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spi/bfin_spi: warn when CS is driven by hardware (CPHA=0)

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When the hardware is controlling the CS, there are some SPI options
we are unable to support.  So issue a warning in the hopes that the
user will change to a SPI mode where we can support things sanely.

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Barry Song 2010-04-06 03:36:24 +00:00 committed by Mike Frysinger
parent e72dcde72c
commit 4190f6a51f
1 changed files with 7 additions and 2 deletions
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9
drivers/spi/spi_bfin5xx.c
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@ -1040,9 +1040,14 @@ static int bfin_spi_setup(struct spi_device *spi)
*/
chip->baud = hz_to_spi_baud(spi->max_speed_hz);
chip->chip_select_num = spi->chip_select;
if (chip->chip_select_num < MAX_CTRL_CS)
if (chip->chip_select_num < MAX_CTRL_CS) {
if (!(spi->mode & SPI_CPHA))
dev_warn(&spi->dev, "Warning: SPI CPHA not set:"
" Slave Select not under software control!\n"
" See Documentation/blackfin/bfin-spi-notes.txt");
chip->flag = (1 << spi->chip_select) << 8;
else
} else
chip->cs_gpio = chip->chip_select_num - MAX_CTRL_CS;
if (chip->enable_dma && chip->pio_interrupt) {