BCM2708: Add core Device Tree support

Add the bare minimum needed to boot BCM2708 from a Device Tree.

Signed-off-by: Noralf Tronnes <notro@tronnes.org>

BCM2708: DT: change 'axi' nodename to 'soc'

Change DT node named 'axi' to 'soc' so it matches ARCH_BCM2835.
The VC4 bootloader fills in certain properties in the 'axi' subtree,
but since this is part of an upstreaming effort, the name is changed.

Signed-off-by: Noralf Tronnes notro@tronnes.org

BCM2708_DT: Correct length of the peripheral space

arch/arm/boot/dts/Makefile

@@ -1,5 +1,21 @@
 ifeq ($(CONFIG_OF),y)
 
+dtb-$(CONFIG_BCM2708_DT) += bcm2708-rpi-b.dtb
+dtb-$(CONFIG_BCM2708_DT) += bcm2708-rpi-b-plus.dtb
+dtb-$(CONFIG_BCM2708_DT) += bcm2708-rpi-cm.dtb
+dtb-$(CONFIG_BCM2709_DT) += bcm2709-rpi-2-b.dtb
+
+# Raspberry Pi
+ifeq ($(CONFIG_BCM2708_DT),y)
+ RPI_DT_OVERLAYS=y
+endif
+ifeq ($(CONFIG_BCM2709_DT),y)
+ RPI_DT_OVERLAYS=y
+endif
+ifeq ($(CONFIG_ARCH_BCM2835),y)
+ RPI_DT_OVERLAYS=y
+endif
+
 dtb-$(CONFIG_ARCH_ALPINE) += \
  alpine-db.dtb
 dtb-$(CONFIG_MACH_ASM9260) += \
@@ -660,7 +676,18 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += \
  mt6592-evb.dtb \
  mt8127-moose.dtb \
  mt8135-evbp1.dtb
+
+targets += dtbs dtbs_install
+targets += $(dtb-y)
+
 endif
 
 always := $(dtb-y)
 clean-files := *.dtb
+
+# Enable fixups to support overlays on BCM2708 platforms
+ifeq ($(RPI_DT_OVERLAYS),y)
+ DTC_FLAGS ?= -@
+endif
+
+subdir-y += overlays

arch/arm/boot/dts/bcm2708-rpi-b-plus.dts

@@ -0,0 +1,140 @@
+/dts-v1/;
+
+/include/ "bcm2708.dtsi"
+
+/ {
+ compatible = "brcm,bcm2708";
+ model = "Raspberry Pi Model B+";
+
+ aliases {
+ soc = &soc;
+ spi0 = &spi0;
+ i2c0 = &i2c0;
+ i2c1 = &i2c1;
+ i2s = &i2s;
+ gpio = &gpio;
+ intc = &intc;
+ leds = &leds;
+ audio = &audio;
+ sound = &sound;
+ uart0 = &uart0;
+ uart1 = &uart1;
+ clocks = &clocks;
+ };
+
+ sound: sound {
+ };
+};
+
+&gpio {
+ spi0_pins: spi0_pins {
+ brcm,pins = <7 8 9 10 11>;
+ brcm,function = <4>; /* alt0 */
+ };
+
+ i2c0_pins: i2c0 {
+ brcm,pins = <0 1>;
+ brcm,function = <4>;
+ };
+
+ i2c1_pins: i2c1 {
+ brcm,pins = <2 3>;
+ brcm,function = <4>;
+ };
+
+ i2s_pins: i2s {
+ brcm,pins = <18 19 20 21>;
+ brcm,function = <4>; /* alt0 */
+ };
+};
+
+&mmc {
+ status = "okay";
+ bus-width = <4>;
+};
+
+&fb {
+ status = "okay";
+};
+
+&uart0 {
+ status = "okay";
+};
+
+&spi0 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&spi0_pins>;
+
+ spidev@0{
+ compatible = "spidev";
+ reg = <0>; /* CE0 */
+ #address-cells = <1>;
+ #size-cells = <0>;
+ spi-max-frequency = <500000>;
+ };
+
+ spidev@1{
+ compatible = "spidev";
+ reg = <1>; /* CE1 */
+ #address-cells = <1>;
+ #size-cells = <0>;
+ spi-max-frequency = <500000>;
+ };
+};
+
+&i2c0 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&i2c0_pins>;
+ clock-frequency = <100000>;
+};
+
+&i2c1 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&i2c1_pins>;
+ clock-frequency = <100000>;
+};
+
+&i2s {
+ #sound-dai-cells = <0>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&i2s_pins>;
+};
+
+&leds {
+ act_led: act {
+ label = "led0";
+ linux,default-trigger = "mmc0";
+ gpios = <&gpio 47 0>;
+ };
+
+ pwr_led: pwr {
+ label = "led1";
+ linux,default-trigger = "input";
+ gpios = <&gpio 35 0>;
+ };
+};
+
+/ {
+ __overrides__ {
+ uart0 = <&uart0>,"status";
+ uart0_clkrate = <&clk_uart0>,"clock-frequency:0";
+ i2s = <&i2s>,"status";
+ spi = <&spi0>,"status";
+ i2c0 = <&i2c0>,"status";
+ i2c1 = <&i2c1>,"status";
+ i2c0_baudrate = <&i2c0>,"clock-frequency:0";
+ i2c1_baudrate = <&i2c1>,"clock-frequency:0";
+
+ act_led_gpio = <&act_led>,"gpios:4";
+ act_led_activelow = <&act_led>,"gpios:8";
+ act_led_trigger = <&act_led>,"linux,default-trigger";
+
+ pwr_led_gpio = <&pwr_led>,"gpios:4";
+ pwr_led_activelow = <&pwr_led>,"gpios:8";
+ pwr_led_trigger = <&pwr_led>,"linux,default-trigger";
+
+ audio = <&audio>,"status";
+ watchdog = <&watchdog>,"status";
+ random = <&random>,"status";
+ };
+};

