[기술노트] sc16is752 device tree

&spi1{

    pinctrl-names = "default","sleep";

    pinctrl-0 = <&spi1_pins_mx>;

    pinctrl-1 = <&spi1_sleep_pins_mx>;

    status = "okay";

    /delete-property/dmas;

    /delete-property/dma-names;

    cs-gpios = <&gpioa 4 0>;

    sc16is752: sc16is752@0 {

        compatible = "nxp,sc16is752";

        reg = <0>;

        clocks = <&sc16is752_clk>;

        reset-gpios = <&gpiod 11 GPIO_ACTIVE_LOW>; // resetpin

        interrupt-parent = <&gpiod>; // pd4

        interrupts = <4 IRQ_TYPE_EDGE_FALLING>;

        gpio-controller;

        #gpio-cells = <2>;

        clock-frequency = <20000000>;

        sc16is752_clk: sc16is752_clk {

            compatible = "fixed-clock";

            #clock-cells = <0>;

            clock-frequency = <1843200>;

        };      

    };  

};

[    1.894651] sc16is752@0 enforce active low on chipselect handle
[    1.897624] serial serial0: tty port ttySC0 registered
[    1.898114] spi1.0: ttySC1 at I/O 0x1 (irq = 56, base_baud = 115200) is a SC16IS752
[    1.898533] serial serial1: tty port ttySC1 registered