Re: [Xen-devel] [PATCH V4 2/5] xen/arm: drivers: scif: Extend driver to handle other interfaces

[Julien Grall <julien.grall@xxxxxxx>]

Hi Oleksandr,

On 17/04/2019 15:59, Oleksandr Tyshchenko wrote:
> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
>
> Extend driver to be able to handle other SCIF(X) compatible
> interfaces as well. These interfaces have lot in common,
> but mostly differ in offsets and bits for some registers.
>
> For example, the main difference between SCIF and SCIFA interfaces
> from "scif-uart" driver's point of view:
> - Registers offset: serial status, receive/transmit FIFO data
>    registers have different offset
> - Internal FIFO size: 64 bytes for SCIFA and 16 bytes for SCIF
> - Overrun bit location: serial status register for SCIFA and
>    dedicated line status register for SCIF
>
> Introduce "port_params" array to keep interface specific things.
>
> The "data" field in struct dt_device_match is used for recognizing
> what interface is present on a target board.
>
> Please note, nothing has been technically changed for Renesas "Lager"
> and other supported boards (SCIF).
>
> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
> CC: Julien Grall <julien.grall@xxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxx>

Cheers,

--
Julien Grall

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