arch/arm/boot/dts/bcm2708-rpi-b.dts

@@ -0,0 +1,130 @@
+/dts-v1/;
+
+/include/ "bcm2708.dtsi"
+
+/ {
+ compatible = "brcm,bcm2708";
+ model = "Raspberry Pi Model B";
+
+ aliases {
+ soc = &soc;
+ spi0 = &spi0;
+ i2c0 = &i2c0;
+ i2c1 = &i2c1;
+ i2s = &i2s;
+ gpio = &gpio;
+ intc = &intc;
+ leds = &leds;
+ audio = &audio;
+ sound = &sound;
+ uart0 = &uart0;
+ uart1 = &uart1;
+ clocks = &clocks;
+ };
+
+ sound: sound {
+ };
+};
+
+&gpio {
+ spi0_pins: spi0_pins {
+ brcm,pins = <7 8 9 10 11>;
+ brcm,function = <4>; /* alt0 */
+ };
+
+ i2c0_pins: i2c0 {
+ brcm,pins = <0 1>;
+ brcm,function = <4>;
+ };
+
+ i2c1_pins: i2c1 {
+ brcm,pins = <2 3>;
+ brcm,function = <4>;
+ };
+
+ i2s_pins: i2s {
+ brcm,pins = <28 29 30 31>;
+ brcm,function = <4>; /* alt0 */
+ };
+};
+
+&mmc {
+ status = "okay";
+ bus-width = <4>;
+};
+
+&fb {
+ status = "okay";
+};
+
+&uart0 {
+ status = "okay";
+};
+
+&spi0 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&spi0_pins>;
+
+ spidev@0{
+ compatible = "spidev";
+ reg = <0>; /* CE0 */
+ #address-cells = <1>;
+ #size-cells = <0>;
+ spi-max-frequency = <500000>;
+ };
+
+ spidev@1{
+ compatible = "spidev";
+ reg = <1>; /* CE1 */
+ #address-cells = <1>;
+ #size-cells = <0>;
+ spi-max-frequency = <500000>;
+ };
+};
+
+&i2c0 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&i2c0_pins>;
+ clock-frequency = <100000>;
+};
+
+&i2c1 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&i2c1_pins>;
+ clock-frequency = <100000>;
+};
+
+&i2s {
+ #sound-dai-cells = <0>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&i2s_pins>;
+};
+
+&leds {
+ act_led: act {
+ label = "led0";
+ linux,default-trigger = "mmc0";
+ gpios = <&gpio 16 1>;
+ };
+};
+
+/ {
+ __overrides__ {
+ uart0 = <&uart0>,"status";
+ uart0_clkrate = <&clk_uart0>,"clock-frequency:0";
+ i2s = <&i2s>,"status";
+ spi = <&spi0>,"status";
+ i2c0 = <&i2c0>,"status";
+ i2c1 = <&i2c1>,"status";
+ i2c0_baudrate = <&i2c0>,"clock-frequency:0";
+ i2c1_baudrate = <&i2c1>,"clock-frequency:0";
+
+ act_led_gpio = <&act_led>,"gpios:4";
+ act_led_activelow = <&act_led>,"gpios:8";
+ act_led_trigger = <&act_led>,"linux,default-trigger";
+
+ audio = <&audio>,"status";
+ watchdog = <&watchdog>,"status";
+ random = <&random>,"status";
+ };
+};

arch/arm/boot/dts/bcm2708-rpi-cm.dts

@@ -0,0 +1,18 @@
+/dts-v1/;
+
+/include/ "bcm2708-rpi-cm.dtsi"
+
+/ {
+ model = "Raspberry Pi Compute Module";
+};
+
+&uart0 {
+ status = "okay";
+};
+
+/ {
+ __overrides__ {
+ uart0 = <&uart0>,"status";
+ uart0_clkrate = <&clk_uart0>,"clock-frequency:0";
+ };
+};

arch/arm/boot/dts/bcm2708-rpi-cm.dtsi

@@ -0,0 +1,51 @@
+/include/ "bcm2708.dtsi"
+
+/ {
+ aliases {
+ soc = &soc;
+ spi0 = &spi0;
+ i2c0 = &i2c0;
+ i2c1 = &i2c1;
+ i2s = &i2s;
+ gpio = &gpio;
+ intc = &intc;
+ leds = &leds;
+ audio = &audio;
+ sound = &sound;
+ uart0 = &uart0;
+ uart1 = &uart1;
+ clocks = &clocks;
+ };
+
+ sound: sound {
+ };
+};
+
+&leds {
+ act_led: act {
+ label = "led0";
+ linux,default-trigger = "mmc0";
+ gpios = <&gpio 47 0>;
+ };
+};
+
+&mmc {
+ status = "okay";
+ bus-width = <4>;
+};
+
+&fb {
+ status = "okay";
+};
+
+&audio {
+ status = "okay";
+};
+
+/ {
+ __overrides__ {
+ act_led_gpio = <&act_led>,"gpios:4";
+ act_led_activelow = <&act_led>,"gpios:8";
+ act_led_trigger = <&act_led>,"linux,default-trigger";
+ };
+};