[U-Boot] SPI - cs validity

[Ran Shalit]

> It seems that currently both atmel & davinci boards supports only 1 spi
> instance at a time.
>
> In order to support different spi instances,
> In case of atmel declare SPIx_BASE as required & set CONFIG_DEFAULT_SPI_BUS
> to required bus
> In case of davinci set CONFIG_SYS_SPI_BASE to base address of required spi
> instance
>
> Also, spi_cs_is_valid() function needs to be updated to support different
> spi instances. spi_cs_is_valid() function is board dependednt.
>
> Hope this helps.
>
> Regards,
> Gururaja
>


Hi Gururaja,

It seems that the implementation limit the validity only for bus==0. This
means that trying other bus(=spi port ?)  will fail even if its not at the
same time. In addition to that the CPU's data sheet make no limit.

Best Regards,
Ran