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: > 1. 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 <[email protected]> # S32G3, interrupt-driven > 2. 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 >
