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

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Message-ID: <cf7030d4-a686-4edd-9698-1a9c301d1dd0@gmail.com>
Date: Thu, 24 Jul 2025 10:02:00 +0300
From: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Alim Akhtar <alim.akhtar@...sung.com>,
 Sam Protsenko <semen.protsenko@...aro.org>, Rob Herring <robh@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, linux-samsung-soc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: 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:
>> On 7/23/25 11:15, Krzysztof Kozlowski wrote:
>>> On Tue, Jul 22, 2025 at 03:10:36PM +0300, Ivaylo Ivanov wrote:
>>>> 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