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

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Message-ID: <3e1d7be9-e99f-41c3-8b0d-aaa426aa9de8@gmail.com>
Date: Wed, 23 Jul 2025 11:21:35 +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 7/23/25 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
node, because they are a lot.

Best regards,
Ivaylo

>  and
> allowing DMA for >32 bit. This should be the true reason - what is the
> address space and DMA range for children?
>
> Best regards,
> Krzysztof
>