[RFT PATCH v3 24/27] tty: serial: samsung_tty: Add support for Apple UARTs

[Krzysztof Kozlowski]

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 at marcan.st>
> ---
>  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 at canonical.com>
Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski at canonical.com>

Best regards,
Krzysztof