diff options
| author | Andreas Larsson <andreas@gaisler.com> | 2013-02-13 14:20:25 +0100 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2013-04-07 11:12:20 +0200 |
| commit | 446411e18b2cb17d153e45f634a3c9a79ada3ac2 (patch) | |
| tree | d0b227257591b9a010d453bef1bd2645901e3f0d /include | |
| parent | spi/atmel: fix speed_hz check in atmel_spi_transfer() (diff) | |
| download | linux-446411e18b2cb17d153e45f634a3c9a79ada3ac2.tar.xz linux-446411e18b2cb17d153e45f634a3c9a79ada3ac2.zip | |
spi: Initialize cs_gpio and cs_gpios with -ENOENT
The return value from of_get_named_gpio is -ENOENT when the given index
matches a hole in the "cs-gpios" property phandle list. However, the
default value of cs_gpio in struct spi_device and entries of cs_gpios in
struct spi_master is -EINVAL, which is documented to indicate that a
GPIO line should not be used for the given spi_device.
This sets the default value of cs_gpio in struct spi_device and entries
of cs_gpios in struct spi_master to -ENOENT. Thus, -ENOENT is the only
value used to indicate that no GPIO line should be used.
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/spi/spi.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 38c2b925923d..c395f32b53b3 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -57,7 +57,7 @@ extern struct bus_type spi_bus_type; * @modalias: Name of the driver to use with this device, or an alias * for that name. This appears in the sysfs "modalias" attribute * for driver coldplugging, and in uevents used for hotplugging - * @cs_gpio: gpio number of the chipselect line (optional, -EINVAL when + * @cs_gpio: gpio number of the chipselect line (optional, -ENOENT when * when not using a GPIO line) * * A @spi_device is used to interchange data between an SPI slave @@ -261,7 +261,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv) * queue so the subsystem notifies the driver that it may relax the * hardware by issuing this call * @cs_gpios: Array of GPIOs to use as chip select lines; one per CS - * number. Any individual value may be -EINVAL for CS lines that + * number. Any individual value may be -ENOENT for CS lines that * are not GPIOs (driven by the SPI controller itself). * * Each SPI master controller can communicate with one or more @spi_device |