infineon,xmc4xxx-uart
Vendor: Infineon Technologies
Description
These nodes are “uart” bus nodes.
INFINEON XMC4XXX UART
Properties
Properties not inherited from the base binding file.
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Type |
Details |
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Clock frequency information for UART operation
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Initial baud rate setting for UART
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Set to enable RTS/CTS flow control at boot time
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Configures the parity of the adapter. Enumeration id 0 for none, 1 for odd
and 2 for even parity. Default to none if not specified.
Legal values: |
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Sets the number of stop bits.
Legal values: |
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Sets the number of data bits.
Legal values: |
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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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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.
This property is required. |
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Connects the UART receive line (USIC DX0 input) to a specific GPIO pin.
The USIC DX0 input is a multiplexer which connects to different GPIO pins.
Refer to the XMC4XXX reference manual for the GPIO pin/mux mappings. DX0G
is the loopback input line.
This property is required. Legal values: |
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Each USIC0..2 has a fifo that is shared between two channels. For example,
usic0ch0 and usic0ch1 will share the same fifo. This parameter defines an offset
where the tx and rx fifos will start. When sharing the fifo, the user must properly
define the offset based on the configuration of the other channel. The fifo has a
capacity of 64 entries. The tx/rx fifos are created on fifo-xx-size aligned
boundaries.
This property is required. |
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Fifo size used for buffering transmit bytes. A value of 0 implies that
the fifo is not used while transmitting. transmitting. If the UART is used in async mode
then fifo-tx-size should be set to 0.
This property is required. Legal values: |
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Fifo size used for buffering received bytes. A value of 0 implies that
the fifo is not used while receiving. If the UART is used in async mode
then fifo-rx-size should be set to 0.
This property is required. Legal values: |
Deprecated properties not inherited from the base binding file.
(None)
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 “infineon,xmc4xxx-uart” compatible.
Name |
Type |
Details |
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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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Power domain the device belongs to.
The device will be notified when the power domain it belongs to is either
suspended or resumed.
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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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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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register space
This property is required. See Important properties for more information. |
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name of each register space
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IRQ number and priority to use for interrupt driven UART.
USIC0..2 have their own interrupt range as follows:
USIC0 = [84, 89]
USIC1 = [90, 95]
USIC2 = [96, 101]
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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Optional TX & RX dma specifiers used by async UART.
The dmas are referenced in the UART node using the following syntax:
dmas = <&dma1 1 0 XMC4XXX_SET_CONFIG(10,6)>, <&dma1 2 0 XMC4XXX_SET_CONFIG(11,6)>;
where the first entry is for the TX, and the second for RX.
The parameters in the dma entry are: dma device phandle, dma channel, dma priority (0 is
lowest and 7 is highest), and an opaque entry for the dma line routing parameters set
by the macro XMC4XXX_SET_CONFIG(line, request_source). Use the following steps to properly
select parameters line, request_source:
1. Select a dma device and a free dma channel.
1. Select a free dma line. dma0 device can only connect to lines [0, 7] and
dma1 can connect to lines [8, 11].
2. For a given interrupt, calculate the service request (SR) number. Note the following
simple mapping: in USIC0 interrupt 84->SR0, interrupt 85->SR1, ... etc.
In USIC1, interrupt 90->SR0, 91->SR1, etc.
3. Select request_source from Table "DMA Request Source Selection" in XMC4XXX reference
manual.
For example, say we select interrupt 85 on USIC0, dma0, channel 3, priority 4, and line 7.
The interrupt would map to SR1. From Table "DMA Request Source Selection", request_source
would need to be set to 10 and the dts entry would be:
dma = <&dma0 3 4 XMC4XXX_SET_CONFIG(7,10) ... >;
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Required if the dmas property exists. Should be set to "tx" and "rx"
to match the dmas property.
For example
dma-names = "tx", "rx";
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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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Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
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