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serial: 8250_uniphier: add bindings document for UniPhier UART

This is binding information for the UniPhier on-chip UART driver
(drivers/tty/serial/8250/8250_uniphier.c).

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

authored by

Masahiro Yamada and committed by
Greg Kroah-Hartman
6cf600ab f10a2233

+23
+23
Documentation/devicetree/bindings/serial/uniphier-uart.txt
··· 1 + UniPhier UART controller 2 + 3 + Required properties: 4 + - compatible: should be "socionext,uniphier-uart". 5 + - reg: offset and length of the register set for the device. 6 + - interrupts: a single interrupt specifier. 7 + - clocks: phandle to the input clock. 8 + 9 + Optional properties: 10 + - fifo-size: the RX/TX FIFO size. Defaults to 64 if not specified. 11 + 12 + Example: 13 + aliases { 14 + serial0 = &serial0; 15 + }; 16 + 17 + serial0: serial@54006800 { 18 + compatible = "socionext,uniphier-uart"; 19 + reg = <0x54006800 0x40>; 20 + interrupts = <0 33 4>; 21 + clocks = <&uart_clk>; 22 + fifo-size = <64>; 23 + };