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spi: orion: fix incorrect handling of cell-index DT property

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In commit f814f9ac5a ("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: f814f9ac5a ("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+
This commit is contained in:
Thomas Petazzoni 2014-07-27 23:53:19 +02:00 committed by Mark Brown
parent 7171511eae
commit e06871cd2c
1 changed files with 4 additions and 6 deletions
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10
drivers/spi/spi-orion.c
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@ -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 */