On 04/03/2021 22:38, Hector Martin wrote:

Apple SoCs are a distant descendant of Samsung designs and use yet
another variant of their UART style, with different interrupt handling.

In particular, this variant has the following differences with existing
ones:

* It includes a built-in interrupt controller with different registers,
  using only a single platform IRQ

* Internal interrupt sources are treated as edge-triggered, even though
  the IRQ output is level-triggered. This chiefly affects the TX IRQ
  path: the driver can no longer rely on the TX buffer empty IRQ
  immediately firing after TX is enabled, but instead must prime the
  FIFO with data directly.

Signed-off-by: Hector Martin <redacted>
---
 drivers/tty/serial/Kconfig       |   2 +-
 drivers/tty/serial/samsung_tty.c | 238 +++++++++++++++++++++++++++++--
 include/linux/serial_s3c.h       |  16 +++
 3 files changed, 247 insertions(+), 9 deletions(-)

Reviewed-by: Krzysztof Kozlowski <redacted>
Tested-by: Krzysztof Kozlowski <redacted>

Best regards,
Krzysztof

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