diff options
| author | Michael Hennerich <michael.hennerich@analog.com> | 2010-10-22 02:01:47 -0400 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2010-10-22 01:26:46 -0600 |
| commit | 73e1ac16258fe7e55cce4691e32c0b44d4579e08 (patch) | |
| tree | aaa8fe91c600c5c07fdc105ba65dee42192dc4cf | |
| parent | 782a895693a52fd8b288c33bdd7e98357888fc1f (diff) | |
| download | talos-op-linux-73e1ac16258fe7e55cce4691e32c0b44d4579e08.tar.gz talos-op-linux-73e1ac16258fe7e55cce4691e32c0b44d4579e08.zip | |
spi/bfin_spi: only request GPIO on first load
The gpiolib code does not allow people to do gpio_request() on a GPIO
once it has already been requested. So make sure we only request the
pin on the first setup of a SPI device. Otherwise, if you attempts to
reconfigure a SPI device on the fly (like change bit sizes), the setup
function incorrectly fails.
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
| -rw-r--r-- | drivers/spi/spi_bfin5xx.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index d3da41d3f92d..3f223511127b 100644 --- a/drivers/spi/spi_bfin5xx.c +++ b/drivers/spi/spi_bfin5xx.c @@ -1108,12 +1108,15 @@ static int bfin_spi_setup(struct spi_device *spi) } if (chip->chip_select_num >= MAX_CTRL_CS) { - ret = gpio_request(chip->cs_gpio, spi->modalias); - if (ret) { - dev_err(&spi->dev, "gpio_request() error\n"); - goto pin_error; + /* Only request on first setup */ + if (spi_get_ctldata(spi) == NULL) { + ret = gpio_request(chip->cs_gpio, spi->modalias); + if (ret) { + dev_err(&spi->dev, "gpio_request() error\n"); + goto pin_error; + } + gpio_direction_output(chip->cs_gpio, 1); } - gpio_direction_output(chip->cs_gpio, 1); } dev_dbg(&spi->dev, "setup spi chip %s, width is %d, dma is %d\n", |
