On 26/08/2013 17:45, Marek Vasut wrote: > The chipselect must be written into the CTRL0 register after the SSP > block is reset, otherwise the block will always use ChipSelect #0. > > Signed-off-by: Marek Vasut <ma...@denx.de> > Cc: Fabio Estevam <fabio.este...@freescale.com> > Cc: Jagannadha Sutradharudu Teki <jagannadh.t...@gmail.com> > Cc: Otavio Salvador <ota...@ossystems.com.br> > Cc: Stefano Babic <sba...@denx.de> > --- > drivers/spi/mxs_spi.c | 12 +++--------- > 1 file changed, 3 insertions(+), 9 deletions(-) > > V2: Clean up a warning that "ssp_regs" are not used > > diff --git a/drivers/spi/mxs_spi.c b/drivers/spi/mxs_spi.c > index 3cf7142..2b9f395 100644 > --- a/drivers/spi/mxs_spi.c > +++ b/drivers/spi/mxs_spi.c > @@ -56,8 +56,6 @@ struct spi_slave *spi_setup_slave(unsigned int bus, > unsigned int cs, > unsigned int max_hz, unsigned int mode) > { > struct mxs_spi_slave *mxs_slave; > - struct mxs_ssp_regs *ssp_regs; > - int reg; > > if (!spi_cs_is_valid(bus, cs)) { > printf("mxs_spi: invalid bus %d / chip select %d\n", bus, cs); > @@ -74,13 +72,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus, > unsigned int cs, > mxs_slave->max_khz = max_hz / 1000; > mxs_slave->mode = mode; > mxs_slave->regs = mxs_ssp_regs_by_bus(bus); > - ssp_regs = mxs_slave->regs; > > - reg = readl(&ssp_regs->hw_ssp_ctrl0); > - reg &= ~(MXS_SSP_CHIPSELECT_MASK); > - reg |= cs << MXS_SSP_CHIPSELECT_SHIFT; > - > - writel(reg, &ssp_regs->hw_ssp_ctrl0); > return &mxs_slave->slave; > > err_init: > @@ -102,7 +94,9 @@ int spi_claim_bus(struct spi_slave *slave) > > mxs_reset_block(&ssp_regs->hw_ssp_ctrl0_reg); > > - writel(SSP_CTRL0_BUS_WIDTH_ONE_BIT, &ssp_regs->hw_ssp_ctrl0); > + writel((slave->cs << MXS_SSP_CHIPSELECT_SHIFT) | > + SSP_CTRL0_BUS_WIDTH_ONE_BIT, > + &ssp_regs->hw_ssp_ctrl0); > > reg = SSP_CTRL1_SSP_MODE_SPI | SSP_CTRL1_WORD_LENGTH_EIGHT_BITS; > reg |= (mxs_slave->mode & SPI_CPOL) ? SSP_CTRL1_POLARITY : 0; >
Acked-by: Stefano Babic <sba...@denx.de> Best regards, Stefano Babic -- ===================================================================== DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sba...@denx.de ===================================================================== _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot