Re: [PATCH 29/30] dt-bindings: spi: dw: Add Baikal-T1 SPI Controllers

[Rob Herring <robh@xxxxxxxxxx>]

On Sun, 20 Sep 2020 14:29:13 +0300, Serge Semin wrote:
> These controllers are based on the DW APB SSI IP-core and embedded into
> the SoC, so two of them are equipped with IRQ, DMA, 64 words FIFOs and 4
> native CS, while another one as being utilized by the Baikal-T1 System
> Boot Controller has got a very limited resources: no IRQ, no DMA, only a
> single native chip-select and just 8 bytes Tx/Rx FIFOs available. That's
> why we have to mark the IRQ to be optional for the later interface.
> 
> The SPI controller embedded into the Baikal-T1 System Boot Controller can
> be also used to directly access an external SPI flash by means of a
> dedicated FSM. The corresponding MMIO region availability is switchable by
> the embedded multiplexor, which phandle can be specified in the dts node.
> 
> * We added a new example to test out the non-standard Baikal-T1 System
> Boot SPI Controller DT binding.
> 
> Co-developed-by: Ramil Zaripov <Ramil.Zaripov@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Ramil Zaripov <Ramil.Zaripov@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>
> ---
>  .../bindings/spi/snps,dw-apb-ssi.yaml         | 33 +++++++++++++++++--
>  1 file changed, 31 insertions(+), 2 deletions(-)
> 

Reviewed-by: Rob Herring <robh@xxxxxxxxxx>