Device Tree • Re: Using an overlay to send a clock signal to a GPIO pin.

Code:

/dts-v1/;/plugin/;/ {    compatible = "brcm,bcm2712";    fragment@0 {        target-path = "/";        __overlay__ {            leds: leds {                gpclk_dummy_led: gpclk-dummy-led {                    label = "GPCLK0_OUT";                    gpios = <&rp1_gpio 4 0>;                    default-state = "off";                    pinctrl-names = "default";                    pinctrl-0 = <&gpclk0_pin>;                    assigned-clocks = <&rp1_clocks 33>;   // RP1_CLK_GP0                    assigned-clock-parents = <&clk_osc>;  // 24MHz oscillator                    assigned-clock-rates = <12288000>;    // 12.288 MHz                };            };        };    };    fragment@1 {        target = <&rp1_gpio>;        __overlay__ {            gpclk0_pin: gpclk0_pin {                brcm,pins = <4>;     // GPIO4 / Pin 7                brcm,function = <4>; // ALT0  / GPCLK0                brcm,pull = <0>;            };        };    };};