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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2014-07-27 23:53:19 +0200
committerMark Brown <broonie@linaro.org>2014-07-28 22:30:43 +0100
commite06871cd2c92e5c65d7ca1d32866b4ca5dd4ac30 (patch)
treef29742cee9356fa0883df89eba0473207832bb62 /drivers/spi
parent7171511eaec5bf23fb06078f59784a3a0626b38f (diff)
downloadlinux-e06871cd2c92e5c65d7ca1d32866b4ca5dd4ac30.tar.bz2
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')
-rw-r--r--drivers/spi/spi-orion.c10
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 */