espressif,esp32-spi
Vendor: Espressif Systems
Note
An implementation of a driver matching this compatible is available in drivers/spi/spi_esp32_spim.c.
Description
These nodes are “spi” bus nodes.
ESP32 SPI
Properties
Node specific properties
Properties not inherited from the base binding file.
Name |
Type |
Details |
|---|---|---|
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Pin configuration/s for the first state. Content is specific to the
selected pin controller driver implementation.
This property is required. |
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Names for the provided states. The number of names needs to match the
number of states.
This property is required. |
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Enable half-duplex communication mode.
Transmit data before receiving it, instead of simultaneously
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Enable dummy SPI compensation cycles
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Enable 3-wire mode
Use MOSI for both sending and receiving data
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Enable SPI DMA support
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DMA clock source
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DMA Host - 0 -> SPI2, 1 -> SPI3
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Support to toggle the CS while the clock toggles
Output clock on CS line if CS is active
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Make CS positive during a transaction instead of negative
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Some pins are allowed to bypass the GPIO Matrix and use the IO_MUX
routing mechanism instead, this avoids extra routing latency and makes
possible the use of operating frequencies higher than 20 MHz.
Refer to SoC's Technical Reference Manual to check which pins are
allowed to use this routing path.
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Chip select setup time setting, see TRF for SOC for details of
timing applied.
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Chip select hold time setting, see TRF for SOC for details of
timing applied.
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Default MISO and MOSI pins GPIO level when idle. Defaults to high by default.
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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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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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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 “espressif,esp32-spi” compatible.
Name |
Type |
Details |
|---|---|---|
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register space
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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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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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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