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| author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2014-07-27 23:53:19 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-07-28 22:30:43 +0100 |
| commit | e06871cd2c92e5c65d7ca1d32866b4ca5dd4ac30 (patch) | |
| tree | f29742cee9356fa0883df89eba0473207832bb62 /drivers/spi/spi-orion.c | |
| parent | 7171511eaec5bf23fb06078f59784a3a0626b38f (diff) | |
| download | lwn-e06871cd2c92e5c65d7ca1d32866b4ca5dd4ac30.tar.gz lwn-e06871cd2c92e5c65d7ca1d32866b4ca5dd4ac30.zip | |
spi: orion: fix incorrect handling of cell-index DT property
In commit f814f9ac5a81 ("spi/orion: add device tree binding"), Device
Tree support was added to the spi-orion driver. However, this commit
reads the "cell-index" property, without taking into account the fact
that DT properties are big-endian encoded.
Since most of the platforms using spi-orion with DT have apparently
not used anything but cell-index = <0>, the problem was not
visible. But as soon as one starts using cell-index = <1>, the problem
becomes clearly visible, as the master->bus_num gets a wrong value
(actually it gets the value 0, which conflicts with the first bus that
has cell-index = <0>).
This commit fixes that by using of_property_read_u32() to read the
property value, which does the appropriate endianness conversion when
needed.
Fixes: f814f9ac5a81 ("spi/orion: add device tree binding")
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Cc: <stable@vger.kernel.org> # v3.6+
Diffstat (limited to 'drivers/spi/spi-orion.c')
| -rw-r--r-- | drivers/spi/spi-orion.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/spi/spi-orion.c b/drivers/spi/spi-orion.c index d018a4aac3a1..c206a4ad83cd 100644 --- a/drivers/spi/spi-orion.c +++ b/drivers/spi/spi-orion.c @@ -346,8 +346,6 @@ static int orion_spi_probe(struct platform_device *pdev) struct resource *r; unsigned long tclk_hz; int status = 0; - const u32 *iprop; - int size; master = spi_alloc_master(&pdev->dev, sizeof(*spi)); if (master == NULL) { @@ -358,10 +356,10 @@ static int orion_spi_probe(struct platform_device *pdev) if (pdev->id != -1) master->bus_num = pdev->id; if (pdev->dev.of_node) { - iprop = of_get_property(pdev->dev.of_node, "cell-index", - &size); - if (iprop && size == sizeof(*iprop)) - master->bus_num = *iprop; + u32 cell_index; + if (!of_property_read_u32(pdev->dev.of_node, "cell-index", + &cell_index)) + master->bus_num = cell_index; } /* we support only mode 0, and no options */ |