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[2003:e4:1f29:1e00:f22f:74ff:fe1f:3a53]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45da0fe0f72sm56958318f8f.25.2026.05.20.04.34.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 May 2026 04:34:04 -0700 (PDT) Date: Wed, 20 May 2026 13:34:02 +0200 From: Thierry Reding To: webgeek1234@gmail.com Cc: Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thierry Reding , Jonathan Hunter , linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/3] spi: dt-bindings: tegra: Support IOMMU property for Tegra194 QSPI Message-ID: References: <20260515-tegra194-qspi-iommu-v1-0-57dfb63cd3d6@gmail.com> <20260515-tegra194-qspi-iommu-v1-1-57dfb63cd3d6@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="lkhs67mbj3gk5ko5" Content-Disposition: inline In-Reply-To: <20260515-tegra194-qspi-iommu-v1-1-57dfb63cd3d6@gmail.com> --lkhs67mbj3gk5ko5 Content-Type: text/plain; protected-headers=v1; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH 1/3] spi: dt-bindings: tegra: Support IOMMU property for Tegra194 QSPI MIME-Version: 1.0 On Fri, May 15, 2026 at 03:35:27PM -0500, Aaron Kling via B4 Relay wrote: > From: Aaron Kling >=20 > This is supported via an external dma controller You say this yourself: it's supported via an external controller, therefore the QSPI controller on Tegra194 (and earlier) does not need the iommus property because it does not itself perform the DMA. The GPC DMA has the iommus property, QSPI doesn't need it. This is different on Tegra234 and later where the QSPI has a built-in DMA controller and does not rely on GPC DMA any longer. 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