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

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Message-ID: <20250723-hypnotic-malkoha-of-trust-9efdb6@kuoka>
Date: Wed, 23 Jul 2025 10:15:12 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
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 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 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