u-boot/doc/device-tree-bindings/serial/8250.txt
Thomas Chou 75219d57ef ns16550: replace with binding files from Linux kernel
Replace ns16550.txt with binding files from Linux kernel. As suggested
by Stephen Warren, we should keep the directory structure, filenames,
and file content identical to the bindings in the Linux kernel.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-01-25 10:40:03 -05:00

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2.2 KiB
Text

* 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"
- "ibm,qpace-nwp-serial"
- "altr,16550-FIFO32"
- "altr,16550-FIFO64"
- "altr,16550-FIFO128"
- "fsl,16550-FIFO64"
- "fsl,ns16550"
- "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.
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>;
};