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spi/qspi: Add dual/quad spi read support

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Support for multiple lines in SPI framework has been picked[1].
[1]: http://comments.gmane.org/gmane.linux.kernel.spi.devel/14420

Hence, adapting ti qspi driver to support multiple data lines for read.

Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Sourav Poddar 2013-08-23 15:12:16 +05:30 committed by Mark Brown
parent 21e34a3306
commit 70e2e9761a
1 changed files with 12 additions and 1 deletions
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13
drivers/spi/spi-ti-qspi.c
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@ -267,7 +267,18 @@ static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t)
u8 *rxbuf;
rxbuf = t->rx_buf;
cmd = qspi->cmd | QSPI_RD_SNGL;
cmd = qspi->cmd;
switch (t->rx_nbits) {
case SPI_NBITS_DUAL:
cmd |= QSPI_RD_DUAL;
break;
case SPI_NBITS_QUAD:
cmd |= QSPI_RD_QUAD;
break;
default:
cmd |= QSPI_RD_SNGL;
break;
}
count = t->len;
wlen = t->bits_per_word;