Hi Larisa,
On Mon, Feb 16, 2026 at 04:01:52PM +0100, Larisa Grigore wrote:
This patchset enhances the LINFlexD UART driver and its device tree bindings to support DMA transfers, configurable clock inputs, dynamic baudrate changes, and termios features. It also includes a series of fixes and improvements to ensure reliable operation across various modes and configurations.
The changes added can be summarized as follows:
- Fixes with respect to FIFO handling, locking, interrupt related registers and
INITM mode transition.
Tested this series with the default devicetree configuration by booting the board to a login prompt about 200 times. Without the series applied, I was seeing a bug roughly every 30-50 boots where the kernel would would hang in linflex_console_putchar() waiting for DTFTFF. In my tests with the series applied, I didn't see any regressions and the bug no longer appeared. Thanks for the fix!
Tested-by: Jared Kangas jkangas@redhat.com # S32G3, interrupt-driven
- Removal of the earlycon workaround, as proper FIFO handling and INITM
transitions now ensure stable behavior. 3. Support for configurable stop bits and dynamic baudrate changes based on clock inputs and termios settings. 4. Optional DMA support for RX and TX paths, preventing character loss during high-throughput operations like copy-paste. Cyclic DMA is used for RX to avoid gaps between transactions.
Larisa Grigore (8): serial: linflexuart: Clean SLEEP bit in LINCR1 after suspend serial: linflexuart: Check FIFO full before writing serial: linflexuart: Correctly clear UARTSR in buffer mode serial: linflexuart: Update RXEN/TXEN outside INITM mode serial: linflexuart: Ensure FIFO is empty when entering INITM serial: linflexuart: Revert earlycon workaround serial: linflexuart: Add support for configurable stop bits serial: linflexuart: Add DMA support
Radu Pirea (5): serial: linflexuart: Fix locking in set_termios dt-bindings: serial: fsl-linflexuart: add clock input properties dt-bindings: serial: fsl-linflexuart: add dma properties serial: linflexuart: Add support for changing baudrate serial: linflexuart: Avoid stopping DMA during receive operations
.../bindings/serial/fsl,s32-linflexuart.yaml | 31 + drivers/tty/serial/fsl_linflexuart.c | 972 +++++++++++++++--- 2 files changed, 846 insertions(+), 157 deletions(-)
-- 2.47.0