[v2,0/4] stm32 usart add fifo threshold configuration

Message

Erwan LE RAY April 13, 2021, 5:40 p.m. UTC

This series adds the support for two optional DT properties to configure
RX and TX FIFO thresholds:
 - rx-threshold
 - tx-threshold
This replaces hard-coded 8 bytes threshold. No functional change expected
if unspecified (keep 8 as default).

Changes in v2:
Change added properties naming and factorize it in serial.yaml as proposed
by Rob Herring. 

Erwan Le Ray (3):
  dt-bindings: serial: add RX and TX FIFO properties
  dt-bindings: serial: stm32: override FIFO threshold properties
  dt-bindings: serial: 8250: update TX FIFO trigger level

Fabrice Gasnier (1):
  serial: stm32: add FIFO threshold configuration

 .../devicetree/bindings/serial/8250.yaml      |  1 -
 .../devicetree/bindings/serial/serial.yaml    | 10 ++++
 .../bindings/serial/st,stm32-uart.yaml        | 27 +++++++++-
 drivers/tty/serial/stm32-usart.c              | 53 ++++++++++++++++---
 drivers/tty/serial/stm32-usart.h              |  8 +--
 5 files changed, 85 insertions(+), 14 deletions(-)