The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/serial/cirrus,clps711x-uart.txt

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    1 * Cirrus Logic CLPS711X Universal Asynchronous Receiver/Transmitter (UART)
    2 
    3 Required properties:
    4 - compatible: Should be "cirrus,ep7209-uart".
    5 - reg: Address and length of the register set for the device.
    6 - interrupts: Should contain UART TX and RX interrupt.
    7 - clocks: Should contain UART core clock number.
    8 - syscon: Phandle to SYSCON node, which contain UART control bits.
    9 
   10 Optional properties:
   11 - {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD
   12   line respectively.
   13 
   14 Note: Each UART port should have an alias correctly numbered
   15 in "aliases" node.
   16 
   17 Example:
   18         aliases {
   19                 serial0 = &uart1;
   20         };
   21 
   22         uart1: uart@80000480 {
   23                 compatible = "cirrus,ep7312-uart","cirrus,ep7209-uart";
   24                 reg = <0x80000480 0x80>;
   25                 interrupts = <12 13>;
   26                 clocks = <&clks 11>;
   27                 syscon = <&syscon1>;
   28                 cts-gpios = <&sysgpio 0 GPIO_ACTIVE_LOW>;
   29                 dsr-gpios = <&sysgpio 1 GPIO_ACTIVE_LOW>;
   30                 dcd-gpios = <&sysgpio 2 GPIO_ACTIVE_LOW>;
   31         };

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