MPC5200B MMC over SPI into PSC6

Hello, I have an embedded system with an on-board processor powerpc MPC5200B and Linux kernel 2.6.22,
I must turn over to MMC SPI on the PSC6.

First, I
have enabled PSC6:

in ../arch/ppc/platforms/lite5200.c added PSC6 in SPI mode

struct mpc52xx_psc_func mpc52xx_psc_functions[] = {
{ .id = 3,

                 .func   = "uart",
         },
         {       .id     = 4,

                 .func   = "uart",
         },
	 {       .id     = 5,

                 .func   = "spi",
         },
};

in ..
/arch/powerpc/boot/dts/lite5200b.dts enabled PSC6 in SPI mode

// PSC6 in spi mode example

		spi@2c00 {		// PSC6
			device_type = "spi";

compatible = "mpc5200b-psc-spi\0mpc5200-psc-spi";
			cell-index = <5>;
			reg = 
<2c00 100>;
			interrupts = <2 4 0>;
			interrupt-parent = <&mpc5200_pic>;
		};

Now on the menuconfig enabling these options:

$ make ARCH=powerpc 
CROSS_COMPILE=powerpc-linux-gnu- menuconfig

Platform support --->

    [*] 

MPC5200 (L25R) bugfix support
[*] Freescale Lite5200 Eval Board

Device
Drivers ---> SPI Support --->
[*] SPI support
<*> Freescale MPC52xx
PSC SPI controller

this options settings the CONFIG_SPI_MPC52xx_PSC=y variable into .config

When linux booting, if I debug ../driver/spi/mpc52xx_psc_spi.c, see that:

bus platform: add driver mpc52xx-psc-
spi

bus platform: remove driver mpc52xx-psc-spi
drivers/spi/mpc52xx_psc_spi.c:
of_register_platform_driver failed (-19)

why??
any idea??

Someone knows how
to enable mmc over spi on PSC6?

thanks Fabio Tosetto