[U-Boot] [PATCH] arm: socfpga: Add example config entry for EPCS/EPCQ SPI

[Marek Vasut <marex@denx.de>]

On Friday, October 31, 2014 at 08:09:21 AM, Jagan Teki wrote:
> On 30 October 2014 22:59, Marek Vasut <marex@denx.de> wrote:
> > On Thursday, October 30, 2014 at 03:38:40 PM, Jagan Teki wrote:
> >> On 30 October 2014 15:00, Marek Vasut <marex@denx.de> wrote:
> >> > Add example config file entry for the Altera SPI controller. This SPI
> >> > controller can also, under special conditions, be used to operate the
> >> > EPCS/EPCQ SPI NOR.
> >> > 
> >> > Signed-off-by: Marek Vasut <marex@denx.de>
> >> > Cc: Chin Liang See <clsee@altera.com>
> >> > Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
> >> > Cc: Vince Bridgers <vbridger@altera.com>
> >> > Cc: Pavel Machek <pavel@denx.de>
> >> > Cc: Stefan Roese <sr@denx.de>
> >> > ---
> >> > 
> >> >  include/configs/socfpga_common.h | 19 +++++++++++++++++++
> >> >  1 file changed, 19 insertions(+)
> >> > 
> >> > diff --git a/include/configs/socfpga_common.h
> >> > b/include/configs/socfpga_common.h index 83a1bcd..1df886b 100644
> >> > --- a/include/configs/socfpga_common.h
> >> > +++ b/include/configs/socfpga_common.h
> >> > @@ -79,6 +79,25 @@
> >> > 
> >> >  #define CONFIG_SYS_PL310_BASE          SOCFPGA_MPUL2_ADDRESS
> >> >  
> >> >  /*
> >> > 
> >> > + * EPCS/EPCQx1 Serial Flash Controller
> >> > + */
> >> > +#ifdef CONFIG_ALTERA_SPI
> >> > +#define CONFIG_CMD_SPI
> >> > +#define CONFIG_CMD_SF
> >> > +#define CONFIG_SF_DEFAULT_SPEED                30000000
> >> > +#define CONFIG_SPI_FLASH
> >> > +#define CONFIG_SPI_FLASH_STMICRO
> >> > +#define CONFIG_SPI_FLASH_BAR
> >> > +/*
> >> > + * The base address is configurable in QSys, each board must specify
> >> > the + * base address based on it's particular FPGA configuration.
> >> > Please note + * that the address here is incremented by  0x400  from
> >> > the Base address + * selected in QSys, since the SPI registers are at
> >> > offset +0x400. + * #define CONFIG_SYS_SPI_BASE         0xff240400
> >> 
> >> So each board-specific config header will define CONFIG_SYS_SPI_BASE is
> >> it? for using ALTERA_SPI
> > 
> > Yes, the address is not fixed, since this is FPGA IP.
> 
> May be use conditional ifdef with CONFIG_SYS_SPI_BASE instead of
> CONFIG_ALTERA_SPI
> so who ever use SPI on their board will define CONFIG_SYS_SPI_BASE config.

You can have different SPI controllers enabled on the SoCFPGA, so enabling
CONFIG_ALTERA_SPI explicitly in case CONFIG_SYS_SPI_BASE is defined is a very
bad idea.

Best regards,
Marek Vasut