ARM: dts: Add Raspberry Pi 400 support

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@i2se.com>
Link: https://lore.kernel.org/r/1622981777-5023-7-git-send-email-stefan.wahren@i2se.com
Signed-off-by: Nicolas Saenz Julienne <nsaenz@kernel.org>

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index f8f09c5..ec00dba 100644 (file)
--- 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 (file)
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;
+};