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 <marcan@xxxxxxxxx> > --- > 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 <krzysztof.kozlowski@xxxxxxxxxxxxx> Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx> Best regards, Krzysztof
