Re: [PATCH 1/3] spi: dt-bindings: tegra: Support IOMMU property for Tegra194 QSPI

[Thierry Reding]

On Fri, May 15, 2026 at 03:35:27PM -0500, Aaron Kling via B4 Relay wrote:
> From: Aaron Kling <webgeek1234@xxxxxxxxx>
> 
> 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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