revpi-connect-overlay.dts

/*
 * Device tree overlay for Revolution Pi by KUNBUS
 *
 * RevPi Connect
 */

/dts-v1/;
/plugin/;
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/pinctrl/bcm2835.h>

/{
	compatible = "brcm,bcm2837";

	fragment@0 {
		target-path = "/";
		__overlay__ {
			compatible = "kunbus,revpi-connect", "brcm,bcm2837",
				     "brcm,bcm2836";

			/*
			   The reset of the KSZ8851 used for the pibridge has a
			   circuit, which keeps it pulled for up to 80ms. To
			   workaroud this issue, a regulator is used. The
			   circuit implements a reset instead of a n_reset.
			*/
			pb_rst: regulator_pbrst {
				compatible = "regulator-fixed";
				regulator-name = "pb_rst";
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;
				gpio = <&gpio 40 GPIO_ACTIVE_LOW>;
				startup-delay-us = <80000>;
			};

			leds {
				compatible = "gpio-leds";
				power_red {
					gpios = <&gpio 16 GPIO_ACTIVE_HIGH>;
					linux,default-trigger = "power_red";
				};
				a1_green {
					gpios = <&gpio 30 GPIO_ACTIVE_HIGH>;
					linux,default-trigger = "a1_green";
				};
				a1_red {
					gpios = <&gpio  6 GPIO_ACTIVE_HIGH>;
					linux,default-trigger = "a1_red";
				};
				a2_green {
					gpios = <&gpio 32 GPIO_ACTIVE_HIGH>;
					linux,default-trigger = "a2_green";
				};
				a2_red {
					gpios = <&gpio 33 GPIO_ACTIVE_HIGH>;
					linux,default-trigger = "a2_red";
				};
				a3_green {
					gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
					linux,default-trigger = "a3_green";
				};
				a3_red {
					gpios = <&gpio 3 GPIO_ACTIVE_HIGH>;
					linux,default-trigger = "a3_red";
				};
				act {
					status = "disabled";
				};
			};
		};
	};

	fragment@1 {
		target = <&gpio>;
		__overlay__ {
			spi0_pins {
				/* miso mosi clock */
				brcm,pins     = <37 38 39>;
				brcm,function = <BCM2835_FSEL_ALT0>;
				brcm,pull     = <BCM2835_PUD_OFF>;
			};
			spi0_cs_pins {
				brcm,pins     = <36 35>;
				brcm,function = <BCM2835_FSEL_GPIO_OUT>;
				brcm,pull     = <BCM2835_PUD_OFF>;
			};
			eth2_int_pins {
				brcm,pins     = <8>;
				brcm,function = <BCM2835_FSEL_GPIO_IN>;
				brcm,pull     = <BCM2835_PUD_OFF>;
			};
			eth2_reset_pins {
				brcm,pins     = <40>;
				brcm,function = <BCM2835_FSEL_GPIO_OUT>;
				brcm,pull     = <BCM2835_PUD_OFF>;
			};
			conbridge_int_pins {
				brcm,pins     = <28>;
				brcm,function = <BCM2835_FSEL_GPIO_IN>;
				brcm,pull     = <BCM2835_PUD_OFF>;
			};
			i2c1 {
				/* sda scl */
				brcm,pins     = <44 45>;
				brcm,function = <BCM2835_FSEL_ALT2>;
				brcm,pull     = <BCM2835_PUD_OFF>;
			};
			rs485_pins: rs485_pins {
				/* tx rx rts term */
				brcm,pins     = <14 15 17 41>;
				brcm,function = <BCM2835_FSEL_ALT0
						 BCM2835_FSEL_ALT0
						 BCM2835_FSEL_ALT3
						 BCM2835_FSEL_GPIO_OUT>;
				brcm,pull     = <BCM2835_PUD_DOWN
						 BCM2835_PUD_DOWN
						 BCM2835_PUD_DOWN
						 BCM2835_PUD_UP>;
			};
		};
	};

	fragment@2 {
		target = <&i2c1>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";

			rtc@51 {
				compatible = "nxp,pcf2129";
				reg = <0x51>;
				status = "okay";
			};

			crypto@60 {
				compatible = "atmel,atecc508a";
				reg = <0x60>;
				status = "okay";
			};
		};
	};

	fragment@3 {
		target = <&spidev1>;
		__overlay__ {
			status = "disabled";
		};
	};

	fragment@4 {
		target = <&spi0>;
		__overlay__ {
			cs-gpios = <&gpio 36 GPIO_ACTIVE_LOW>,
				   <&gpio 35 GPIO_ACTIVE_LOW>;
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";

			pileft: ethernet@1 {
				/* PiBridge Ethernet left */
				compatible = "micrel,ks8851";
				reg = <1>;
				spi-max-frequency = <10000000>;	/* <= 40 MHz */
				interrupt-parent = <&gpio>;
				#interrupt-cells = <2>;
				interrupts = <8 IRQ_TYPE_LEVEL_LOW>;
				vdd-supply = <&pb_rst>;
				status = "okay";
			};
		};
	};

	fragment@5 {
		target = <&usb>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;

			hub@1 {
				/* SMSC LAN9514 */
				compatible = "usb424,9514";
				reg = <1>;
				#address-cells = <1>;
				#size-cells = <0>;

				eth0: ethernet@1 {
					compatible = "usb424,ec00";
					reg = <1>;
				};

				hub@5 {
					/* SMSC LAN9512 */
					compatible = "usb424,9512";
					reg = <5>;
					#address-cells = <1>;
					#size-cells = <0>;

					eth1: ethernet@1 {
						compatible = "usb424,ec00";
						reg = <1>;
					};

					uart@2 {
						/* FTDI FT232R (front) */
						compatible = "usb403,6001";
						reg = <2>;
					};

					uart@3 {
						/* FTDI FT232R (conbridge) */
						compatible = "usb403,6001";
						reg = <3>;
					};
				};
			};
		};
	};

	fragment@6 {
		target = <&uart0>;
		__overlay__ {
			linux,rs485-enabled-at-boot-time;
			pinctrl-names = "default";
			pinctrl-0 = <&rs485_pins>;
		};
	};

	__overrides__ {
		eth0_mac_hi = <&eth0>,"local-mac-address:0";
		eth0_mac_lo = <&eth0>,"local-mac-address;4";
		eth1_mac_hi = <&eth1>,"local-mac-address:0";
		eth1_mac_lo = <&eth1>,"local-mac-address;4";
		pileft_mac_hi = <&pileft>,"local-mac-address:0";
		pileft_mac_lo = <&pileft>,"local-mac-address;4";
	};
};