[PATCH 0/2] ARM: dts: samsung: Add support for Hardkernel ODROID-U2

[Josef Schlehofer <pepe.schlehofer@gmail.com>]

This series introduces device tree support for Hardkernel's ODROID-U2
single board computer, based on the Samsung Exynos4412 Prime SoC.

ODROID-U2 is the predecessor of ODROID-U3 and shares most of its hardware
design (2 GB LPDDR2 RAM, LAN9730 10/100 Ethernet on HSIC0, USB3503A hub
on HSIC1, MAX98090 audio codec with headphone jack and on-board MEMS DMIC,
MAX77686 PMIC, PWM-controlled cooling fan header, blue heartbeat LED).

Key differences from ODROID-U3:
- The micro-USB (DWC2 / hsotg) port does not have a VBUS supply switch,
  so it operates only in peripheral mode (dr_mode = "peripheral").
- The 3.5 mm jack is headphone only, and the board features an on-board
  MEMS digital microphone (DMIC) rather than an analog mic input.
- There is no expansion header with SPI.

Hardware verification was performed on a physical ODROID-U2 board running
Linux 6.12:
- DWC2 USB: verified in peripheral mode via /sys/class/udc and dmesg.
- Ethernet: SMSC LAN9730 detected on HSIC0, link up at 100 Mbps Full-Duplex.
- Storage: microSD (mmcblk2) detected and functional. eMMC was not tested,
  as no eMMC module was available.
- Thermal: /sys/class/thermal/cooling_device0/type shows pwm-fan (no fan
  was attached).
- Audio:
  * Stereo headphone playback verified with speaker-test and aplay.
  * On-board digital MEMS microphone (DMIC) recording verified with:
      amixer -c OdroidU2 cset name='DMIC Mux' DMIC
      arecord -D hw:OdroidU2,0 -f S16_LE -r 48000 -c 2 -d 5 /tmp/dmic.wav
      aplay -D hw:OdroidU2,0 /tmp/dmic.wav
    Audio routing includes "Mixer DAI RX", "HiFi Capture" connecting the
    MAX98090 codec capture to the Exynos I2S controller.
- LED: blue:heartbeat blinking with heartbeat trigger.

Josef Schlehofer (2):
  dt-bindings: arm: samsung: Add Hardkernel ODROID-U2
  ARM: dts: samsung: Add Hardkernel ODROID-U2

 .../bindings/arm/samsung/samsung-boards.yaml  |   1 +
 arch/arm/boot/dts/samsung/Makefile            |   1 +
 .../dts/samsung/exynos4412-odroid-common.dtsi |   6 +-
 .../boot/dts/samsung/exynos4412-odroidu2.dts  | 139 ++++++++++++++++++
 4 files changed, 144 insertions(+), 3 deletions(-)
 create mode 100644 arch/arm/boot/dts/samsung/exynos4412-odroidu2.dts


base-commit: 58161ead29e50d70a317ea26b472e0c7508e69da
-- 
2.54.0 (Apple Git-157)