From: Thierry Reding <thierry.reding@gmail.com>
To: webgeek1234@gmail.com
Cc: Mark Brown <broonie@kernel.org>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Thierry Reding <thierry.reding@kernel.org>,
Jonathan Hunter <jonathanh@nvidia.com>,
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
Date: Wed, 20 May 2026 13:34:02 +0200 [thread overview]
Message-ID: <ag2bxqDmZsCuOfOJ@orome> (raw)
In-Reply-To: <20260515-tegra194-qspi-iommu-v1-1-57dfb63cd3d6@gmail.com>
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On Fri, May 15, 2026 at 03:35:27PM -0500, Aaron Kling via B4 Relay wrote:
> From: Aaron Kling <webgeek1234@gmail.com>
>
> 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.
Thierry
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next prev parent reply other threads:[~2026-05-20 11:34 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-15 20:35 [PATCH 0/3] arm64: tegra: Add iommu and dma properties for Tegra194 QSPI Aaron Kling via B4 Relay
2026-05-15 20:35 ` [PATCH 1/3] spi: dt-bindings: tegra: Support IOMMU property " Aaron Kling via B4 Relay
2026-05-15 20:43 ` sashiko-bot
2026-05-16 10:13 ` Krzysztof Kozlowski
2026-05-20 11:34 ` Thierry Reding [this message]
2026-05-15 20:35 ` [PATCH 2/3] spi: dt-bindings: tegra: Support dma-coherent property for QSPI Aaron Kling via B4 Relay
2026-05-15 20:51 ` sashiko-bot
2026-05-16 10:13 ` Krzysztof Kozlowski
2026-05-20 11:46 ` Thierry Reding
2026-05-15 20:35 ` [PATCH 3/3] arm64: tegra: Add iommu and dma properties for Tegra194 QSPI Aaron Kling via B4 Relay
2026-05-15 21:17 ` sashiko-bot
2026-05-20 11:49 ` Thierry Reding
2026-05-20 17:29 ` Aaron Kling
2026-05-19 14:43 ` [PATCH 0/3] " Jon Hunter
2026-05-19 15:50 ` Jon Hunter
2026-05-19 16:48 ` Aaron Kling
2026-05-19 18:36 ` Jon Hunter
2026-05-19 19:34 ` Jon Hunter
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