[PATCH v3 0/4] arm64: dts: amlogic: t7: Add UART support and enable Bluetooth on VIM4

Ronald Claveau
2026-04-20T11:58:29Z

This series adds all UART controllers for the Amlogic T7 SoC and enables
the Bluetooth controller on the Khadas VIM4 board.

The T7 SoC ships with six UART controllers (A through F), but only
uart_a was previously described in the device tree.

- Patch 1 adds the pinctrl group for UART C, which is needed to route
its four signals (TX, RX, CTS, RTS) through the correct pads.

- Patch 2 completes the uart_a node (peripheral clock) and
repositions it to respect the ascending reg address order required
by the DT specification. It then adds nodes for UART B through F,
each with their respective peripheral clock.

- Patch 3 removes redundant clocks and clock-names for UART A on
Khadas VIM4 DT. It then uses those defined from DTSI.

- Patch 4 enables UART C on the Khadas VIM4 board and attaches the
on-board BCM43438 Bluetooth controller to it, with hardware flow
control, wakeup GPIOs, LPO clock and power supplies.

Signed-off-by: Ronald Claveau <linux-kernel-dev@aliel.fr>
---
Changes in v3:
- Patches 3-4: split into two separate patches:
3. remove redundant clocks from UART A
4. add UART C node according to Neil's feedback.
- Link to v2: https://lore.kernel.org/r/20260416-add-bluetooth-t7-vim4-v2-0-9a57098fd055@aliel.fr

Changes in v2:
- PATCH 1: change underscore to dash in pin node name,
according to Xianwei's feedback.
- PATCH 3: remove clocks and clock-names as already defined in DTSI,
according to Xianwei's feedback.
- Link to v1: https://lore.kernel.org/r/20260415-add-bluetooth-t7-vim4-v1-0-0ba0746cc1d6@aliel.fr

---
Ronald Claveau (4):
arm64: dts: amlogic: t7: Add uart_c pinctrl pins group
arm64: dts: amlogic: t7: Add UART controllers nodes
arm64: dts: amlogic: t7: khadas-vim4: Remove redundant clocks from UART A
arm64: dts: amlogic: t7: khadas-vim4: Enable Bluetooth

.../dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts | 21 ++++++-
arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi | 73 +++++++++++++++++++---
2 files changed, 85 insertions(+), 9 deletions(-)
---
base-commit: 6aa9edb4f8266cfb913ee74f5e55116550b5574d
change-id: 20260414-add-bluetooth-t7-vim4-f01e03c4ec2a

Best regards,
--
Ronald Claveau <linux-kernel-dev@aliel.fr>