Re: [PATCH 1/2 (for-next)] ARM: OMAP3: Add support for the IGEP v2 board (rev B)

["Frédéric BEGOU" <fbegou@sios.fr>]

Frédéric BEGOU wrote :
> Frédéric BEGOU wrote:
>
>    Hello,
>
>     
>    For what I've seen on the Internet concerning your card, there is
>    only one MMC card reader.
>
>    Besides, there is the following piece of code :
>
>     
>        +static struct twl4030_hsmmc_info mmc[] = {
>        +       {
>        +               .mmc            = 1,
>        +               .wires          = 4,
>        +               .gpio_cd        = -EINVAL,
>        +               .gpio_wp        = -EINVAL,
>        +       },
>        +       {
>        +               .mmc            = 2,
>        +               .wires          = 4,
>        +               .gpio_cd        = -EINVAL,
>        +               .gpio_wp        = -EINVAL,
>        +       },
>        +       {}      /* Terminator */
>        +};
>           
>    Maybe I am mistaken, but doesn't that mean there are two MMC cards ?
>
>     
>    I am interested in the subject, as I am trying to write my own board
>    file for our custom, beagleboard-based card, with no success so far
>    concerning the second MMC reader...
>
> Well, it seems that the board is question has a WIFI module connected 
> to the second mmc. What is your problem right now ? Remember that all 
> three MMC slots are different in what kind of voltage they can drive.
>
Hello,

OK I understand for your board.

I have my second MMC slot wired just like MMC1 : they are micro-SD slots 
wired with
- MMC2_CLK
- MMC2_CMD
- MMC2_DATA0
- MMC2_DATA1
- MMC2_DATA2
- MMC2_DATA3 , all 6 wired with a 4.7Kohm resistor to VMMC2 ;

VDD wired to VMMC2 and VSS to ground.
Add a capacitor between VMMC2 and the ground for the taste !

VMMC2 is 3.3V.

I've tested with a different combination of parameters in the 
twl4030_hsmmc_info structure in my board file, and now I'm stuck with 
the following :

static struct twl4030_hsmmc_info mmc[] = {
        {
                .mmc            = 1,
                .wires          = 4,
                .gpio_wp        = -EINVAL,
        },
        {
                .mmc            = 2,
                .wires          = 4,
                .transceiver    = 0,
                .ext_clock      = 0,
                .cover_only     = 0,
                .gpio_wp        = -EINVAL,
                .gpio_cd        = -EINVAL,
        },
        {}      /* Terminator */
};

MMC1 works well, but no success for MMC2.

Does someone please have pointers to documentation, apart from the 
twl4030_hsmmc_info structure header file ?

Thanks in advance.


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