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* UART (Universal Asynchronous Receiver/Transmitter)
Required properties:
- compatible : one of:
- "ns8250"
- "ns16450"
- "ns16550a"
- "ns16550"
- "ns16750"
- "ns16850"
- For Tegra20, must contain "nvidia,tegra20-uart"
- For other Tegra, must contain '"nvidia,<chip>-uart",
"nvidia,tegra20-uart"' where <chip> is tegra30, tegra114, tegra124,
tegra132, or tegra210.
- "nxp,lpc3220-uart"
- "ralink,rt2880-uart"
- For MediaTek BTIF, must contain '"mediatek,<chip>-btif",
"mediatek,mtk-btif"' where <chip> is mt7622, mt7623.
- "altr,16550-FIFO32"
- "altr,16550-FIFO64"
- "altr,16550-FIFO128"
- "fsl,16550-FIFO64"
- "fsl,ns16550"
- "intel,xscale-uart"
- "ti,da830-uart"
- "aspeed,ast2400-vuart"
- "aspeed,ast2500-vuart"
- "nuvoton,npcm750-uart"
- "serial" if the port type is unknown.
- reg : offset and length of the register set for the device.
- interrupts : should contain uart interrupt.
- clock-frequency : the input clock frequency for the UART
or
clocks phandle to refer to the clk used as per Documentation/devicetree
/bindings/clock/clock-bindings.txt
Optional properties:
- current-speed : the current active speed of the UART.
- reg-offset : offset to apply to the mapbase from the start of the registers.
- reg-shift : quantity to shift the register offsets by.
- reg-io-width : the size (in bytes) of the IO accesses that should be
performed on the device. There are some systems that require 32-bit
accesses to the UART (e.g. TI davinci).
- used-by-rtas : set to indicate that the port is in use by the OpenFirmware
RTAS and should not be registered.
- no-loopback-test: set to indicate that the port does not implements loopback
test mode
- fifo-size: the fifo size of the UART.
- auto-flow-control: one way to enable automatic flow control support. The
driver is allowed to detect support for the capability even without this
property.
- tx-threshold: Specify the TX FIFO low water indication for parts with
programmable TX FIFO thresholds.
- resets : phandle + reset specifier pairs
- overrun-throttle-ms : how long to pause uart rx when input overrun is encountered.
Note:
* fsl,ns16550:
------------
Freescale DUART is very similar to the PC16552D (and to a
pair of NS16550A), albeit with some nonstandard behavior such as
erratum A-004737 (relating to incorrect BRK handling).
Represents a single port that is compatible with the DUART found
on many Freescale chips (examples include mpc8349, mpc8548,
mpc8641d, p4080 and ls2085a).
Example:
uart@80230000 {
compatible = "ns8250";
reg = <0x80230000 0x100>;
clock-frequency = <3686400>;
interrupts = <10>;
reg-shift = <2>;
};
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