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[91.139.201.119]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4586ec79441sm9982835e9.2.2025.07.24.00.02.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 24 Jul 2025 00:02:02 -0700 (PDT) Message-ID: Date: Thu, 24 Jul 2025 10:02:00 +0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 1/2] dt-bindings: soc: samsung: usi: allow 64-bit address space Content-Language: en-US To: Krzysztof Kozlowski Cc: Krzysztof Kozlowski , Alim Akhtar , Sam Protsenko , Rob Herring , Conor Dooley , linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20250722121037.443385-1-ivo.ivanov.ivanov1@gmail.com> <20250723-hypnotic-malkoha-of-trust-9efdb6@kuoka> <3e1d7be9-e99f-41c3-8b0d-aaa426aa9de8@gmail.com> From: Ivaylo Ivanov In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250724_000205_215466_52A39D95 X-CRM114-Status: GOOD ( 13.60 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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