linux-kernel - Re: [RESEND] spi: davinci: Allow device tree devices to use DMA

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Message-ID: <m24m146jzh.fsf@baylibre.com>
Date:   Thu, 12 Jan 2017 13:34:10 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     David Lechner <david@...hnology.com>
Cc:     Mark Brown <broonie@...nel.org>, nsekhar@...com,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RESEND] spi: davinci: Allow device tree devices to use DMA

David Lechner <david@...hnology.com> writes:

> This allows SPI devices specified in a device tree to use DMA when the
> master controller.

Enabling DMA for spi-davinci isn't quite ready yet since this driver is
blindly using dma_map_single() on addresses passed in.  MTD seems to use
vmalloc'd buffers, which cannot be passed direclty to dma_map_single().

I thinks this driver needs an update to use spi_map_buf() to be able to
handle vmalloc'd buffers before always enabling DMA.

Kevin