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. 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(-)