Re: [PATCH v1 1/2] dt-bindings: soc: samsung: usi: allow 64-bit address space

On 7/24/25 09:56, Krzysztof Kozlowski wrote:

On 23/07/2025 10:21, Ivaylo Ivanov wrote:

quoted

On 7/23/25 11:15, Krzysztof Kozlowski wrote:

quoted

On Tue, Jul 22, 2025 at 03:10:36PM +0300, Ivaylo Ivanov wrote:

quoted

Some device trees, like the exynos2200 one, configure the root node
with #address-cells and #size-cells set to 2. However, the usi binding
expects 32 bit address space only. Allow these determining properties to

So if USI expects 32 bit, then why do we allow 64?

Switching this to 2 means you use 64-bit addressing for children

I don't, but the main point was to avoid defining ranges for every single usi

I do not understand your "I don't", because you do.

I meant it in the "I don't _need_ to explicitly use that, but it's _nice_ to have"
way, so I don't have to clutter the nodes with address translations in ranges.

Best regards,
Ivaylo

 You change the child
address space to 64 bit and switch to 36/64 bit DMA. That's the meaning
of address cells 2.


Best regards,
Krzysztof