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Document the boundary between SPI/SSI controller models and SPI flash models when representing fast-read dummy cycles. It explains that flash models own command semantics, while controllers own hardware-generated dummy transfers and cycle-to-byte conversion. Signed-off-by: Bin Meng <bin.meng@processmission.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com> Message-ID: <20260707083431.219671-11-bin.meng@processmission.com> [PMD: Update MAINTAINERS] Signed-off-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>