SPI controller drivers: check for unsupported modes

[deliverable/linux.git] / drivers / spi / spi_s3c24xx.c

diff --git a/drivers/spi/spi_s3c24xx.c b/drivers/spi/spi_s3c24xx.c
index d5a710f6e445cf3aa0bf64e1fb1c6f5f827f50eb..7071ff8da63e47328fc55bab105a3e11ca27932d 100644 (file)
--- a/drivers/spi/spi_s3c24xx.c
+++ b/drivers/spi/spi_s3c24xx.c
@@ -146,6 +146,9 @@ static int s3c24xx_spi_setupxfer(struct spi_device *spi,
        return 0;
 }
 
+/* the spi->mode bits understood by this driver: */
+#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
+
 static int s3c24xx_spi_setup(struct spi_device *spi)
 {
        int ret;
@@ -153,8 +156,11 @@ static int s3c24xx_spi_setup(struct spi_device *spi)
        if (!spi->bits_per_word)
                spi->bits_per_word = 8;
 
-       if ((spi->mode & SPI_LSB_FIRST) != 0)
+       if (spi->mode & ~MODEBITS) {
+               dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
+                       spi->mode & ~MODEBITS);
                return -EINVAL;
+       }
 
        ret = s3c24xx_spi_setupxfer(spi, NULL);
        if (ret < 0) {