The Raspberry Pi 400 is like a Pi 4 B designed into a keyboard. But there
are some minor differences:
- higher CPU clock rate (1.8 GHz)
- different Wifi chip (BCM43456)
- power off is now handled via GPIO
- no ACT LED
Signed-off-by: Stefan Wahren <stefan.wahren@xxxxxxxx>
---
arch/arm/boot/dts/Makefile | 1 +
arch/arm/boot/dts/bcm2711-rpi-400.dts | 45 +++++++++++++++++++++++++++++++++++
2 files changed, 46 insertions(+)
create mode 100644 arch/arm/boot/dts/bcm2711-rpi-400.dts
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index f8f09c5..ec00dba 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -88,6 +88,7 @@ dtb-$(CONFIG_ARCH_BCM2835) += \
bcm2837-rpi-3-b.dtb \
bcm2837-rpi-3-b-plus.dtb \
bcm2837-rpi-cm3-io3.dtb \
+ bcm2711-rpi-400.dtb \
bcm2711-rpi-4-b.dtb \
bcm2835-rpi-zero.dtb \
bcm2835-rpi-zero-w.dtb
diff --git a/arch/arm/boot/dts/bcm2711-rpi-400.dts b/arch/arm/boot/dts/bcm2711-rpi-400.dts
new file mode 100644
index 0000000..f4d2fc2
--- /dev/null
+++ b/arch/arm/boot/dts/bcm2711-rpi-400.dts
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+#include "bcm2711-rpi-4-b.dts"
+
+/ {
+ compatible = "raspberrypi,400", "brcm,bcm2711";
+ model = "Raspberry Pi 400";
+
+ chosen {
+ /* 8250 auxiliary UART instead of pl011 */
+ stdout-path = "serial1:115200n8";
+ };
+
+ leds {
+ /delete-node/ led-act;
+
+ led-pwr {
+ gpios = <&gpio 42 GPIO_ACTIVE_HIGH>;
+ };
+ };
+
+ gpio-poweroff {
+ compatible = "gpio-poweroff";
+ gpios = <&expgpio 5 GPIO_ACTIVE_HIGH>;
+ };
+};
+
+&expgpio {
+ gpio-line-names = "BT_ON",
+ "WL_ON",
+ "",
+ "GLOBAL_RESET",
+ "VDD_SD_IO_SEL",
+ "CAM_GPIO",
+ "SD_PWR_ON",
+ "SD_OC_N";
+};
+
+&genet_mdio {
+ clock-frequency = <1950000>;
+};
+
+&pm {
+ /delete-property/ system-power-controller;
+};
--
2.7.4
