arm: dts: mt6589: Add device tree for Fairphone 1

Add rudimentary support for the Fairphone 1, based on MT6589 to boot to
UART console.

The recently added SMP support needs to be disabled for this board as
the kernel panics executing /init with it, even though the CPUs seem to
start up fine - maybe a stability issue.

[    0.072010] smp: Bringing up secondary CPUs ...
[    0.131888] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[    0.191889] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
[    0.251890] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
[    0.251982] smp: Brought up 1 node, 4 CPUs
[    0.254745] SMP: Total of 4 processors activated (7982.28 BogoMIPS).
[    0.255582] CPU: All CPU(s) started in SVC mode.

[    0.472039] Run /init as init process
[    0.473317] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lore.kernel.org/r/20211024084535.30959-1-luca@z3ntu.xyz
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 0de64f237cd87583ff2cf5e7079ac6941b5ffc85..8a2dfdf01ce3e2c3e61903ba098fbad0a3401da7 100644 (file)
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -1457,6 +1457,7 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += \
        mt2701-evb.dtb \
        mt6580-evbp1.dtb \
        mt6589-aquaris5.dtb \
+       mt6589-fairphone-fp1.dtb \
        mt6592-evb.dtb \
        mt7623a-rfb-emmc.dtb \
        mt7623a-rfb-nand.dtb \

diff --git a/arch/arm/boot/dts/mt6589-fairphone-fp1.dts b/arch/arm/boot/dts/mt6589-fairphone-fp1.dts
new file mode 100644 (file)
index 0000000..c952347
--- /dev/null
+++ b/arch/arm/boot/dts/mt6589-fairphone-fp1.dts
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) 2021, Luca Weiss <luca@z3ntu.xyz>
+ */
+
+/dts-v1/;
+#include "mt6589.dtsi"
+
+/ {
+       model = "Fairphone 1";
+       compatible = "fairphone,fp1", "mediatek,mt6589";
+
+       chosen {
+               stdout-path = &uart3;
+       };
+
+       memory@80000000 {
+               device_type = "memory";
+               reg = <0x80000000 0x40000000>;
+       };
+};
+
+&cpus {
+       /* SMP is not stable on this board, makes the kernel panic */
+       /delete-property/ enable-method;
+};
+
+&uart3 {
+       status = "okay";
+};

diff --git a/arch/arm/boot/dts/mt6589.dtsi b/arch/arm/boot/dts/mt6589.dtsi
index 70df00a7bb26701dc2cdeb21272e45c7298af5ea..c6babc8ad2ba6c2c61bb1d976ef8629af73bf05a 100644 (file)
--- a/arch/arm/boot/dts/mt6589.dtsi
+++ b/arch/arm/boot/dts/mt6589.dtsi
@@ -14,7 +14,7 @@
        compatible = "mediatek,mt6589";
        interrupt-parent = <&sysirq>;
 
-       cpus {
+       cpus: cpus {
                #address-cells = <1>;
                #size-cells = <0>;
                enable-method = "mediatek,mt6589-smp";