[U-Boot] [PATCH 18/31] iMX28: Add SPI driver

[Marek Vasut <marek.vasut@gmail.com>]

On Friday, September 09, 2011 10:51:17 AM Stefano Babic wrote:
> On 09/08/2011 10:42 PM, Marek Vasut wrote:
> > Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
> > Cc: Stefano Babic <sbabic@denx.de>
> > Cc: Wolfgang Denk <wd@denx.de>
> > Cc: Detlev Zundel <dzu@denx.de>
> > ---
> > 
> >  drivers/spi/Makefile  |    1 +
> >  drivers/spi/mxs_spi.c |  174
> >  +++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 175
> >  insertions(+), 0 deletions(-)
> >  create mode 100644 drivers/spi/mxs_spi.c
> > 
> > diff --git a/drivers/spi/mxs_spi.c b/drivers/spi/mxs_spi.c
> > new file mode 100644
> > index 0000000..b9c2f06
> > --- /dev/null
> > +++ b/drivers/spi/mxs_spi.c
> 
> Ok - now I am sure and I agree with your choice. Please then use mxs
> consequently in all files.
> 
> > @@ -0,0 +1,174 @@
> > +/*
> > + * Freescale i.MX28 SPI driver
> > + *
> > + * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
> > + * on behalf of DENX Software Engineering GmbH
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License as
> > + * published by the Free Software Foundation; either version 2 of
> > + * the License, or (at your option) any later version.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License
> > + * along with this program; if not, write to the Free Software
> > + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
> > + * MA 02111-1307 USA
> > + */
> > +
> > +#include <common.h>
> > +#include <malloc.h>
> > +#include <spi.h>
> > +#include <asm/errno.h>
> > +#include <asm/io.h>
> > +#include <asm/arch/clock.h>
> > +#include <asm/arch/regs-common.h>
> > +#include <asm/arch/regs-base.h>
> > +#include <asm/arch/regs-clkctrl.h>
> > +#include <asm/arch/regs-ssp.h>
> > +#include <asm/arch/iomux-mx28.h>
> > +#include <asm/arch/gpio.h>
> > +#include <asm/arch/mx28.h>
> 
> General comment: drop this stuff and include only imx-regs.h
> 
> > +
> > +#define	MXS_SPI_MAX_TIMEOUT	1000000
> > +
> > +static inline struct mx28_ssp_regs *to_mxs_regs(struct spi_slave *slave)
> > +{
> > +	return (struct mx28_ssp_regs *)(MXS_SSP0_BASE + (slave->bus * 0x2000));
> > +}
> > +
> > +void spi_init(void)
> > +{
> > +}
> > +
> > +struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
> > +				  unsigned int max_hz, unsigned int mode)
> > +{
> 
> Only the CS supplied in the SOC are supported, it is not possible to use
> a GPIO. Please add a comment to explain that.

I don't think I understand here.

> 
> Best regards,
> Stefano Babic