Antwort: Re: nor flash board init code

[christian.buettner@rafi.de]

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Thanks for the code!

Here is my approach:

const struct flash_platform_data tx53_flash = {
    .type       = "mx25l8005",
    .name       = "spi_flash",
};


//MX25L8005MC-15G
static const struct spi_board_info mx53_spi_board_info[] = {
        {
                .name = "mx25l8005",
                .max_speed_hz = 70000000,
                .bus_num = 0,
                .chip_select = 0,
                .bits_per_word = 8,
                .mode = SPI_MODE_0,
                .platform_data = &tx53_flash,
        },
};

static struct spi_imx_master tx53_spi = {
                .num_chipselect = 1,
};


init_devices {

...
    spi_register_board_info(mx53_spi_board_info,
                    ARRAY_SIZE(mx53_spi_board_info));

    add_generic_device("m25p",-1,"m25p",MX53_ECSPI1_BASE_ADDR,64 * 
1024,IORESOURCE_MEM,&mx53_spi_board_info);

...
}


When the m25p80.c driver probes i get no spi instance:

static int m25p_probe(struct device_d *dev) {
        struct spi_device *spi = (struct spi_device *)dev->type_data;
        const struct spi_device_id      *id = NULL;
...
}

struct spi_device *spi is always null

Whats wrong here?

christian



Von:    Franck Jullien <franck.jullien@gmail.com>
An:     christian.buettner@rafi.de, 
Kopie:  barebox@lists.infradead.org
Datum:  27.07.2012 13:33
Betreff:        Re: nor flash board init code



2012/7/25 <christian.buettner@rafi.de>
>
> hi all,
> is there any example board init code to load the mx25l8005 spi nor-flash 
through the imx53 (TX53 from KARO)?
> I want to use the m25p80 driver to read and write.
>
> christian
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox
>

Hi Christian,

This is what I use with the Altera SPI controller + an SPI flash device:

http://www.elec4fun.fr/index.php?option=com_content&view=article&id=10&Itemid=153


static struct spi_altera_master altera_spi_0_data = {
      .num_chipselect = 1,
      .spi_mode = 0,      /* SPI mode of the EPCS flash controller */
      .databits = 8,      /* Data length of the EPCS flash controller */
      .speed = 20000000,  /* EPCS flash controller speed */
};


static struct flash_platform_data epcs_flash = {
      .name = "epcs",    /* Cdev name, optional */
      .type = "m25p40",  /* Device type, required for non JEDEC chips */
};

static struct spi_board_info generic_spi_board_info[] = {
      {
            .name = "m25p",
            .max_speed_hz = 20000000,
            .bus_num = 0,
            .chip_select = 0,
            .bits_per_word = 8,
            .mode = SPI_MODE_0,
            .platform_data = &epcs_flash,
      }
};

static int myboard_devices_init(void) {

...

spi_register_board_info(myboard_spi_board_info,
ARRAY_SIZE(myboard_spi_board_info));

add_generic_device("altera_spi", -1, NULL, NIOS_SOPC_EPCS_BASE, 0x18,
                    IORESOURCE_MEM, &altera_spi_0_data);

...

Franck.


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