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>

drivers/spi/spi_bfin5xx.c

@@ -1108,6 +1108,8 @@ static int bfin_spi_setup(struct spi_device *spi)
 	}
 
 	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);
 			if (ret) {
 				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);
 		}
+	}
 
 	dev_dbg(&spi->dev, "setup spi chip %s, width is %d, dma is %d\n",
 			spi->modalias, spi->bits_per_word, chip->enable_dma);