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