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spi/bfin_spi: only request GPIO on first load

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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>
This commit is contained in:
Michael Hennerich 2010-10-22 02:01:47 -04:00 • committed by Grant Likely
parent 782a895693
commit 73e1ac1625
1 changed files with 8 additions and 5 deletions
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3
drivers/spi/spi_bfin5xx.c
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@ -1108,6 +1108,8 @@ static int bfin_spi_setup(struct spi_device *spi)
} }
if (chip->chip_select_num >= MAX_CTRL_CS) { if (chip->chip_select_num >= MAX_CTRL_CS) {
/* Only request on first setup */
if (spi_get_ctldata(spi) == NULL) {
ret = gpio_request(chip->cs_gpio, spi->modalias); ret = gpio_request(chip->cs_gpio, spi->modalias);
if (ret) { if (ret) {
dev_err(&spi->dev, "gpio_request() error\n"); dev_err(&spi->dev, "gpio_request() error\n");
@ -1115,6 +1117,7 @@ static int bfin_spi_setup(struct spi_device *spi)
} }
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", dev_dbg(&spi->dev, "setup spi chip %s, width is %d, dma is %d\n",
spi->modalias, spi->bits_per_word, chip->enable_dma); spi->modalias, spi->bits_per_word, chip->enable_dma);