Device Tree • RPI5 and RP1 GPIO ALT function

Code:

//0: GPIO in//1: GPIO out//2: alt5//3: alt4//4: alt0//5: alt1//6: alt2//7: alt3

Code:

//0: GPIO in//1: GPIO out//2: alt3//3: alt0//4: alt2//5: none//6: alt1//7: none

Code:

/dts-v1/;/plugin/;/ {    compatible = "brcm,bcm2712";      // General GPIO Configuration    fragment@0 {        target = <&rp1_gpio>;          __overlay__ {            pinctrl-names = "default";            pinctrl-0 = <&button_pins &enable_pin &power_ok_pin &trigger_clk_photo &read_clk_photo >; /            // GPIO pins for pushbuttons configuration            button_pins: button_pins {                brcm,pins = <19 26 21>;  // Define GPIO pins 19, 26, 21 for buttons                brcm,function = <0>;  // Set to input function                brcm,pull = <0>;  // no pulls            };            // GPIO pin for the buck converter enable pin configuration            enable_pin: enable_pin {                brcm,pins = <14>;  //                brcm,function = <0>;  // Set GPIO 14 to input function                brcm,pull = <0>;  //             };            // GPIO pin for the buck converter power ok pin configuration            power_ok_pin: power_ok_pin {                brcm,pins = <15>;  //                 brcm,function = <0>;  // Set GPIO 15 to input function                brcm,pull = <0>;  //             };trigger_clk_photo: trigger_clk_photo {                brcm,pins = <20>;                brcm,function = <2>;  // Set GPIO 20 to fuction 2 -> ALT 3 CPCLK0 brcm,pull = <0>;  // No pull-up or pull-down            };read_clk_photo: read_clk_photo {                brcm,pins = <18>;                brcm,function = <0>;  // Set GPIO 18 to inputbrcm,pull = <0>;  // No pull-up or pull-down            };        };    };