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spi/bfin_spi: warn when CS is driven by hardware (CPHA=0)
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>
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1 changed files with 7 additions and 2 deletions
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@ -1040,9 +1040,14 @@ static int bfin_spi_setup(struct spi_device *spi)
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*/
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chip->baud = hz_to_spi_baud(spi->max_speed_hz);
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chip->chip_select_num = spi->chip_select;
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if (chip->chip_select_num < MAX_CTRL_CS)
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if (chip->chip_select_num < MAX_CTRL_CS) {
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if (!(spi->mode & SPI_CPHA))
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dev_warn(&spi->dev, "Warning: SPI CPHA not set:"
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" Slave Select not under software control!\n"
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" See Documentation/blackfin/bfin-spi-notes.txt");
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chip->flag = (1 << spi->chip_select) << 8;
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else
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} else
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chip->cs_gpio = chip->chip_select_num - MAX_CTRL_CS;
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if (chip->enable_dma && chip->pio_interrupt) {
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