Based on kernel version 3.19. Page generated on 2015-02-13 21:19 EST.
1 * UART (Universal Asynchronous Receiver/Transmitter) 2 3 Required properties: 4 - compatible : one of: 5 - "ns8250" 6 - "ns16450" 7 - "ns16550a" 8 - "ns16550" 9 - "ns16750" 10 - "ns16850" 11 - "nvidia,tegra20-uart" 12 - "nxp,lpc3220-uart" 13 - "ralink,rt2880-uart" 14 - "ibm,qpace-nwp-serial" 15 - "altr,16550-FIFO32" 16 - "altr,16550-FIFO64" 17 - "altr,16550-FIFO128" 18 - "fsl,16550-FIFO64" 19 - "serial" if the port type is unknown. 20 - reg : offset and length of the register set for the device. 21 - interrupts : should contain uart interrupt. 22 - clock-frequency : the input clock frequency for the UART 23 or 24 clocks phandle to refer to the clk used as per Documentation/devicetree 25 /bindings/clock/clock-bindings.txt 26 27 Optional properties: 28 - current-speed : the current active speed of the UART. 29 - reg-offset : offset to apply to the mapbase from the start of the registers. 30 - reg-shift : quantity to shift the register offsets by. 31 - reg-io-width : the size (in bytes) of the IO accesses that should be 32 performed on the device. There are some systems that require 32-bit 33 accesses to the UART (e.g. TI davinci). 34 - used-by-rtas : set to indicate that the port is in use by the OpenFirmware 35 RTAS and should not be registered. 36 - no-loopback-test: set to indicate that the port does not implements loopback 37 test mode 38 - fifo-size: the fifo size of the UART. 39 - auto-flow-control: one way to enable automatic flow control support. The 40 driver is allowed to detect support for the capability even without this 41 property. 42 43 Example: 44 45 uart@80230000 { 46 compatible = "ns8250"; 47 reg = <0x80230000 0x100>; 48 clock-frequency = <3686400>; 49 interrupts = <10>; 50 reg-shift = <2>; 51 };