[meta-rockchip] [PATCH] tinker-board-3: add

[michael.opdenacker@rootcommit.com]

From: Michael Opdenacker <michael.opdenacker@rootcommit.com>

Add basic support for the Asus Tinker Board 3 [1] and 3S [2] SBCs,
with the Rockchip rk3566 SoC.

Support for such boards was introduced in the 6.19-rc1 version
of the Linux kernel:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9f80b3952318d7ef18573a5010f06118602f992e

Therefore, the https://github.com/betafive/meta-linux-mainline/
layer is currently a prerequisite to build images for such machines.

Here are already supported features:
- Debug UART (/dev/ttyS2)
- SD card (/dev/mmcblk1)
- eMMC (/dev/mmcblk0, only on Tinker Board 3S)
- I2C:
  - i2c0 (internal bus with a PMIC and regulators)
  - i2c2 (internal bus with an at24 eeprom and an RTC device)
- USB 2.0 ports
- 2 GPIO LEDS

[1] https://tinker-board.asus.com/series/tinker-board-3.html
[2] https://tinker-board.asus.com/series/tinker-board-3s.html

Signed-off-by: Michael Opdenacker <michael.opdenacker@rootcommit.com>
---
 conf/machine/include/tinker-board-3.inc     | 11 +++++++++++
 conf/machine/tinker-board-3.conf            | 10 ++++++++++
 conf/machine/tinker-board-3s.conf           | 10 ++++++++++
 recipes-kernel/linux/linux-yocto_%.bbappend |  2 ++
 4 files changed, 33 insertions(+)
 create mode 100644 conf/machine/include/tinker-board-3.inc
 create mode 100644 conf/machine/tinker-board-3.conf
 create mode 100644 conf/machine/tinker-board-3s.conf

diff --git a/conf/machine/include/tinker-board-3.inc b/conf/machine/include/tinker-board-3.inc
new file mode 100644
index 0000000..17d0ecc
--- /dev/null
+++ b/conf/machine/include/tinker-board-3.inc
@@ -0,0 +1,11 @@
+require conf/machine/include/rk3566.inc
+
+# Kernel provided by https://github.com/betafive/meta-linux-mainline/
+PREFERRED_PROVIDER_virtual/kernel = "linux-mainline"
+PREFERRED_VERSION_virtual/kernel = "6.19-rc1"
+
+MACHINE_EXTRA_RRECOMMENDS += "kernel-modules"
+
+# U-Boot doesn't support Tinker Board 3 so far
+# but boots fine when configured for a similar SBC
+UBOOT_MACHINE = "soquartz-model-a-rk3566_defconfig"
diff --git a/conf/machine/tinker-board-3.conf b/conf/machine/tinker-board-3.conf
new file mode 100644
index 0000000..d6400f3
--- /dev/null
+++ b/conf/machine/tinker-board-3.conf
@@ -0,0 +1,10 @@
+# Copyright (C) 2025 Michael Opdenacker <michael.opdenacker@rootcommit.com>
+# Released under the MIT license (see COPYING.MIT for the terms)
+
+#@TYPE: Machine
+#@NAME: Tinker Board 3 RK3566
+#@DESCRIPTION: ASUS Tinker Board 3 is a Raspberry Pi like SBC based on Rockchip RK3566 Processor.
+
+require conf/machine/include/tinker-board-3.inc
+
+KERNEL_DEVICETREE = "rockchip/rk3566-tinker-board-3.dtb"
diff --git a/conf/machine/tinker-board-3s.conf b/conf/machine/tinker-board-3s.conf
new file mode 100644
index 0000000..e23dc8b
--- /dev/null
+++ b/conf/machine/tinker-board-3s.conf
@@ -0,0 +1,10 @@
+# Copyright (C) 2025 Michael Opdenacker <michael.opdenacker@rootcommit.com>
+# Released under the MIT license (see COPYING.MIT for the terms)
+
+#@TYPE: Machine
+#@NAME: Tinker Board 3S RK3566
+#@DESCRIPTION: ASUS Tinker Board 3 is a Raspberry Pi like SBC based on Rockchip RK3566 Processor.
+
+require conf/machine/include/tinker-board-3.inc
+
+KERNEL_DEVICETREE = "rockchip/rk3566-tinker-board-3s.dtb"
diff --git a/recipes-kernel/linux/linux-yocto_%.bbappend b/recipes-kernel/linux/linux-yocto_%.bbappend
index 2dba3d7..684d33a 100644
--- a/recipes-kernel/linux/linux-yocto_%.bbappend
+++ b/recipes-kernel/linux/linux-yocto_%.bbappend
@@ -30,6 +30,8 @@ COMPATIBLE_MACHINE:rock-pi-e = "rock-pi-e"
 COMPATIBLE_MACHINE:rock-pi-s = "rock-pi-s"
 COMPATIBLE_MACHINE:rock64 = "rock64"
 COMPATIBLE_MACHINE:soquartz = "soquartz"
+COMPATIBLE_MACHINE:tinker-board-3 = "tinker-board-3"
+COMPATIBLE_MACHINE:tinker-board-3s = "tinker-board-3s"
 
 SRC_URI:append:rockchip = " file://rockchip-kmeta;type=kmeta;name=rockchip-kmeta;destsuffix=rockchip-kmeta"
 SRC_URI:append:nanopi-r4s = " file://realtek-r8169.cfg"