arm: dts: First draft of upstream Pi4 DTS

I've attempted to follow the upstream conventions in the DT commits,
but this is just presented here initially as a talking point.

Signed-off-by: Phil Elwell <[email protected]>

Author: Phil Elwell

arch/arm/boot/dts/Makefile

@@ -96,6 +96,7 @@ dtb-$(CONFIG_ARCH_BCM2835) += \
 	bcm2837-rpi-3-b.dtb \
 	bcm2837-rpi-3-b-plus.dtb \
 	bcm2837-rpi-cm3-io3.dtb \
+	bcm2838-rpi-4-b.dtb \
 	bcm2835-rpi-zero.dtb \
 	bcm2835-rpi-zero-w.dtb
 dtb-$(CONFIG_ARCH_BCM_5301X) += \

arch/arm/boot/dts/bcm2838-rpi-4-b.dts

@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+#include "bcm2838.dtsi"
+#include "bcm2835-rpi.dtsi"
+#include "bcm2838-rpi.dtsi"
+
+/ {
+	compatible = "raspberrypi,4-model-b", "brcm,bcm2838";
+	model = "Raspberry Pi 4 Model B";
+
+	chosen {
+		/* 8250 auxiliary UART instead of pl011 */
+		stdout-path = "serial1:115200n8";
+	};
+
+	memory {
+		reg = <0 0 0x40000000>;
+	};
+
+	leds {
+		act {
+			gpios = <&gpio 42 GPIO_ACTIVE_HIGH>;
+		};
+
+		pwr {
+			label = "PWR";
+			gpios = <&expgpio 2 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	wifi_pwrseq: wifi-pwrseq {
+		compatible = "mmc-pwrseq-simple";
+		reset-gpios = <&expgpio 1 GPIO_ACTIVE_LOW>;
+	};
+
+	sd_io_1v8_reg: sd_io_1v8_reg {
+		status = "okay";
+		compatible = "regulator-gpio";
+		vin-supply = <&vdd_5v0_reg>;
+		regulator-name = "vdd-sd-io";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-boot-on;
+		regulator-always-on;
+		regulator-settling-time-us = <5000>;
+
+		gpios = <&expgpio 4 GPIO_ACTIVE_HIGH>;
+		states = <1800000 0x1
+			  3300000 0x0>;
+	};
+};
+
+&firmware {
+	expgpio: gpio {
+		compatible = "raspberrypi,firmware-gpio";
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names = "BT_ON",
+				  "WL_ON",
+				  "PWR_LED_OFF",
+				  "GLOBAL_RESET",
+				  "VDD_SD_IO_SEL",
+				  "CAM_GPIO",
+				  "",
+				  "";
+		status = "okay";
+	};
+};
+
+&pwm1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pwm0_gpio40 &pwm1_gpio41>;
+	status = "okay";
+};
+
+/* SDHCI is used to control the SDIO for wireless */
+&sdhci {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&emmc_gpio34>;
+	status = "okay";
+	bus-width = <4>;
+	non-removable;
+	mmc-pwrseq = <&wifi_pwrseq>;
+
+	brcmf: wifi@1 {
+		reg = <1>;
+		compatible = "brcm,bcm4329-fmac";
+	};
+};
+
+/* EMMC2 is used to drive the SD card */
+&emmc2 {
+	status = "okay";
+	broken-cd;
+	vqmmc-supply = <&sd_io_1v8_reg>;
+};
+
+/* uart0 communicates with the BT module */
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_ctsrts_gpio30 &uart0_gpio32 &gpclk2_gpio43>;
+	status = "okay";
+
+	bluetooth {
+		compatible = "brcm,bcm43438-bt";
+		max-speed = <2000000>;
+		shutdown-gpios = <&expgpio 0 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+/* uart1 is mapped to the pin header */
+&uart1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart1_gpio14>;
+	status = "okay";
+};

arch/arm/boot/dts/bcm2838-rpi.dtsi

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/ {
+	soc {
+		/delete-node/ mailbox@7e00b840;
+	};
+};
+
+&scb {
+	vchiq: mailbox@7e00b840 {
+		compatible = "brcm,bcm2838-vchiq";
+		reg = <0 0x7e00b840 0x3c>;
+		interrupts = <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
+	};
+};
+
+&dma {
+	/* The VPU firmware uses DMA channel 11 for VCHIQ */
+	brcm,dma-channel-mask = <0x1f5>;
+};
+
+&dma40 {
+	/* The VPU firmware DMA channel 11 for VCHIQ */
+	brcm,dma-channel-mask = <0x7000>;
+};