Claude review: arm64: tegra: Enable DMA Support on Tegra194 QSPI

[Claude Code Review Bot <claude-review@example.com>]

Overall Series Review

Subject: arm64: tegra: Enable DMA Support on Tegra194 QSPI
Author: Aaron Kling via B4 Relay <devnull+webgeek1234.gmail.com@kernel.org>
Patches: 3
Reviewed: 2026-05-26T07:40:38.386949

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This is a 2-patch series that enables DMA support for the QSPI controllers on Tegra194 (Jetson Xavier NX). The first patch fixes the SPI driver to pass the DMA engine's `struct device` to DMA API calls instead of the SPI controller's device, ensuring the correct IOMMU mappings are used. The second patch adds the `dmas`/`dma-names` properties to the Tegra194 QSPI device tree nodes.

The approach is correct and follows established patterns. `dmaengine_get_dma_device()` is the standard API for obtaining the right device pointer for DMA API calls when a DMA engine is involved, and several other drivers in the tree use it similarly. The series addresses a real functional problem (PIO timeouts, CBB faults) and the v2 changes address previous review feedback cleanly. The DT change follows existing conventions in the same file.

I have a couple of minor observations but nothing blocking.

**Verdict: Series looks good overall.**

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