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authorDavid Brownell <dbrownell@users.sourceforge.net>2009-06-30 11:41:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-30 18:56:00 -0700
commit70d6027ff2bc8bab180273b77e7ab3e8a62cca51 (patch)
tree1b8e13ffd71c587dcff60933d69a9ff2edb60f0d /drivers/spi
parentb55f627feeb9d48fdbde3835e18afbc76712e49b (diff)
spi: add spi_master flag word
Add a new spi_master.flags word listing constraints relevant to that controller. Define the first constraint bit: a half duplex restriction. Include that constraint in the OMAP1 MicroWire controller driver. Have the mmc_spi host be the first customer of this flag. Its coding relies heavily on full duplex transfers, so it must fail when the underlying controller driver won't perform them. (The spi_write_then_read routine could use it too: use the temporarily-withdrawn full-duplex speedup unless this flag is set, in which case the existing code applies. Similarly, any spi_master implementing only SPI_3WIRE should set the flag.) Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/omap_uwire.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/spi/omap_uwire.c b/drivers/spi/omap_uwire.c
index aa90ddb3706..8980a5640bd 100644
--- a/drivers/spi/omap_uwire.c
+++ b/drivers/spi/omap_uwire.c
@@ -514,6 +514,8 @@ static int __init uwire_probe(struct platform_device *pdev)
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
+ master->flags = SPI_MASTER_HALF_DUPLEX;
+
master->bus_num = 2; /* "official" */
master->num_chipselect = 4;
master->setup = uwire_setup;