Re: [PATCH v2 1/4] dt-bindings: firmware: qcom,scm: Document that SCM can be dma-coherent

[Krzysztof Kozlowski]

On 16/06/2023 17:14, Douglas Anderson wrote:
> Trogdor devices use firmware backed by TF-A instead of Qualcomm's
> normal TZ. On TF-A we end up mapping memory as cacheable. Specifically,
> you can see in Trogdor's TF-A code [1] in qti_sip_mem_assign() that we
> call qti_mmap_add_dynamic_region() with MT_RO_DATA. This translates
> down to MT_MEMORY instead of MT_NON_CACHEABLE or MT_DEVICE.
> 
> Let's allow devices like trogdor to be described properly by allowing
> "dma-coherent" in the SCM node.
> 
> Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx

2

Best regards,
Krzysztof