[PATCH 3.12 039/142] spi: orion: fix incorrect handling of cell-index DT property

From: Jiri Slaby
Date: Fri Sep 26 2014 - 06:28:17 EST

From: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>

3.12-stable review patch. If anyone has any objections, please let me know.


commit e06871cd2c92e5c65d7ca1d32866b4ca5dd4ac30 upstream.

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

Fixes: f814f9ac5a81 ("spi/orion: add device tree binding")
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
drivers/spi/spi-orion.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-orion.c b/drivers/spi/spi-orion.c
index 1d1d321d90c4..72006e63d513 100644
--- a/drivers/spi/spi-orion.c
+++ b/drivers/spi/spi-orion.c
@@ -404,8 +404,6 @@ 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) {
@@ -416,10 +414,10 @@ 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 */

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