chip select 0.
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FIFO size configured in SPI core. 0 indicates no FIFO.
If not specified, 0 is assumed.
Used to optimize TX/RX read handling. If the FIFO size is 0, the driver
will check for FIFO full/empty after every word.
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Clock frequency the SPI peripheral is being driven at, in Hz.
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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.
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The overrun character (ORC) is used when all bytes from the TX buffer
are sent, but the transfer continues due to RX.
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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 “xlnx,xps-spi-2.00.a” compatible.
Name |
Type |
Details |
|---|---|---|
|
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register space
This property is required. See Important properties for more information. |
|
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interrupts for device
This property is required. See Important properties for more information. |
|
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number of address cells in reg property
This property is required. Constant value: |
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number of size cells in reg property
This property is required. |
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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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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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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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