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| author | Mika Westerberg <mika.westerberg@iki.fi> | 2011-05-29 13:10:06 +0300 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2011-06-08 15:46:12 -0600 |
| commit | 626a96db11698119a67eeda130488e869aa6f14e (patch) | |
| tree | 1d5fd7da4a7919596bd81e0136d96679196e1152 /Documentation/spi | |
| parent | 71cebd700257a4f644066631bf02187d8f67817e (diff) | |
| download | lwn-626a96db11698119a67eeda130488e869aa6f14e.tar.gz lwn-626a96db11698119a67eeda130488e869aa6f14e.zip | |
spi/ep93xx: add DMA support
This patch adds DMA support for the EP93xx SPI driver. By default the DMA is
not enabled but it can be enabled by setting ep93xx_spi_info.use_dma to true
in board configuration file.
Note that the SPI driver still uses PIO for small transfers (<= 8 bytes) for
performance reasons.
Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi>
Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'Documentation/spi')
| -rw-r--r-- | Documentation/spi/ep93xx_spi | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/spi/ep93xx_spi b/Documentation/spi/ep93xx_spi index 6325f5b48635..d8eb01c15db1 100644 --- a/Documentation/spi/ep93xx_spi +++ b/Documentation/spi/ep93xx_spi @@ -88,6 +88,16 @@ static void __init ts72xx_init_machine(void) ARRAY_SIZE(ts72xx_spi_devices)); } +The driver can use DMA for the transfers also. In this case ts72xx_spi_info +becomes: + +static struct ep93xx_spi_info ts72xx_spi_info = { + .num_chipselect = ARRAY_SIZE(ts72xx_spi_devices), + .use_dma = true; +}; + +Note that CONFIG_EP93XX_DMA should be enabled as well. + Thanks to ========= Martin Guy, H. Hartley Sweeten and others who helped me during development of |